UL924 Bypass/Shunt Relays
Our UL924 Emergency Lighting 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.
Models can be ordered with a standard two-position closed/auto override test switch or with a custom two-position momentary closed/auto override test switch. These switches can be used for testing purposes to verify your emergency load is being switched properly.
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.
Remote Test for RF-Equipped ESR Models
Models denoted with an "-RF" are equipped with a wireless receiver which responds to signals transmitted by the ESRT remote test transmitter. When the signal is received, the coil of the relay is disconnected, allowing the emergency power to flow to the contacts of the relay, thus switching the designated emergency lighting on. For this operation to occur, the light switch or lighting control must be off during the test procedure.
Together these models are used to enable an inspector, in accordance with Article 700.3 of the 2011 NEC (National Electric Code), to easily activate the UL924 Emergency Bypass/Shunt Relay wirelessly with the ESRT remote test transmitter, as to prove the ability of the system to bypass the wall switch or other lighting control.
Field Wiring Verification
- Wire relay according to wiring diagram.
- Before bulb installation, red LED should be illuminated indicating utility power.
- Press button of ESRT and hold until red LED goes off. The indicated emergency power.
- Red LED will remain off for 8-10 seconds and the return to being illuminated.
Inspector Field Test
- Turn wall switch off or disable control.
- Point remote test control (ERST) towards ESR relay.
- Press button on ESRT and hold until emergency light comes on.
- Emergency light will stay on for 8-10 seconds.
Enclosed
| Model # | Description | |
|---|---|---|
| ESR01P | UL924 Enclosed Relay 20Amp DPDT 120Vac | |
| ESR02P | UL924 Enclosed Relay 20Amp DPDT 208-277Vac | |
| ESR2401B | UL924 Enclosed Relay 20Amp SPDT 24Vac/dc/120Vac | |
| ESR2401B-RF | UL924 Enclosed Relay with RF override. 20Amp SPDT 24 VAC/DC & 120 Vac | |
| ESR2401D | UL924 Enclosed Relay 10Amp DPDT 24Vac/dc/120Vac | |
| ESR2401SB-NC | UL924 Enclosed Relay 20Amp SPST-NC + Override 24Vac/dc/120Vac | |
| ESR2402B | UL924 Enclosed Relay 20Amp SPDT 24Vac/dc/208-277Vac | |
| ESR2402B-RF | UL924 Enclosed Relay with RF override. 20Amp SPDT 24Vac/dc/208-277Vac | |
| ESR2402D | UL924 Enclosed Relay 10Amp DPDT 24Vac/dc/208-277Vac | |
| ESR2402SB-NC | UL924 Enclosed Relay 20Amp SPST-NC + Override 24Vac/dc/208-277Vac | |
| ESR24P | UL924 Enclosed Relay 20Amp DPDT 24Vac/dc | |
| ESRB01C | Enclosed Relay 10 Amp SPDT with 120 Vac Coil | |
| ESRB01C-RF | Enclosed Relay 10 Amp SPDT with 120 Vac Coil and Remote Test Capability | |
| ESRB277C | Enclosed Relay 10 Amp SPDT with 277 Vac Coil | |
| ESRB277C-RF | Enclosed Relay 10 Amp SPDT with 277 Vac Coil and Remote Test Capability | |
| ESRBE01C | UL924 Encl Relay ESR + BAS ( No RF) 10 Amp SPDT, 120 Vac | |
| ESRBE01C-RF | UL924 Encl Relay ESR + BAS with RF override. 10 Amp SPDT, 120 Vac | |
| ESRBE277C | Enclosed Relay 10 Amp SPDT with 277 Vac Coil | |
| ESRBE277C-RF | Enclosed Relay 10 Amp SPDT with 277 Vac Coil and Remote Test Capability | |
| ESRH1C | UL924 Enclosed Relay 10Amp SPDT 10-30Vac/dc/208-277Vac | |
| ESRH1S-NC | UL924 Enclosed Relay 10Amp SPST-NC + Override 10-30Vac/dc/208-277Vac | |
| ESRH2C | UL925 Enclosed Relays 10Amp 2 SPDT 10-30Vac/dc/208-277Vac | |
| ESRTE01P | UL924 Encl. Relay Hi/Low sep 20Amp DPDT 120Vac power + 5-30Vac/dc control | |
| ESRTE02P | UL924 Enclosed Relay Hi/Low sep 20Amp DPDT 208-277Vac power + 5-30Vac/dc control | |
| ESRU1C | UL924 Enclosed Relay 10Amp SPDT 10-30Vac/dc/120Vac | |
| ESRU1S-NC | UL924 Enclosed Relay 10Amp SPST-NC + Override 10-30Vac/dc/120Vac | |
| ESRU2C | UL924 Encl. Relays 10Amp 2 SPDT 10-30Vac/dc/120Vac |
Track Mount
| Model # | Description | |
|---|---|---|
| ESRM2401D | UL924 Panel Relay 4.00x1.700in 10 Amp DPDT with 24 Vac/dc/120 Vac Coil | |
| ESRM2402B | UL924 Panel Relay 4.00x1.25in 20Amp SPDT 24Vac/dc/208-277Vac | |
| ESRM2402SB | UL924 Panel Relay 4.00x1.60in 20Amp SPST + Override 24Vac/dc/208-277Vac | |
| ESRMNU1C | UL924 Panel Relay 2.75x1.70in 15Amp SPDT 10-30Vac/dc/120Vac | |
| ESRMU1C | UL924 Panel Relay 4.00x1.50in 15Amp SPDT 10-30V ac/dc/120Vac |
