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Data Bulletin 0600DB0002R08/11

09/2011

Replaces 0600DB0002R06/11, 07/2011

GC-200 Ground-Fault Relay System with GC2DSP Display

Class 600

Introduction The GC-200 Ground-Fault Relay System protects a distribution system from

low-level ground faults and arcing faults, which conventional circuit breakers

and fuses often cannot detect until serious damage has been done. It is

estimated that approximately 80–85% of all faults begin as ground faults.

Ground faults are unintentional current paths to the system ground,

frequently due to reduced insulation or physical damage to insulation. They

may occur in main, feeder, or branch circuits. If they are not detected and

corrected, ground faults can lead to equipment damage or injury to

personnel.

Additional References Bulletin 48049-212-05 Instruction bulletin for GC-200 Ground Fault Relay

Bulletin S1A43091 Instructions for GC2DSP Display

Bulletin 0600DB0001 Reducing Fault Stress with Zone-Selective Interlocking

Ground-Fault System A typical ground-fault protection system (Figure 1) includes the following

(the relay, display, and sensors are described in greater detail later in this

bulletin):

•a ground-fault sensor (current transformer) installed around all phases

and neutral (the selection of toroid or open-frame models available from

Schneider Electric™ is discussed later);

•a GC-200 Ground-Fault Relay to detect ground-fault current (three pick-

up ranges are available, as specified in Table 1);

•a disconnect device such as a circuit breaker with shunt trip or a bolted

pressure switch with trip solenoid to open the circuit on which the ground

fault is detected (this can be existing hardware or a new device installed

in conjunction with the GC-200 relay);

•a GC2DSP Ground-Fault Display and cables (optional);

•an optional restraint interface module (RIM) when using zone-selective

interlocking (ZSI) with other devices (for more information on ZSI see

data bulletin 0600DB0001, “Reducing Fault Stress with Zone-selective

Interlocking”).

The GC-200 product line includes three models of relays with pickup

settings ranging from 3 A to 1200 A to provide low-level or high-level

ground-fault detection for several purposes:

•to meet National Electrical Code (NEC) requirements for ground-fault

protection of main service over 150 volts and 1000 A or more;

•to avoid shutting down an entire facility when only a feeder or branch

circuit breaker has a ground fault; and

•to better protect sensitive equipment located far downstream of the main

circuit breaker.

Typical applications of ground-fault relays include manufacturing,

refrigeration, mining, and fire protection; they can be found in utility stations

and substations, steel and aluminum mills, malls and stores, and on

construction sites.

Figure 1: A Typical Ground-Fault

Protection System

Switch

Sensor (CT)

Protected Line

Circuit

Breaker or

Switch

GC-200

Relay

GC-200

Display

09003002

GC-200 Ground-Fault Relay System with GC2DSP Display 0600DB0002R08/11

Equipment Ground-Fault Protection 09/2011

Equipment Ground-Fault

Protection

Equipment ground-fault protection is a subject that is often overlooked when

designing a protection scheme for an electrical system. Often, the only

question asked is, “Does the NEC require it?” However, the minimum NEC

requirements specify only that “ground-fault protection of equipment [be]

provided for solidly grounded wye electrical services of more than 150 volts

to ground, but not exceeding 600 volts phase-to-phase for each service

disconnect rated 1000 amperes or more” (NEC 230-95, 215-10, 240-13).

The real question that should be asked when specifying a circuit breaker for

overcurrent protection is, “Wouldn’t one also need ground-fault protection to

protect equipment against the most common of all faults?”

A common rationale for not applying ground-fault relays is, “The overcurrent

devices will take out the fault.” However, this is not necessarily true in the

case of an arcing fault, which may have a current level below the

overcurrent pickup level.

Ground-Fault protection is recommended at more levels than the minimum

required by the NEC for these reasons:

•to avoid shutting down an entire facility when only a branch or feeder

circuit breaker has a ground fault;

•to protect equipment located far downstream of the main circuit breaker;

•to supplement normal overcurrent protection—it is estimated that

80–85% of faults begin as ground faults.

