Phoenix Contact PSR-SCP-24DC/ESP4/2X1/1X2 and 50 similar items

Phoenix Contact PSR-SCP-24DC/ESP4/2X1/1X2 Safety Relay PRE OWNED/ NORMAL WEAR This is a safety relay module used in industrial control systems to monitor emergency stop circuits, safety doors, and other protective devices. Its job is simple but critical: ? If something unsafe happens (E-stop pressed, guard opened), it cuts power safely and reliably. Key specs (from manufacturer) 24 V DC control voltage 1-channel safety input Outputs: 2 safety NO (normally open) contacts 1 signaling NC contact Switching capacity: up to ~5?6 A per contact Response time: ~60 ms Width: 22.5 mm (DIN rail module) Safety ratings (this is the big deal) SIL 3 (IEC 61508) PL e / Category 4 (ISO 13849) ? That puts it in the highest level of machine safety integrity?used where failure could cause serious injury. What ?ESP4 / 2X1 / 1X2? means These codes look cryptic but matter: ESP4 ? Designed to interface with failsafe controllers (pulse monitoring) 2X1 ? Two redundant safety outputs (NO contacts) 1X2 ? One auxiliary signaling output (NC contact) ? Translation: redundant outputs + monitoring = fault detection if contacts weld or fail Typical use cases You?ll find this relay in: Emergency stop circuits (E-Stop buttons) Machine guard doors / interlocks Light curtains / safety sensors Process safety shutdown loops A typical wiring concept: E-Stop ? Safety relay ? Contactor(s) ? Machine power How it works (simplified) The relay monitors a safety input loop If everything is OK ? outputs energize ? machine runs If a fault occurs: Input breaks OR inconsistency detected Relay drops out Power to machine is removed ? It uses force-guided contacts, so failures (like welded contacts) can be detected. SHELF: 15 BIN 1 SA