UL 924 BR Cut Sheet
2012-11-11
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Emergency Lighting Bypass Controls
UL 924 Enclosed 20 Amp
Bypass Relay with Remote Emergency Control
KEY FEATURES
• 20 Amp 120/277VAC Relay
• Available with Dual Tap 120VAC or 277VAC Coil
• N/C isolated contacts
• UL listed
• No minimum load requirement
• Five-year warranty
OVERVIEW
Hubbell Building Automation’s enclosed 20 Amp electrically held UL 924 Bypass Relay is specifically designed for projects
requiring bypass utilizing an unswitched emergency circuit that is not controlled by a relay in a panel or power pack. The control
of the lighting on the emergency circuit is switched ON and OFF based on the normal circuit switching input to the unit. When
the loss of commercial power occurs, the contact returns to its normally closed state and bypasses control to the emergency
egress lighting. The unit includes an automatic test function that simulates utility power failure and holds emergency lighting on
for 2.5 seconds each time the switched input is turned OFF.
FEATURES and BENEFITS
Features
Universal 120-277VAC Contact Rating
Bypass Relay Operation
Uniform Control of Emergency and Normal Circuits
Integral Indication of Power Source
Automatic Test
Benefits
• Easy installation to 120V or 277V loads
• Electrically held shunt bypass closes when normal utility
power fails
• Emergency lighting held ON until normal power is restored
• Unit allows for single control input for emergency
and normal circuits while in the Normal state
• Dedicated relay in panel for emergency circuit is not required
• Relay is supplied with unswitched emergency backup
power circuit
• Green LED indicates normal utility power
• Red LED indicates emergency power
• Test occurs each time the circuit is controlled OFF
• Emergency load is held on by the normally closed relay
for 2.5 seconds, then relay is returned to the normal OFF state
• Certified to meet UL requirements for testing of function
Hubbell Building Automation, Inc. | 9601 Dessau Road | Building One | Austin, Texas 78754 | {512} 450-1100 | {512} 450-1215 fax
hubbell-automation.com
10.2012
SPECIFICATIONS
# Relays & Contact Type
Contact Ratings
Coil Current
Coil Voltage Input
Operating environment
Dimensions
Housing Rating
Flame Rating
Wires
Certifications
Warranty
• One (1) SPST Continuous Duty Electrically Held Coil
• 1500 VA Tungsten @ 120VAC
• 20 Amp Ballast @ 120/277VAC
• 2 HP @ 277VAC
• 1 HP @ 120VAC
• 0.06 A @ 120VAC
• 0.06 A @ 277VAC
• UL924BRUNV: 120 or 277VAC; 60Hz
• Indoor use only
• 32° to 140°F
• Relative humidity (non-condensing): 0%–95%
• 3.75” x 1.75” x 1.25” with mounting ears for 1-gang box
• Plenum, NEMA 1
• UL94V-0
• 7”, 105° C, 600V Rated
• UL Listed, UL924
• Five years
ORDERING INFORMATION
Catalog Number Description
UL924BRUNV
UL924 Emergency Control Relay (Shunt or Bypass) with auto test 120-277VAC Coil
WIRING DIAGRAM
Hubbell Building Automation, Inc.
9601 Dessau Road | Building One | Austin, Texas 78754
{512} 450-1100 | {512} 450-1215 fax
hubbell-automation.com
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