Emerson Asco 336 Series Paralleling System Brochures And Data Sheets

2015-03-30

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Power transfer at your fingertips.

Redefining Paralleling Systems.

Revolutionary Design

Since introducing the first power transfer switch in 1920,

At the core of the 336 Paralleling System is a field

Using AC power from the generators to switch the

proven closed transition transfer switch (CTTS). This is

CTTS with the latest control system technology,

a highly reliable mechanism that studies have shown

the 336 Paralleling System can detect and recover

to have more endurance life than competitive products.

accordingly from common problems and

Incorporating advanced components into the 336

automatically start the next generator in the system.

Paralleling System help make it a superior alternative to

This design technique eliminates the need for costly

conventional circuit breaker-based systems.

and maintenance-prone lead-acid batteries often

ASCO has been committed to providing reliable technology,

Emerson Network Power - Global Headquarters
1050 Dearborn Drive
Columbus, OH 43085
Tel: +1 614 888 0246
ASCO Power Technologies - Global Headquarters
50 Hanover Road
Florham Park, NJ 07932
800-800-ASCO

found in conventional switchgear systems.

superior support and dedicated field service to satisfy power
switching and controls requirements for critical operations.
Throughout the more than 90 years of power transfer technology development, ASCO has introduced every significant
product innovation in the industry.
That leadership and commitment to innovation continues
with the 336 Paralleling System. Incorporating field-proven,
reliable technology in a patented dual operator transfer
switch mechanism, the 336 Paralleling System meets the
needs of design build projects: cost effective, reliability,
and quick delivery.
The 336 Paralleling System, available from 208 to 600
Volts, is the first transfer switch-based paralleling system
on the market. It combines robust UL approved components
in a standardized design that brings added flexibility,
reliability, and cost savings to any project.

www.EmersonNetworkPower.com/ASCO

www.ascoapu.com

A Superior Choice

Digital Link
Emerson. Consider it Solved., Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co. ©2014 Emerson Electric Co. All rights reserved.

Publication 3278

Distributed Control, No Master Control Required
3

© August, 2014

Printed in the U.S.A.

2

Feature 	

Benefit

Revolutionary CTTS-based design	

High reliability and endurance

Utilizes generator power for switching	

Eliminates costly and maintenance-prone, lead-acid batteries

Exclusive load management feature	

Maximum protection of priority one loads

Handles all generator grounding configurations	

Generators with different DC grounded schemes can be paralleled safely

Compact modular design	

Minimal configuration eliminates job-specific engineering; easy to expand

Simple operation	

Entire system starts with single contact or door control switch

Power transfer at your fingertips.

Redefining Paralleling Systems.

Revolutionary Design

Since introducing the first power transfer switch in 1920,

At the core of the 336 Paralleling System is a field

Using AC power from the generators to switch the

proven closed transition transfer switch (CTTS). This is

CTTS with the latest control system technology,

a highly reliable mechanism that studies have shown

the 336 Paralleling System can detect and recover

to have more endurance life than competitive products.

accordingly from common problems and

Incorporating advanced components into the 336

automatically start the next generator in the system.

Paralleling System help make it a superior alternative to

This design technique eliminates the need for costly

conventional circuit breaker-based systems.

and maintenance-prone lead-acid batteries often

ASCO has been committed to providing reliable technology,

Emerson Network Power - Global Headquarters
1050 Dearborn Drive
Columbus, OH 43085
Tel: +1 614 888 0246
ASCO Power Technologies - Global Headquarters
50 Hanover Road
Florham Park, NJ 07932
800-800-ASCO

found in conventional switchgear systems.

superior support and dedicated field service to satisfy power
switching and controls requirements for critical operations.
Throughout the more than 90 years of power transfer technology development, ASCO has introduced every significant
product innovation in the industry.
That leadership and commitment to innovation continues
with the 336 Paralleling System. Incorporating field-proven,
reliable technology in a patented dual operator transfer
switch mechanism, the 336 Paralleling System meets the
needs of design build projects: cost effective, reliability,
and quick delivery.
The 336 Paralleling System, available from 208 to 600
Volts, is the first transfer switch-based paralleling system
on the market. It combines robust UL approved components
in a standardized design that brings added flexibility,
reliability, and cost savings to any project.

www.EmersonNetworkPower.com/ASCO

www.ascoapu.com

A Superior Choice

Digital Link
Emerson. Consider it Solved., Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co. ©2014 Emerson Electric Co. All rights reserved.

