Model EOL-1224RLY End of Line Power Supervision Relay

The EOL-1 224RLY supervises the wiring providing power to 4-wire contact type smoke detectors. If the power is interrupted, the EOL-1 224RLY will cause your alarm panel to indicate a "trouble" condition. It may be energized with either 12 or 24 volts DC.


  • Fits easily into junction boxes behind pull stations and smoke detectors.
  • Inexpensive. 12 or 24 VDC operation.
  • Works with all 4-wire type smoke detectors.
  • Form C output for closing or opening circuit on activation.
  • Heavy-duty 7 amp contacts (at 11 5 VAC) for handling larger loads.
  • Compatible with most fire panels. UL-Listed for use in fire systems.
  • Completely encapsulated in epoxy for use in harsh environments.
  • Made in the U.S.A.


The EOL-1 224RLY is an encapsulated multi-voltage relay device providing Form C contacts with a 7 amp rating. The relay is low current and may be energized by either 12 or 24 VDC. A red LED is provided which indicates that the relay is energized. The model EOL-1224RLY may be mounted by using the supplied double-sided adhesive foam tape, the self-tapping screw, or by placing loosely in an electrical back box.