Emergency UL924 Bypass / Shunt Relays
Description
Our UL924 Emergency Bypass/Shunt Relays are
designed for applications that require an emergency load to be switched on during a loss of normal
power. These economically priced relays are available prepackaged in their own NEMA 1 enclosure
or panel versions to be installed inside an existing
enclosure.
Operation
UL 924 Emergency Bypass/Shunt relays will
switch a lighting load upon loss of normal power
downstream of an emergency transfer switch,
bypassing wall switch position.
Features
• Multi-coil voltage input
Models can be ordered with a two position closed/
auto override test switch or with a custom two
position momentary on/auto override test switch.
These switches can be used to verify your
emergency load is being switched properly during
initial field wiring.
• 10, 15, 20 Amp Contact Ratings
Specifications
• Red LED utility power indicator
See reverse side.
• Two position override test switch available
• Custom two position momentary override test
switch available
• NEMA 1 enclosure
• Pre wired and prepackaged for convenience
• Mounts easily through ½” knockout or remotely
on flat surfaces
• Bright yellow color for easy identification
• Panel style for use inside control panels
• UL 924 & California State Fire Marshall
• DPDT configurations
• 5 year warranty
• Made in USA
Functional Devices, Inc.
310 South Union Street
P.O. Box 368
Russiaville, IN 46979
ESRU1S
Office
Sales
Fax
Email
765.883.5538
800.888.5538
765.883.7505
sales@functionaldevices.com
UL924 / 10 Amp Emergency Bypass/Shunt Relay
Enclosed Relay 10 Amp SPST-N/O + Override with 10-30 Vac/dc/120 Vac Coil
Contact Ratings:
10 Amp Resistive @ 277 Vac
480 VA Pilot Duty @ 240-277 Vac
480 VA Ballast @ 277 Vac
600 Watt Tungsten @ 120 Vac N/O
240 Watt Tungsten @ 120 Vac N/C
1/3 HP for N/O @ 120-240 Vac
1/6 HP for N/C @ 120-240 Vac
1/4 HP for N/O @ 277 Vac
1/8 HP for N/C @ 277 Vac
SPECIFICATIONS
# Relays & Contact Type:
Expected Relay Life:
Operating Temperature:
Operate Time:
Relay Status:
Dimensions:
Wires:
Approvals:
Housing Rating:
Gold Flash:
Override Switch:
One (1) SPST Continuous Duty Coil
10 million cycles minimum mechanical
-30 to 140° F
20mS
LED On = Activated
2.30˝ x 3.20˝ x 1.80˝
with .50˝ NPT Nipple
16˝, 600V Rated
UL Listed, UL924, UL916, UL864,
C-UL, California State Fire Marshal, CE
Plenum, NEMA 1
Yes
Yes
Coil Current:
30 mA @ 10 Vac
32 mA @ 12 Vac
42 mA @ 24 Vac
50 mA @ 30 Vac
25 mA @ 120 Vac
12 mA @ 10 Vdc
14 mA @ 12 Vdc
16 mA @ 24 Vdc
18 mA @ 30 Vdc
Wht/Blk
120 Vac
Wht/Blu
10-30 Vac/dc
Closed
Auto
Wht/Yel
Comm
Org
Org
Coil Voltage Input:
10-30 Vac/dc ; 120 Vac ; 50-60 Hz
Drop Out = 2.1 Vac / 2.8 Vdc
Pull In = 9 Vac / 10 Vdc
Notes:
» Order Normally Closed by adding “-NC˝ to end of
model number
» Order with Momentary Override Switch by adding
“-MNO˝ to end of model number
Initial Field Wiring Test Procedure
Models that have override test switches are set in the auto position from the factory. This allows emergency power to be switched to
the load. To test field wiring connections at the time of installation, the override test switch should be changed to the “closed” position (illuminating emergency lighting) and then placed back to the “auto” position. The red LED shows the normal utility power is
connected correctly.
Special momentary test switches can be ordered using “-MNO” suffix, which will automatically spring back to the auto position,
eliminating the chance to leave the switch in the closed position.
Notes
Emergency Lighting
Emergency
Lighting
Regular Lighting
Bypass / Shunt Relay
Shown with Normal
Power Energized
Emergency
Power
Emergency
Transfer
Normal
Power
Coil
Bypass / Shunt Relays
ESRU1C
ESRH1C
ESRU1S
ESRH1S
ERS2401B
ESR2402B
ESR2401SB
ESR2402SB
ESR2401D
ESR2402D
ESR01P
ESR02P
ESR24P
ESRMU1C
ESRMNU1C
ESRM2402B
ESRM2402SB