Publication 3278

Distributed Control, No Master Control Required
3

© August, 2014

Printed in the U.S.A.

2

Feature 	

Benefit

Revolutionary CTTS-based design	

High reliability and endurance

Utilizes generator power for switching	

Eliminates costly and maintenance-prone, lead-acid batteries

Exclusive load management feature	

Maximum protection of priority one loads

Handles all generator grounding configurations	

Generators with different DC grounded schemes can be paralleled safely

Compact modular design	

Minimal configuration eliminates job-specific engineering; easy to expand

Simple operation	

Entire system starts with single contact or door control switch

Power transfer at your fingertips.

Redefining Paralleling Systems.

Revolutionary Design

Since introducing the first power transfer switch in 1920,

At the core of the 336 Paralleling System is a field

Using AC power from the generators to switch the

proven closed transition transfer switch (CTTS). This is

CTTS with the latest control system technology,

a highly reliable mechanism that studies have shown

the 336 Paralleling System can detect and recover

to have more endurance life than competitive products.

accordingly from common problems and

Incorporating advanced components into the 336

automatically start the next generator in the system.

Paralleling System help make it a superior alternative to

This design technique eliminates the need for costly

conventional circuit breaker-based systems.

and maintenance-prone lead-acid batteries often

ASCO has been committed to providing reliable technology,

Emerson Network Power - Global Headquarters
1050 Dearborn Drive
Columbus, OH 43085
Tel: +1 614 888 0246
ASCO Power Technologies - Global Headquarters
50 Hanover Road
Florham Park, NJ 07932
800-800-ASCO

found in conventional switchgear systems.

superior support and dedicated field service to satisfy power
switching and controls requirements for critical operations.
Throughout the more than 90 years of power transfer technology development, ASCO has introduced every significant
product innovation in the industry.
That leadership and commitment to innovation continues
with the 336 Paralleling System. Incorporating field-proven,
reliable technology in a patented dual operator transfer
switch mechanism, the 336 Paralleling System meets the
needs of design build projects: cost effective, reliability,
and quick delivery.
The 336 Paralleling System, available from 208 to 600
Volts, is the first transfer switch-based paralleling system
on the market. It combines robust UL approved components
in a standardized design that brings added flexibility,
reliability, and cost savings to any project.

www.EmersonNetworkPower.com/ASCO

www.ascoapu.com

A Superior Choice

Digital Link
Emerson. Consider it Solved., Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co. ©2014 Emerson Electric Co. All rights reserved.

Publication 3278

Distributed Control, No Master Control Required
3

© August, 2014

Printed in the U.S.A.

2

Feature 	

Benefit

Revolutionary CTTS-based design	

High reliability and endurance

Utilizes generator power for switching	

Eliminates costly and maintenance-prone, lead-acid batteries

Exclusive load management feature	

Maximum protection of priority one loads

Handles all generator grounding configurations	

Generators with different DC grounded schemes can be paralleled safely

Compact modular design	

Minimal configuration eliminates job-specific engineering; easy to expand

Simple operation	

Entire system starts with single contact or door control switch

336 Product Components

‘the 336 Paralleling System can detect and recover
accordingly from common problems and
automatically start the next generator in the system’

Master Control Panel

Powerful Management Tools

Parallel Dissimilar Generators

Intuitive Operation

ASCO innovation has also led to the development of a Power

If you have different brands or various models of generators

A simple control interface on the 336 Paralleling System

Management option with a robust tool set that improves

from the same manufacturer, the 336 Paralleling System is

allows the entire system to be started with a single contact

overall operation and efficiency.

perfect for you. A dissimilar generator ground configuration

or switch. Easy-to-operate fault tolerant controls, along

option – another ASCO innovation – adds components to

with ANSI protective functions, ensure the CTTS will provide

Load Management – A unique feature that allows for up to

the 336 Paralleling System so it can be integrated with any

maximum protective functions for your power system with

four levels of load control. Priority one loads are given maxi-

generator, regardless of size or manufacturer. The option

the added back-up of the generator circuit breaker for

mum protection by allowing lower priority loads (four, three,

allows generators of different DC grounding schemes to be

overcurrent faults.

and then two) to shed first. Load shedding is

paralleled.

accomplished by ASCO’s time-proven algorithms based on

High Reliability

the percentage of system load. The 336 Paralleling System
adds load based on the actual KW entered during startup
Generator Controls

Generator 1 Controller

rather than the number of generator sets in operation. This
unique approach works with any number of generators running.