The GC-200 relay and peripheral equipment are suitable for the following

solidly-grounded electrical environments:

•any low-voltage power distribution system, from main circuit breakers to

downstream locations

•single-phase and three-phase 50/60 Hz

•industrial and commercial installations

Providing coordinated ground-fault protection at the feeder and branch

circuit breaker levels can minimize the costs of having a production

shutdown because of an isolated ground fault at a feeder or branch circuit

breaker level.

Costs of troubleshooting and replacing damaged circuits or equipment due

to sustained, arcing, low-level ground faults can be minimized with a

comprehensive ground-fault detection and protection system.

0600DB0002R08/11 GC-200 Ground-Fault Relay System with GC2DSP Display

09/2011 GC-200 Ground-Fault Relay

GC-200 Ground-Fault Relay The heart of the GC-200 Ground-Fault Relay System is the GC-200

Ground-Fault Relay. The relay receives the zero-sequence signal

(composite of phases A, B, C, and Neutral) from the sensor and compares it

to its pickup settings. If a ground-fault occurs, the relay operates its output

contacts to cause an associated switch or circuit breaker to interrupt the

faulted circuit (or alarm only, if so implemented).

The product line includes three models to cover the range from low-level

branch circuit breakers to high-level feeder or main circuit breakers, with

pickup settings from 3 A up to 1200 A, as listed in Table 1. Each model has

ten switch-selectable pickup settings within its range. The pickup settings in

the GC-200D and GC-200E relays can be further fine-tuned by using the

GC2DSP display (in increments of 1 A for the 200D and 10 A for the 200 E).

Key features of the relay include:

•adjustable ground-fault current pickup (up to ten levels)

•time delay switch with instantaneous setting, four fixed-time delay

settings, and four inverse I2t time delay settings

•two output contacts: 10 A Form A for disconnect of faulted circuit and

5 A Form C for alarm signal

•zone-selective interlocking (ZSI) for optimizing the response of

coordinated circuit breakers and/or relays at other levels

•current sensors, including toroid (some with split core) and rectangular

window current transformers (some with open frame)

•an optional GC2DSP display with LCD for viewing magnitude of ground-

fault currents and setting of parameters

•120 Vac and/or 24 Vdc power supply to provide flexibility

•DIN rail mounting of compact enclosure

•compact design

•full compatibility with Square D by Schneider Electric circuit breakers with

Micrologic™ trip units (see Page 7)

The GC-200 Ground-Fault System is the culmination of years of experience

in ground-fault protection by Schneider Electric™.

The GC-200 Ground-Fault Relay is the latest addition to a family of

Schneider Electric™ products used to satisfy the need for equipment

ground-fault protection. These products include:

•HOM-GFI Homeline™ ground-fault interrupter

•QO-GFI ground-fault interrupter

•QO-EPD and HOM-EPD equipment protection devices

•Type GA Ground-Censor™

•Micrologic™ circuit breakers

•Micrologic add-on ground-fault modules

•Masterpact™ circuit breakers with electronic trip units, with options for

ZSI and a neutral transformer

Figure 2: GC-200 Ground-Fault Relay

Table 1: Relay Catalog Numbers and Applications

Catalog

Number

Pickup

Range (A) Pickup Settings (A) Typical

Load (A) Delay Range Application

GC-200C 3.0–30.0 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 1000–3000

Instantaneous,

0.1, 0.2, 0.3, 0.4 sec.

(Fixed and inverse)

Branch circuit protection for motors or for coordination

with upstream ground fault relays

GC-200D 30.0–300.0 30, 90, 90, 120, 150, 180, 210,

240, 270, 300 1000–3000 Same as above Feeder circuits, cable protection, and to coordinate

with mains

GC-200E 120.0–1200.0 120, 240, 360, 480, 600, 720,

840, 960, 1080, 1200 3000–6000 Same as above Main circuits per NEC

GC-200 Ground-Fault Relay System with GC2DSP Display 0600DB0002R08/11

GC-200 Ground-Fault Relay 09/2011

Indicator Lights The front panel of the GC-200 relay has three indicating lights to show status:

•Power (A): Green LED indicates relay is powered

•Restrained (B): Yellow LED indicates the relay is receiving a restraint signal

from a downstream relay or a Micrologic trip unit or is self-restrained

•Tripped (C): Red LED indicates relay has tripped on a ground fault

The Restrained light is used in conjunction with the ZSI test push button to

verify ZSI wiring in the field. If the wiring is intact, operation of a downstream

ZSI test button will cause the first upstream relay to indicate Restrained.

