UL 924 Enclosed Bypass Shunt Relay
Hubbell Building Automation’s enclosed 20 Amp electrically held UL 924 Bypass Shunt Relays provide an isolated normally closed contact that can be used as a bypass shunt to power emergency egress lighting directly from the emergency generator source. The coil in these relays is powered by a normal power supply. When the loss of commercial power occurs, the contact returns to its normally closed state and bypasses control to the emergency egress lighting. These fixtures will remain connected directly to generator emergency source until transfer back to normal power occurs.
UL 924 Enclosed Bypass Relay with Remote Emergency Control
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.
UL 924 Automatic Emergency Power Transfer Control Relay
Hubbell Building Automation’s UL924 Enclosed Automatic Emergency Power Transfer Control Relays are a versatile, cost-effective unit, specifically designed for projects requiring hot and neutral switching of the load from normal circuit to emergency circuit or that include the requirement that 0-10V dimming circuits be brought to full brightness during the emergency transfer event. The unit senses loss or voltage drop of the normal utility source and within 1.5 seconds transfers the load including the neutral to the emergency source. When power is restored, the unit transfers the load back to normal utility power within 1.5 seconds. An integral momentary test switch simulates utility power failure and can be activated at any time. Any interruption of normal utility power will automatically transfer designated emergency lights to full bright regardless of current dim level or ON/OFF state of the system.
The UL924 Relays are used with wiHUBB Smart Packs, LX and CX Panel systems, Power Packs and Zone 5 Panels to meet the requirements for Emergency Lighting while powered by an emergency power source. Product specifications, ordering information, installation instructions and wiring diagrams are available at www.hubbell-automation.com.