Generator 2 Controller

Generator Management – The 336 Paralleling System’s

Generator 1 OIT

generator management feature will automatically start and

Generator 2 OIT

stop generators as needed to maintain a preset spinning
reserve or safety margin between the actual load consumed
and the total power available from all running generators.
This management tool saves generator maintenance costs
and reduces fuel consumption for more efficient operation.
Start Next Generator on Alarm – The 336 Paralleling

Gen 1 and Gen 2 DC
Connection AC Fuses
Priority Relays(behind door)

Generator OIT

Gen 2 CTs

Gen 2 Connections

Generator 2
Controller

Gen 1 Connections

*Note: These are all configured for 3 phase, so there is no voltage code for 120V or 277V.
1. Modularity/expandability: a 337 may be added later to a 336 system, provided the power distribution bus, if any, is done correctly. Be sure to match
options! If 336 has 160PM or 160PS, be sure to order the same options for the 337.

An Operator Interface Terminal (OIT) features 16

2. Amp Rating is either the sum of generator rated currents or rounded up to the next available rating size equal to or less than the largest generator.
Example: two 600A gensets will use a 1200 Amp Rating. Larger generators may be possible, please consult factory. Amp Rating automatically selects
frame size and CT ratio.

programmable tri-color LEDs and 8 programmable push

ASCO has incorporated a superior hub and spoke design into

buttons. The OIT features functions for off/cool down, auto

the 336 Paralleling System. This provides a added level of

mode, priority load force on, and reset load management

redundancy compared to daisy-chained systems, all of which

to auto.

means a single failure no longer results in the entire system

336 Amp Ratings

Fits in Any Application

shutting down.

The reliability, size and cost benefits make the 336 Paralleling
Redundant electrical protection in the existing generator

System perfect for a variety of environments.

circuit breaker and the 336 Paralleling System provides a
superior level of protection. A generator circuit breaker trip

Oil and Gas – The 336 Paralleling System can serve as a

coil/wire break monitoring feature monitors the circuit

Parallel Power Island (PPI) or prime power system at fracking

breaker trip coil and may be programmed for trip or alarm

and drilling sites that require temporary primary power.

of the genset.

336 Dimensions

Healthcare – Hospitals and healthcare clinics can utilize
the 336 Paralleling System as an affordable and reliable

System automatically communicates with the genset control

Easily Expandable

system to seamlessly maintain your critical loads. If a genset

The 336 Paralleling System brings an unprecedented level

drops into a warning mode, an alarm sounds and the next

of modularity and expandability to a variety of applications.

Grid Support – A perfect solution to meet demand in

priority generator is started and added to the bus, replacing

With front access options and a footprint as small as

interruptible service or peak control programs to save you

Standard Accessories compatible with 336/337: Consult factory for details.
44A (space heaters), 73 (surge arrestor), 131 (ARRA compliance certification)

the genset that caused the alarm.

28” D x 38” W, the 336 Paralleling System can be designed

money. A multi-generator 336 Paralleling System may be

into compact power generation configurations. This design

Accessories specific for 300 series products all start with 160:

Run Time Management – With this capability, generators

a more cost-efficient and redundant solution than a single

approach also requires minimal configuration in the base

can be set to automatically start and stop to control run

large generator.

unit, eliminating the need for job-specific engineering.