Reset Functions The relay may be reset in four ways:

•by pressing the Reset button on the front of the GC-200 relay;

•by interrupting the control power to the relay;

•externally, by using a remote normally open (NO) push-button switch

wired to the Reset input terminals of the relay; or

•by pressing the OK to Reset button on the GC2DSP display.

Auxiliary Trip The GC-200 relay can be used by other devices to interrupt the load current

by means of the Auxiliary Input terminals. For example, an external device

such as a Programmable Logic Controller output could apply a 120 Vac

signal to cause an immediate trip of the relay and the associated switch or

circuit breaker.

Figure 3: GC-200 Indicator Lights

09313074

Assembled in USA

Ensamblado en los EUA

Assemblé aux É.-U.

Alimentación

Restringido

Disparado

Prueba de ZSI

Restablecimiento

Power

Puissance

Restrained

Restreint

Tripped

Declenché

ZSI Test

Reset

Reármement

For use with copper wire only.

Para usarse con conductores de cobre solamente.

Utilisation avec fils de cuivre seulement.

Pickup (A)

Activación (A)

Seuil (A)

Delay (Sec)

Retard (Sec)

Retardo (Seg) Relevador de falla a tierra

Ground-fault Relay

Relais de défaut à la terre

See Instruction bulletin 48049-212 for approved sensors. / Consulte el boletín 48049-212 para obtener información

información sobre los sensores aprobados. / Réferer au manuel d’instruction 48049-212 pour les détecteurs homopolaire approuvés.

0600DB0002R08/11 GC-200 Ground-Fault Relay System with GC2DSP Display

09/2011 GC2DSP Ground-Fault Display

GC2DSP Ground-Fault

Display

The optional GC2DSP Ground-Fault Display is a versatile unit that provides

a local or remote alphanumeric read-out of the relay settings. The display

allows adjustment of the pickup settings on the GC-200D and GC-200E

models in smaller increments—for more accurate coordination—than the

selector switch alone on the GC-200 relay allow.

Use the GC2DSP to:

•Configure parameters for the GC-200 Series 2 Relay.

•Display information about the GC-200 Relay configuration and

operation.

•Monitor ground fault trips detected by the GC-200 Relay.

•Control the GC-200 Relay remotely.

The display screen is continuously backlit. Contrast and brightness is

adjustable by using the Service menu.

The GC2DSP display connects to the GC-200 relay using a cable with RJ45

connectors on each end.

Cables are available in three lengths:

•1 m (3.28 ft)

•3 m (9.84 ft)

•5 m (16.4 ft)

•10 m (32.8 ft)

The GC-200 relays can be used as stand-alone units without the display in

cost-sensitive applications.

Additional GC2DSP features include:

•remote testing of ground-fault relay, with or without circuit breaker

operation;

•a trip test to activate the trip indicator, auxiliary relay, and, if selected,

tripping relay;

•remote resetting of the ground-fault relay;

•English, Spanish, or French display—user selects;

•surface-mountable option

•Powered from the GC-200 relay.

Figure 4: GC2DSP Ground-Fault Display

GC-200 Ground-Fault Relay System with GC2DSP Display 0600DB0002R08/11

Sensors 09/2011

Sensors A variety of current transformers (CTs) may be used as sensors, including

rectangular window CTs with open frame or toroids for smaller conductors.

All phases and neutral conductors (but not ground) of the line being

protected must pass through the sensor in order to provide the zero-

sequence sensing required by the GC-200 relay. Sensors available from

Schneider Electric™ include those in Table 2.

The test circuit inputs of these sensors allow injection of test signals to

simulate ground faults and diagnose the system. The test signals may be

obtained from a temporary test set or a permanent test setup including a

control transformer and push button.

Figure 5: Sensors

Toroid Sensor (T3B) Rectangular Sensor (GT-Series)

Table 2: Sensors for GC-200 Ground-Fault Relays

Relay

Cat. No.

Sensor

Cat. No.

