System Sensor R-24E 4-Gang DPDT Relay Module
Overview
The System Sensor R-24E is a 4-gang DPDT (dual-pole, dual-throw) relay module rated for 10A @ 125/250 VAC per gang. Operating at 35VDC, the R-24E provides supervised multi-output relay switching for fire alarm and access control panel integration. End-of-line (EOL) supervision detects open or short circuits across relay circuits, critical for life-safety deployments where circuit fault detection is non-negotiable. The module is built for conventional fire alarm control panels and networked security systems requiring deterministic relay control across multiple zones or door strikes without latency.
Compatibility
The R-24E integrates with System Sensor fire alarm control panels and compatible third-party fire alarm systems that accept external relay modules via supervised relay input terminals. Confirm your control panel's relay input voltage (35VDC nominal) and circuit supervision protocol before procurement. The DPDT switching configuration allows each gang to independently control two separate loads (such as door strikes, solenoid valve pilots, or notification device circuits) or to parallel contacts for higher current distribution. Do not exceed 10A per contact at 125/250 VAC rated voltage — exceeding this will void the relay and potentially disable supervision.
Installation Notes
Wire the R-24E's 35VDC input directly to your control panel's auxiliary 35VDC output terminal, observing polarity. Each gang's common terminal connects to your supervised relay circuit at the panel. The EOL resistor network is pre-installed; do not bypass or remove it, as this disables circuit supervision and violates fire code in most jurisdictions. Use 14 AWG or larger for all 10A circuits; 18 AWG is acceptable for control/pilot circuits under 1A. Mount the module in a UL-listed enclosure rated for your application environment.
