Safety relays, ReLy, RLY3-OSSD100, Applications: Output expansion module for OSSDs, Compatible sensor types: Safety sensors with OSSDs, Connection type: Front connector with spring terminals, Restart interlock: no, External device monitoring (EDM): Via path, Outputs: 2 enabling current paths (safe), 1 feedback current path (for use as external device monitoring, not safe), Housing width: 18 mm