Sensor

Type

Ratio Sensitivity

Overall

Length

Overall

Width Thickness Actual Window

Length or Dia.

Actual Window

Width

in. (mm) in. (mm) in. (mm) in. (mm) in. (mm)

GC-200C

GC-200D

T2A

T3A

T3A-S

T6A

T6A-S

T9A

Toroid

Toroid, split-core

Toroid

Toroid, split-core

Toroid

1000:1

200 mA to

1200 A

4.1 (104)

5.3 (135)

5.6 (142)

8.3 (211)

8.6 (218)

12.0 (305)

4.1 (104)

5.3 (135)

7.5 (191)

8.4 (213)

9.8 (249)

12.0 (305)

1.8 (46)

2.0 (51)

1.5 (38)

2.0 (51)

1.875 (48) Dia.

2.75 (70) Dia.

2.625 (67) Dia.

5.75 (146) Dia.

8.75 (222) Dia.

—

R7-13A

R4-17A

R8-26A

Rectangular

1000:1

200 mA to

1200 A

17.0 (432)

20.8 (528)

30.3 9770

12.0 (305)

7.5 (191)

13.1 (333)

2.0 (51)

2.3 (58)

13.5 (343)

17.6 (447)

26.5 (673)

7.5 (191)

4.25 (108)

8.0 (203)

GC-200E

All “A”-type

sensors above,

plus:

See above

Usable Window

Length1

1NOTE: Usable window length and width dimensions deduct 1 in. (25.4 mm) on each side of the actual window length or width dimension

Usable

Window Width1

in. (mm) in. (mm)

RZ 5-11

RZ 5-21

RZ 5-31

RZ 5-35

Rectangular,

open frame

1000:1

100 A to

1200 A

15.4 (391)

25.4 (645)

35.4 (899)

37.0 (940)

9.5 (241)

2.9 (74)

1.8 (48)

9.0 (229)

19.0 (483)

29.0 (737)

33.0 (838)

2.5 (64)

RZ 10-11

RZ 10-21

RZ 10-31

Rectangular,

open frame

600:1

100 A to

1200 A

15.4 (391)

23.0 (584)

35.4 (899)

15.5 (394)

2.9 (74)

9.0 (229)

19.0 (483)

29.0 (737)

2.5 (64)

8.5 (216)

GT-912

GT-918

GT-930

GT-1218

GT-1224

GT-1230

GT-1327

GT-1330

GT-1530

Rectangular,

open frame

600:1

100 A to

1200 A

16.3 (414)

22.3 (566)

34.3 (871)

22.3 (566)

28.3 (719)

34.3 (871)

31.3 (795)

34.3 (871)

13.0 (330)

16.0 (406)

15.2 (386)

19.0 (483)

3.0 (76)

2.8 (71)

3.0 (76)

8.5 (216)

14.5 (368)

26.5 (673)

14.5 (368)

20.5 (521)

26.5 (673)

24.0 (610)

27.0 (686)

26.0 (660)

8.5 (216)

5.5 (140)

8.5 (216)

9.5 (241)

11.0 (279)

0600DB0002R08/11 GC-200 Ground-Fault Relay System with GC2DSP Display

09/2011 System Implementation

System Implementation When designing a ground-fault protection system, consideration must be

given to two conflicting requirements, namely, maximizing the continuity of

service in as much of the system as possible, yet minimizing potential

damage to equipment from thermal stress. The GC-200 system allows this

optimization.

The first requirement can be provided by coordination of the ground-fault

protection scheme. Coordination involves setting longer time delays and

higher fault current pickups on upstream devices so as to allow downstream

devices to trip first, thus localizing the interruption of service at the lowest

level possible. The GC-200 allows fine tuning of the pickup and delay

settings to allow greater flexibility in coordination with both upstream and

downstream devices. See Figure 6.

The second requirement can be provided by using the ZSI feature of the

GC-200 relays. ZSI allows a relay detecting a ground fault to send a ZSI

signal to other relays or circuit breakers at higher levels, causing them to

restrain from tripping until the fault duration exceeds their time delay

settings. The relay at the lowest level detecting a fault will not receive a ZSI

signal and therefore will operate without intentional delay (instantaneous).