160PM: Power Management includes: (On 4 gen systems, must be ordered on both 336 and 337 to work properly.)
—	
4 levels of Load Management (Load Shed/Load Add), Priority 1 never sheds. Priority 2, 3, 4 loads
are managed via ASCO option 30A in load ATS’s.
—	
Bus Optimization (Gen Shed/Gen Add).
—	
Start Next Gen on Alarm.
—	
Run Time Management or Run Time Equalization.
160PS: Isolated power supplies are required for installations where the generators’ DC systems have dissimilar
grounding schemes and recommended for all installations. Consult product information for more details.
Must be ordered on both 336 and 337 products for proper operation.
160DS: Dissimilar Sized Gensets. Standard configuration is with 2 generators of the same size; order this option if the
installation has 2 different sized generators. Sums of the currents must be below the Amp Rating. Specify gen sizes
in notes.
160CD: Custom Drawings. Generic drawings are standard. For custom or “as installed” drawings, purchase this option.
161TD1: Color HMI. A 7” color touchscreen, the ASCO TDI. 1 HMI per 336. 1 HMI per 337. Preloaded with ASCO
standard screens. Each HMI will display the data for the 2 gens in that section/on that CTTS. Includes a 72EE as an
Ethernet switch. Consult product information for more details.

back up power system.

time. Settings can be established to equalize running

Generator 1
Controller

336 Ordering Information

hours or intentionally offset running hours to stagger

Utilizing a modular approach, it is easy to expand a two-

routine maintenance.

generator system to a four-unit configuration. The flexible

System Solutions – The 336 Paralleling System can be
combined with ASCO Series 300/4000/7000 Transfer
Switches and PowerQuest® Critical Power Management

design will also accommodate larger requirements with

Systems.

custom designs for customers. Additionally, UL891 distribution
circuit breakers can easily be added with a standard bus interface.

Gen 1 CTs

Oil and Gas

Healthcare

Grid Support

Master Control Panel with Optional Power Management

Cabling access:

Isolated
Power
Supplies
4

Customer Terminal Board

5

6

1200A and below: Standard is front access for connections, optional rear access.
1201A and above is always rear access.
Optional Output Distribution breakers or Load Panel(s) requests are custom engineered and quoted for the
specific project with UL891 switchgear with either UL489 or UL1066 style breakers. Contact 800-800-ASCO or
E-mail customercare@asco.com for technical questions, delivery times, and pricing.

7

336 Product Components

‘the 336 Paralleling System can detect and recover
accordingly from common problems and
automatically start the next generator in the system’

Master Control Panel

Powerful Management Tools

Parallel Dissimilar Generators

Intuitive Operation

ASCO innovation has also led to the development of a Power

If you have different brands or various models of generators

A simple control interface on the 336 Paralleling System

Management option with a robust tool set that improves

from the same manufacturer, the 336 Paralleling System is

allows the entire system to be started with a single contact

overall operation and efficiency.

perfect for you. A dissimilar generator ground configuration

or switch. Easy-to-operate fault tolerant controls, along

option – another ASCO innovation – adds components to

with ANSI protective functions, ensure the CTTS will provide

Load Management – A unique feature that allows for up to

the 336 Paralleling System so it can be integrated with any

maximum protective functions for your power system with

four levels of load control. Priority one loads are given maxi-

generator, regardless of size or manufacturer. The option

the added back-up of the generator circuit breaker for

mum protection by allowing lower priority loads (four, three,

allows generators of different DC grounding schemes to be

overcurrent faults.

and then two) to shed first. Load shedding is

paralleled.

accomplished by ASCO’s time-proven algorithms based on

High Reliability

the percentage of system load. The 336 Paralleling System
adds load based on the actual KW entered during startup
Generator Controls

Generator 1 Controller

rather than the number of generator sets in operation. This
unique approach works with any number of generators running.

Generator 2 Controller

Generator Management – The 336 Paralleling System’s

Generator 1 OIT

generator management feature will automatically start and

Generator 2 OIT

stop generators as needed to maintain a preset spinning
reserve or safety margin between the actual load consumed
and the total power available from all running generators.
This management tool saves generator maintenance costs
and reduces fuel consumption for more efficient operation.
Start Next Generator on Alarm – The 336 Paralleling

Gen 1 and Gen 2 DC
Connection AC Fuses
Priority Relays(behind door)

Generator OIT

Gen 2 CTs

Gen 2 Connections

Generator 2
Controller

Gen 1 Connections

*Note: These are all configured for 3 phase, so there is no voltage code for 120V or 277V.
1. Modularity/expandability: a 337 may be added later to a 336 system, provided the power distribution bus, if any, is done correctly. Be sure to match
options! If 336 has 160PM or 160PS, be sure to order the same options for the 337.

