Safety relay (standalone type), Input: 1/2-channel wiring with/without short-circuit detection between contacts, Output: 3 Normally Open (N/O) contacts, 1 Normally Closed (N/C) contact, with automatic/manual start functions, Operating Voltage (UB): 24 V AC/DC, Width: 22.5 mm, Pluggable screw-type terminals, designed for monitoring emergency stop devices and safety gates.