This clears the fault at the lowest level possible (minimizing the scope of the

outage) and in the shortest time possible (minimizing the stress on the

power system). See Figure 7.

The ZSI signals of the GC-200 relay are compatible with PG, PJ, PL, RG,

RJ, RL, and Masterpact™ circuit breakers with Micrologic™ series 5.0 A trip

units and higher and other GC-200 relays. For other signal levels, large

quantities of devices or long signal wiring, an optional S48890 or S48895

Restraint Interface Module (RIM) may be required. For more information on

ZSI see data bulletin 0600DB0001, “Reducing Fault Stress with Zone-

selective Interlocking.”

A need to set up the relay for an alarm only (but not protection), may be

encountered in situations where an automatic shutdown would introduce

additional hazards and therefore an operator must make the shutdown

decision (for example, continuous industrial processes or a fire pump

circuit).

Figure 6: Coordination of Multiple Levels

of Ground-Fault Protection

Source

GC-200E

Relay

600 A

0.4 sec.

Delay

GC-200D Relay

150 A

0.3 sec. Delay

GC-200D Relay

150 A

0.3 sec. Delay

GC-200C Relay

3.0 A

0.1 sec. Delay

GC-200C Relay

3.0 A

0.1 sec. Delay

Main

Load

Branch

Feeder

06023000

Figure 7: ZSI in a Coordinated System of Ground-Fault Relays and

Circuit Breakers

Circuit Breaker

or Switch

GC-200E Relay

600 A

0.4 sec. Delay

Source

ZSI In

ZSI Out

ZSI In

ZSI Out

GC-200D Relay

150 A

0.3 sec. Delay

Circuit Breaker

or Switch

Circuit Breaker

or Switch

Circuit Breaker

or Switch

Circuit Breaker

or Switch

GC-200C Relay

3.0 A

0.1 sec. Delay

Main

Feeder Branch

Self-restrained

09003001

GC-200 Ground-Fault Relay System with GC2DSP Display 0600DB0002R08/11

Applications of Ground-Fault Protection 09/2011

Applications of Ground-Fault

Protection

In many applications, the GC-200 relay should be applied for multi-zone

protection and not just for main circuit breaker protection. The relay is

intended to protect against arcing ground faults, which can not necessarily

be detected with overcurrent circuit breakers and fuses until serious

damage has been done.

NOTE: The GC-200 Ground-Fault Relay may be used if the application

requires one or more of the following:

— equipment protection, including motors, transformers, cables, and

bus duct;

— ground-fault protection at any level—main, feeder, or branch circuit

breakers;

— self-protection of the substation, switchboard, or distribution system

from damage caused by arcing ground faults;

— a ground-fault alarm for emergency systems, per the NEC; or

— coordinated ground-fault protection to avoid nuisance tripping at a

level upstream of the ground fault.

NOTE: Do NOT use the GC-200 Ground-Fault Relay if any of the

following apply:

— a shunt trip can not be added to existing circuit breaker or switch;

— the thermal-magnetic circuit breaker includes ground-fault

protection;

— people protection (4-6 mA, per UL) is required; or

— the NEC or another code disallows it—for example, emergency

supplies, U.S. Coast Guard vessels, etc.

NOTE: The GC-200 Ground-Fault Relay may NOT be needed if any of the

following apply:

— the electronic trip circuit breaker includes a ground-fault function;

— the electronic trip circuit breaker can have ground-fault option added

economically;

— the user is content to allow the main circuit breaker to trip on a

ground-fault at the feeder or branch level (nuisance tripping); or

— the user is content to allow extensive damage at lower levels due to

high trip level at a main circuit breaker.

0600DB0002R08/11 GC-200 Ground-Fault Relay System with GC2DSP Display

09/2011 Replacing a GC-100 Ground-Fault Relay with a GC-200 Ground-Fault Relay

Replacing a GC-100 Ground-

Fault Relay with a GC-200

Ground-Fault Relay

The GC-200 Ground-Fault Relay meets or exceeds all of the functional

specifications of its predecessor, the GC-100 Ground-Fault Relay. Thus the

GC-200 relay can be used as a replacement for the GC-100 relay, but with

the following considerations:

1. Mounting Space: the GC-200 relay is 6.4 in (162.56 mm) wide and 3.54

in. (89.916 mm) high; the GC-100 relay is 5.6 in. (142.24 mm) wide and

9.6 in. (243.84 mm) high. If horizontal space is limited, the GC-200 relay

can be rotated 90 degrees.