An Operator Interface Terminal (OIT) features 16

2. Amp Rating is either the sum of generator rated currents or rounded up to the next available rating size equal to or less than the largest generator.
Example: two 600A gensets will use a 1200 Amp Rating. Larger generators may be possible, please consult factory. Amp Rating automatically selects
frame size and CT ratio.

programmable tri-color LEDs and 8 programmable push

ASCO has incorporated a superior hub and spoke design into

buttons. The OIT features functions for off/cool down, auto

the 336 Paralleling System. This provides a added level of

mode, priority load force on, and reset load management

redundancy compared to daisy-chained systems, all of which

to auto.

means a single failure no longer results in the entire system

336 Amp Ratings

Fits in Any Application

shutting down.

The reliability, size and cost benefits make the 336 Paralleling
Redundant electrical protection in the existing generator

System perfect for a variety of environments.

circuit breaker and the 336 Paralleling System provides a
superior level of protection. A generator circuit breaker trip

Oil and Gas – The 336 Paralleling System can serve as a

coil/wire break monitoring feature monitors the circuit

Parallel Power Island (PPI) or prime power system at fracking

breaker trip coil and may be programmed for trip or alarm

and drilling sites that require temporary primary power.

of the genset.

336 Dimensions

Healthcare – Hospitals and healthcare clinics can utilize
the 336 Paralleling System as an affordable and reliable

System automatically communicates with the genset control

Easily Expandable

system to seamlessly maintain your critical loads. If a genset

The 336 Paralleling System brings an unprecedented level

drops into a warning mode, an alarm sounds and the next

of modularity and expandability to a variety of applications.

Grid Support – A perfect solution to meet demand in

priority generator is started and added to the bus, replacing

With front access options and a footprint as small as

interruptible service or peak control programs to save you

Standard Accessories compatible with 336/337: Consult factory for details.
44A (space heaters), 73 (surge arrestor), 131 (ARRA compliance certification)

the genset that caused the alarm.

28” D x 38” W, the 336 Paralleling System can be designed

money. A multi-generator 336 Paralleling System may be

into compact power generation configurations. This design

Accessories specific for 300 series products all start with 160:

Run Time Management – With this capability, generators

a more cost-efficient and redundant solution than a single

approach also requires minimal configuration in the base

can be set to automatically start and stop to control run

large generator.

unit, eliminating the need for job-specific engineering.

160PM: Power Management includes: (On 4 gen systems, must be ordered on both 336 and 337 to work properly.)
—	
4 levels of Load Management (Load Shed/Load Add), Priority 1 never sheds. Priority 2, 3, 4 loads
are managed via ASCO option 30A in load ATS’s.
—	
Bus Optimization (Gen Shed/Gen Add).
—	
Start Next Gen on Alarm.
—	
Run Time Management or Run Time Equalization.
160PS: Isolated power supplies are required for installations where the generators’ DC systems have dissimilar
grounding schemes and recommended for all installations. Consult product information for more details.
Must be ordered on both 336 and 337 products for proper operation.
160DS: Dissimilar Sized Gensets. Standard configuration is with 2 generators of the same size; order this option if the
installation has 2 different sized generators. Sums of the currents must be below the Amp Rating. Specify gen sizes
in notes.
160CD: Custom Drawings. Generic drawings are standard. For custom or “as installed” drawings, purchase this option.
161TD1: Color HMI. A 7” color touchscreen, the ASCO TDI. 1 HMI per 336. 1 HMI per 337. Preloaded with ASCO
standard screens. Each HMI will display the data for the 2 gens in that section/on that CTTS. Includes a 72EE as an
Ethernet switch. Consult product information for more details.

back up power system.

time. Settings can be established to equalize running

Generator 1
Controller

336 Ordering Information

hours or intentionally offset running hours to stagger

Utilizing a modular approach, it is easy to expand a two-

routine maintenance.

generator system to a four-unit configuration. The flexible

System Solutions – The 336 Paralleling System can be
combined with ASCO Series 300/4000/7000 Transfer
Switches and PowerQuest® Critical Power Management

design will also accommodate larger requirements with

Systems.

custom designs for customers. Additionally, UL891 distribution
circuit breakers can easily be added with a standard bus interface.

