The System Sensor EOLR-1 Relay is a critical component for technicians managing 4-wire smoke detector power supervision. This epoxy encapsulated relay is engineered for maximum reliability in harsh environments, featuring a 9 to 40Vdc operating voltage range that ensures compatibility with most standard fire alarm control panels (FACPs) and auxiliary power supplies. As a single-pole single-throw (SPST), normally open device, it is designed to monitor the integrity of your power circuit. When power is lost, the relay drops out, breaking the EOL supervision circuit and triggering an immediate trouble condition at the panel. Built with 8" wire leads for flexible installation, the EOLR-1 is often used as a power supervision relay to ensure that detectors remain operational. Its end-of-line relay configuration allows for high-current switching up to 3A at 30Vdc, making it suitable for fan control, damper activation, and AHU shutdown. The low current draw of 20mA maximum makes it an efficient choice for large-scale commercial loops. Key Benefits: Universal Compatibility: Wide operating voltage range of 9 to 40 VDC covers both 12V and 24V fire/security systems. Environmental Protection: Epoxy encapsulated housing protects internal components from moisture and dust, ensuring life-safety circuit integrity. Code Compliance: Facilitates NFPA 72 requirements for supervising the power supply to 4-wire smoke detectors. Easy Integration: Compact footprint and 8-inch color-coded leads simplify mounting inside standard junction boxes or enclosures. Common Questions: How do I wire the EOLR-1 for power supervision? Connect the red and black leads to the last detector's power terminals and wire the violet leads in series with the EOL resistor of the zone circuit. Can this relay be used for AC loads? Yes, the contacts are rated for up to 0.5A at 120VAC for resistive loads, though it is primarily designed for DC supervision. What happens if the power to the smoke detectors fails? The normally open contacts will open, breaking the supervision loop and reporting a trouble signal to the alarm panel. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
