The 440R‑N23135 (Guardmaster MSR127RP) is a single-channel, single-function safety relay designed for emergency-stop, light curtains, and safety gate applications. It features monitored manual-reset capability, compact DIN‑rail mounting, and a rugged build—ideal for small to medium industrial safety systems.
- Function: Single-channel safety monitoring (emergency-stop, guards, light curtains)
- Supply Voltage: 24 V AC/DC (±15%), optional 115/230 V AC variants available
- 🛠️ Safety Contacts:
3× Normally‑Open (immediate safety)
1× Normally‑Closed (auxiliary)
- Reset Type: Monitored manual reset—requires operator to reset after a fault
- Safety Standards: Meets Category 4 / Performance Level e (ISO 13849‑1); SIL 3 (IEC 61508 / IEC 62061)
- Response Time: Approx. 15 ms
- Diagnostic LEDs: Power, channel status, fault indication
- Terminals: Removable screw or spring-clamp connectors on 35 mm DIN railmodule—22.5 mm width
- Environmental: -5°C to +55°C operation; IP40 enclosure; IP20 terminal protection
- Electrical Life: ~2 million operations; switching rating 5 A @ 250 V AC/DC (safety outputs)
- Physical Dimensions: 99 × 114.5 × 22.5 mm; weight ~210 g