Gen 1 CTs

Oil and Gas

Healthcare

Grid Support

Master Control Panel with Optional Power Management

Cabling access:

Isolated
Power
Supplies
4

Customer Terminal Board

5

6

1200A and below: Standard is front access for connections, optional rear access.
1201A and above is always rear access.
Optional Output Distribution breakers or Load Panel(s) requests are custom engineered and quoted for the
specific project with UL891 switchgear with either UL489 or UL1066 style breakers. Contact 800-800-ASCO or
E-mail customercare@asco.com for technical questions, delivery times, and pricing.

7

336 Product Components

‘the 336 Paralleling System can detect and recover
accordingly from common problems and
automatically start the next generator in the system’

Master Control Panel

Powerful Management Tools

Parallel Dissimilar Generators

Intuitive Operation

ASCO innovation has also led to the development of a Power

If you have different brands or various models of generators

A simple control interface on the 336 Paralleling System

Management option with a robust tool set that improves

from the same manufacturer, the 336 Paralleling System is

allows the entire system to be started with a single contact

overall operation and efficiency.

perfect for you. A dissimilar generator ground configuration

or switch. Easy-to-operate fault tolerant controls, along

option – another ASCO innovation – adds components to

with ANSI protective functions, ensure the CTTS will provide

Load Management – A unique feature that allows for up to

the 336 Paralleling System so it can be integrated with any

maximum protective functions for your power system with

four levels of load control. Priority one loads are given maxi-

generator, regardless of size or manufacturer. The option

the added back-up of the generator circuit breaker for

mum protection by allowing lower priority loads (four, three,

allows generators of different DC grounding schemes to be

overcurrent faults.

and then two) to shed first. Load shedding is

paralleled.

accomplished by ASCO’s time-proven algorithms based on

High Reliability

the percentage of system load. The 336 Paralleling System
adds load based on the actual KW entered during startup
Generator Controls

Generator 1 Controller

rather than the number of generator sets in operation. This
unique approach works with any number of generators running.

Generator 2 Controller

Generator Management – The 336 Paralleling System’s

Generator 1 OIT

generator management feature will automatically start and

Generator 2 OIT

stop generators as needed to maintain a preset spinning
reserve or safety margin between the actual load consumed
and the total power available from all running generators.
This management tool saves generator maintenance costs
and reduces fuel consumption for more efficient operation.
Start Next Generator on Alarm – The 336 Paralleling

Gen 1 and Gen 2 DC
Connection AC Fuses
Priority Relays(behind door)

Generator OIT

Gen 2 CTs

Gen 2 Connections

Generator 2
Controller

Gen 1 Connections

*Note: These are all configured for 3 phase, so there is no voltage code for 120V or 277V.
1. Modularity/expandability: a 337 may be added later to a 336 system, provided the power distribution bus, if any, is done correctly. Be sure to match
options! If 336 has 160PM or 160PS, be sure to order the same options for the 337.

An Operator Interface Terminal (OIT) features 16

2. Amp Rating is either the sum of generator rated currents or rounded up to the next available rating size equal to or less than the largest generator.
Example: two 600A gensets will use a 1200 Amp Rating. Larger generators may be possible, please consult factory. Amp Rating automatically selects
frame size and CT ratio.

programmable tri-color LEDs and 8 programmable push

ASCO has incorporated a superior hub and spoke design into

buttons. The OIT features functions for off/cool down, auto

the 336 Paralleling System. This provides a added level of

mode, priority load force on, and reset load management

redundancy compared to daisy-chained systems, all of which

to auto.

means a single failure no longer results in the entire system

336 Amp Ratings

Fits in Any Application

shutting down.

The reliability, size and cost benefits make the 336 Paralleling
Redundant electrical protection in the existing generator

System perfect for a variety of environments.

circuit breaker and the 336 Paralleling System provides a
superior level of protection. A generator circuit breaker trip

Oil and Gas – The 336 Paralleling System can serve as a

coil/wire break monitoring feature monitors the circuit

Parallel Power Island (PPI) or prime power system at fracking

breaker trip coil and may be programmed for trip or alarm

and drilling sites that require temporary primary power.

of the genset.