2. Mounting of Relay: The GC-200 relay mounts on a 35 mm DIN rail.

The rail requires different mounting holes than the GC-100 relay.

3. Connections: Refer to the wiring diagrams for the new GC-200 relay

and the old GC-100 relay before proceeding with wiring.

4. Monitor Module: The existing test and reset buttons may be used for

those functions of the GC-200 relay, except they will not allow a test

without tripping.

NOTE: The GC2DSP Display provides a test of the relay electronics in

either “no trip test” or “trip test” modes.

5. ZSI: The ZSI function of the GC-200 relay is not compatible with the GC-

100 relay and other devices linked to it. The GC-200 can be used only

by adding an S48890 or S48895 RIM to provide compatible interface

with existing devices.

6. GC2DSP Display: This provides functions not available in the GC-100

relay. These functions can be added to the GC-200 relay with this

optional display.

Figure 8: Ground-Fault Relays

GC-100 Ground-Fault Relay GC-200 Ground-Fault Relay

(DIN Rail Mounted)

GC-200 Ground-Fault Relay System with GC2DSP Display 0600DB0002R08/11

Specifications 09/2011

Specifications

GC-200 Relay Wiring

Table 3: Specifications

Pickup Range (A) Three models covering range from 3 A to 1200 A; see Table 1

Time Delay Settings Instantaneous plus both fixed and inverse I2t time delays of 0.1, 0.2, 0.3, and 0.4 sec.

Output Contacts Main trip 10 A @ 120 V resistive, Form A

Alarm contacts 5 A @120 V resistive, Form C

Sensors 1000:1 CT, 600:1 CT, or 700:1 CT; or modified differential ground-fault (MDGF) input

Inputs Auxiliary trip input 120 Vac operating

Pickup Accuracy: ± 10%

Metering Accuracy 10% of IG + one digit

Max. IG Accuracy 10%

Maximum Readings GC-200C 999.9 A

GC-200D and GC-200E 9999 A

ZSI Signals See page 7 for compatibility details.

Power Requirements 120 Vac (+20/-45%) or 24 Vdc; 15 W

Frequency of Operation 50/60 Hz

Temperature Operating Range

GC-200 relay -31°F to 176°F (-35°C to +80°C)

GC2DSP display Inside cabinet: -4°F to 140°F (-20 to + 60°C)

Outside cabinet: -4°F to 131°F (-20 to +55°C)

Dimensions:

in. (mm)

GC-200 Relay 6.3 (160.0) W x 3.54 (89.9) H x 57.4 (2.28) D; 35 mm DIN rail-mountable

GC2DSP Display 4.67 (117) W x 2.76 (70) H x 2.19 (55) D

Sensor Variable (NOTE: Table 2 on page 6 provides overall dimensions and window size dimensions for conductors)

Weight

GC-200 Relay 1.25 lbs. (0.57 kg)

GC2DSP Display 0.88 lbs. (0.40 kg)

Sensors Variable

Performance Characteristics See Trip Curve, Figure 10

Standards UL 1053; ANSI C37.90; CAN CSA C22.2 No. 144; FCC; RFI; EN6100; EMII: EN55022A

