Schmersal SRB-NA-R-C.35 CHI-24V Safety Controller

Schmersal SRB-NA-R-C.35/CHI-24V is a 24 V DC safety controller in the SRB family designed to form the safety logic between guard devices and machine control. It provides three normally open safety outputs and one normally closed auxiliary contact, with a dual‑channel input configuration (CHI-24V) for monitoring two safety devices on a single module mounted on a 35 mm DIN rail. The unit is powered from a 24 V DC (PELV) supply, supports operation from -25 °C to +55 °C, and has an IP40 enclosure rating with an approximate weight of 1.15 kg. In terms of safety performance, it supports Category 4 / PL e per EN ISO 13849-1 and SIL 3 per IEC 62061, and it conforms to EN 60947-5-1 with CE marking. The response time is specified as ≤ 20 ms, and restart is via a manual monitored reset, providing deterministic behavior after a safety interruption. This safety controller is well suited for use with guard interlocks, emergency-stop circuits, and other safety inputs on automated lines where reliable, fast safety signaling and straightforward integration with 24 V control circuits are essential.