336 Dimensions

Healthcare – Hospitals and healthcare clinics can utilize
the 336 Paralleling System as an affordable and reliable

System automatically communicates with the genset control

Easily Expandable

system to seamlessly maintain your critical loads. If a genset

The 336 Paralleling System brings an unprecedented level

drops into a warning mode, an alarm sounds and the next

of modularity and expandability to a variety of applications.

Grid Support – A perfect solution to meet demand in

priority generator is started and added to the bus, replacing

With front access options and a footprint as small as

interruptible service or peak control programs to save you

Standard Accessories compatible with 336/337: Consult factory for details.
44A (space heaters), 73 (surge arrestor), 131 (ARRA compliance certification)

the genset that caused the alarm.

28” D x 38” W, the 336 Paralleling System can be designed

money. A multi-generator 336 Paralleling System may be

into compact power generation configurations. This design

Accessories specific for 300 series products all start with 160:

Run Time Management – With this capability, generators

a more cost-efficient and redundant solution than a single

approach also requires minimal configuration in the base

can be set to automatically start and stop to control run

large generator.

unit, eliminating the need for job-specific engineering.

160PM: Power Management includes: (On 4 gen systems, must be ordered on both 336 and 337 to work properly.)
—	
4 levels of Load Management (Load Shed/Load Add), Priority 1 never sheds. Priority 2, 3, 4 loads
are managed via ASCO option 30A in load ATS’s.
—	
Bus Optimization (Gen Shed/Gen Add).
—	
Start Next Gen on Alarm.
—	
Run Time Management or Run Time Equalization.
160PS: Isolated power supplies are required for installations where the generators’ DC systems have dissimilar
grounding schemes and recommended for all installations. Consult product information for more details.
Must be ordered on both 336 and 337 products for proper operation.
160DS: Dissimilar Sized Gensets. Standard configuration is with 2 generators of the same size; order this option if the
installation has 2 different sized generators. Sums of the currents must be below the Amp Rating. Specify gen sizes
in notes.
160CD: Custom Drawings. Generic drawings are standard. For custom or “as installed” drawings, purchase this option.
161TD1: Color HMI. A 7” color touchscreen, the ASCO TDI. 1 HMI per 336. 1 HMI per 337. Preloaded with ASCO
standard screens. Each HMI will display the data for the 2 gens in that section/on that CTTS. Includes a 72EE as an
Ethernet switch. Consult product information for more details.

back up power system.

time. Settings can be established to equalize running

Generator 1
Controller

336 Ordering Information

hours or intentionally offset running hours to stagger

Utilizing a modular approach, it is easy to expand a two-

routine maintenance.

generator system to a four-unit configuration. The flexible

System Solutions – The 336 Paralleling System can be
combined with ASCO Series 300/4000/7000 Transfer
Switches and PowerQuest® Critical Power Management

design will also accommodate larger requirements with

Systems.

custom designs for customers. Additionally, UL891 distribution
circuit breakers can easily be added with a standard bus interface.

Gen 1 CTs

Oil and Gas

Healthcare

Grid Support

Master Control Panel with Optional Power Management

Cabling access:

Isolated
Power
Supplies
4

Customer Terminal Board

5

6

1200A and below: Standard is front access for connections, optional rear access.
1201A and above is always rear access.
Optional Output Distribution breakers or Load Panel(s) requests are custom engineered and quoted for the
specific project with UL891 switchgear with either UL489 or UL1066 style breakers. Contact 800-800-ASCO or
E-mail customercare@asco.com for technical questions, delivery times, and pricing.

7

336 Ordering Information

*Note: These are all configured for 3 phase, so there is no voltage code for 120V or 277V.
1. Modularity/expandability: a 337 may be added later to a 336 system, provided the power distribution bus, if any, is done correctly. Be sure to match
options! If 336 has 160PM or 160PS, be sure to order the same options for the 337.
2. Amp Rating is either the sum of generator rated currents rounded up to the next available rating size or equal to or less than the largest generator.
Example: two 600A gensets will use a 1200 Amp Rating. Larger generators may be possible, please consult factory. Amp Rating automatically selects
frame size in a cumulative configuration CT ratio.

