PHOENIX CONTACT PSR-UNI-L-2X2NO-2DO-24DC-SC – Safety relays 1487647 Configurable safety relay, multi functions, up to SIL 3, Cat. 4, PL e, 2 sensor circuits, 1/2-channel operation, automatic/manual, monitored start, 2 x 2 enabling current paths, 2 signal outputs, US = 24 V DC, plug-in screw terminal block