UL File No. E48368

Table 4: GC-200 Sensor Terminals

Sensor

Modules

Secondary Terminals Test Signal Terminals

Signal Common Signal Common

T Series Sec. Sec. Test Test

R Series Sec. Sec. Test Test

RZ Series W1 W2 R3 R4

GT Series X1 X3 X2 X4 X6 9

Table 5: GC-200 Relay Terminals

1Trip Solenoid NO 10 Ground-Fault Sensor

Input Common 19 Reset Input

2Trip Solenoid Common 11 No connection 20 Reset Input Common

3Alarm Contact NO 12 1000:1 Ground-Fault

Sensor Input 21 Auxiliary Trip Input

4Alarm Contact NC 13 No connection 22 Auxiliary Trip Input

Common

5Alarm Contact Common 14 600:1 or 700:1 Ground-

Fault Sensor Input 23 24 Vdc -

6ZSI IN Signal Z3 15 No connection 24 24 Vdc +

7ZSI IN Ground-Fault Z5 16 MDGF Signal Input 25 120 Vac Input

8ZSI OUT Z2 17 No connection 26 No connection

9ZSI OUT Signal Z1 18 MDGF Signal Common 27 120 Vac Common

0600DB0002R08/11 GC-200 Ground-Fault Relay System with GC2DSP Display

09/2011 GC-200 Relay Wiring

Figure 9: Connections Diagram for GC-200 Ground-Fault Relays

Trip

Solenoid

GC-200

Ground-fault Relay

Auxiliary contact

on protected

disconnect

120 Vac

Control

Transformer

Optional

Test Signal

ZSI OUT Signal Z1

Secondary

Output

GC2DSP

Display

Auxiliary

Trip Input

Ground-fault

Sensor (CT)

Load

Test

Input

Ground-fault

Sensor Input Common

24 VDC -

24 VDC +

1000:1 Ground-fault

Sensor Input

600:1

700:1

Disconnect

Max.: 30 ft.

[9.1 m]

MDGF Signal Input

MDGF Signal Common

ZSI OUT Z2

ZSI IN Ground-fault Z5

ZSI IN Signal Z3

Alarm Contact Common

Alarm Contact NC

Alarm Contact NO

Reset Input

Neutral

Line

120

Vac

Optional

Ground

ØØN

Ground-fault

Sensor Input

Optional Ground

of CT Frame

Optional

Ground

09313037

GC2DSP

Display Module

GC-200 Ground-Fault Relay System with GC2DSP Display 0600DB0002R08/11

Data Bulletin 09/2011

Electrical equipment should be installed, operated, serviced, and maintained only by

qualified personnel. No responsibility is assumed by Schneider Electric for any

consequences arising out of the use of this material.

Square D™ and Schneider Electric™ are trademarks or registered trademarks of

Schneider Electric. Other trademarks used herein are the property of their respective

owners.

Schneider Electric USA, Inc.

3700 Sixth Street SW

Cedar Rapids, IA 52411 USA

1-888-778-2733

www.schneider-electric.us

Figure 10: GC-200 Relay Trip Curve

.15

.05

.06

.07

.08

.09

1.5

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

.15

.05

.06

.07

.08

.09

1.5

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

100

.005

.006

.007

.008

.009

.01

.015

.02

.03

.04

.05

.06

.07

.08

.09

.15

1.5

150

200

300

400

500

600

700

800

900

1000

1500

2000

3000

4000

5000

6000

7000

8000

9000

10000

TIME IN SECONDS

MULTIPLE OF MAXIMUM CURRENT SETTING (xIn)

150

200

300

400

500

600

700

800

900

1000

1500

2000

3000

4000

5000

6000

7000

8000

9000

10000

MULTIPLES OF MAXIMUM CURRENT SETTING (xIn)

1 Cycle

1/2 Cycle

.005

.006

.007

.008

.009

.01

.015

.02

.03

.04

.05

.06

.07

.08

.09

.15

1.5

100

Ground-fault I t OFF and ON

CHARACTERISTIC TRIP CURVE NO. 931-2

GC200 GROUND-FAULT RELAY WITH

ADJUSTABLE GROUND-FAULT PICKUP AND DELAY

Delay

Seconds at 1x In

0.1

0.2

0.3

0.4

The time-current curve information is to be used for application

and coordination purposes only.

Curves apply from -30°C to +60°C ambient temperature.

Ground-

fault

Delay Bands

I²t ON

Notes:

In =

30 A for GC200C

300 A for GC200D

1200 A for GC200E

0.2

0.8

0.4 ON

0.4

0.1 ON

0.2 ON

0.3 ON

0.3 OFF

0.3

0.4 OFF

1.0

0.5

0.7

0.9

Ground-

fault

Delay Bands

I t OFF

(fixed delay)

Maximum Unrestrained

Ground-fault Delay

Ground-fault

Pickup

x In

0.1 OFF

0.2 OFF

0.6

0.1

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