336 Amp Ratings

336 Dimensions

Standard Accessories compatible with 336/337: Consult factory for details.
44A (space heaters), 73 (surge arrestor), 131 (ARRA compliance certification)
Accessories specific for 300 series products all start with 160:
160PM: Power Management includes: (On 4 gen systems, must be ordered on both 336 and 337 to work properly.)
—	
4 levels of Load Management (Load Shed/Load Add), Priority 1 never sheds. Priority 2, 3, 4 loads
are managed via ASCO option 30A in load ATS’s.
—	
Bus Optimization (Gen Shed/Gen Add).
—	
Start Next Gen on Alarm.
—	
Run Time Management or Run Time Equalization.
160PS: Isolated power supplies are required for installations where the generators’ DC systems have dissimilar
grounding schemes and recommended for all installations. Consult product information for more details.
Must be ordered on both 336 and 337 products for proper operation.
160DS: Dissimilar Sized Gensets. Standard configuration is with 2 generators of the same size; order this option if the
installation has 2 different sized generators. Sums of the currents must be below the Amp Rating. Specify gen sizes
in notes.
160CD: Custom Drawings. Generic drawings are standard. For custom or “as installed” drawings, purchase this option.
161TD1: Color HMI. A 7” color touchscreen, the ASCO TDI. 1 HMI per 336. 1 HMI per 337. Preloaded with ASCO
standard screens. Each HMI will display the data for the 2 gens in that section/on that CTTS. Includes a 72EE as an
Ethernet switch. Consult product information for more details.
160LU: For special lugs

Cabling access:
1200A and below: Standard is front access for connections, optional rear access.
1201A and above is always rear access.
Optional Output Distribution breakers or Load Panel(s) requests are custom engineered and quoted for the
specific project with UL891 switchgear with either UL489 or UL1066 style breakers. Contact 800-800-ASCO or
E-mail customercare@asco.com for technical questions, delivery times, and pricing.

7

Power transfer at your fingertips.

Redefining Paralleling Systems.

Revolutionary Design

Since introducing the first power transfer switch in 1920,

At the core of the 336 Paralleling System is a field

Using AC power from the generators to switch the

proven closed transition transfer switch (CTTS). This is

CTTS with the latest control system technology,

a highly reliable mechanism that studies have shown

the 336 Paralleling System can detect and recover

to have more endurance life than competitive products.

accordingly from common problems and

Incorporating advanced components into the 336

automatically start the next generator in the system.

Paralleling System help make it a superior alternative to

This design technique eliminates the need for costly

conventional circuit breaker-based systems.

and maintenance-prone lead-acid batteries often

ASCO has been committed to providing reliable technology,

Emerson Network Power - Global Headquarters
1050 Dearborn Drive
Columbus, OH 43085
Tel: +1 614 888 0246
ASCO Power Technologies - Global Headquarters
50 Hanover Road
Florham Park, NJ 07932
800-800-ASCO

found in conventional switchgear systems.

superior support and dedicated field service to satisfy power
switching and controls requirements for critical operations.
Throughout the more than 90 years of power transfer technology development, ASCO has introduced every significant
product innovation in the industry.
That leadership and commitment to innovation continues
with the 336 Paralleling System. Incorporating field-proven,
reliable technology in a patented dual operator transfer
switch mechanism, the 336 Paralleling System meets the
needs of design build projects: cost effective, reliability,
and quick delivery.
The 336 Paralleling System, available from 208 to 600
Volts, is the first transfer switch-based paralleling system
on the market. It combines robust UL approved components
in a standardized design that brings added flexibility,
reliability, and cost savings to any project.

www.EmersonNetworkPower.com/ASCO

www.ascoapu.com

A Superior Choice

Digital Link
Emerson. Consider it Solved., Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co. ©2014 Emerson Electric Co. All rights reserved.

Publication 3278

Distributed Control, No Master Control Required
3

© August, 2014

Printed in the U.S.A.

2

Feature 	

Benefit

Revolutionary CTTS-based design	

High reliability and endurance

Utilizes generator power for switching	

Eliminates costly and maintenance-prone, lead-acid batteries

Exclusive load management feature	

Maximum protection of priority one loads

Handles all generator grounding configurations	

Generators with different DC grounded schemes can be paralleled safely

Compact modular design	

Minimal configuration eliminates job-specific engineering; easy to expand

Simple operation	

Entire system starts with single contact or door control switch



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