Schmersal SRB301HC-24V Safety Relay 1-Channel 24V DC

Schmersal SRB301HC-24V Safety Relay is a 24 V DC coil safety relay module designed to provide a single protective channel for guarding devices such as emergency stops and guard doors. Designed to be mounted on a DIN rail, it monitors safety inputs through positive-guided contacts and offers a signalling auxiliary contact for interlock status. The module accepts a +24 VDC supply on A1/A2 and uses input channels designated S13-S14 and S23-S24 to sense safety device status, with internal safety-enabling circuits (stop 0) to ensure a controlled safe-state if a fault is detected. The unit includes a manual start (reset) option and is built for fail-safe operation in automated environments. Its output contacts are rated for DC-12 utilisation and limited to about 0.1 A, suitable for driving relays or contactors rather than high-current loads. The SRB301HC-24V variant aligns with Schmersal’s safety-relay family designed to recognize cross-short, cable break and earth-leakage conditions in the monitoring circuit, helping maintain a verifiable safe state. Typical applications include guarding circuits around presses, conveyors, and automated doors where a safe-stop must be maintained if a guard is opened or a fault occurs. For correct wiring and installation, refer to the SRB301HC/T-24V operating instructions, which detail the terminals (S13-S14, S23-S24, 13-14, 23-24, 33-34, 41-42) and the role of the auxiliary signalling contact.