Allen Bradley 440R-W23221 Safety Relay

Allen‑Bradley 440R‑W23221 | Guardmaster MSR330P Safety Relay

Specifications

• Inputs: 2 × dual‑channel universal safety inputs (e‑stop, light curtain, etc.)
• Safety Outputs: 3 × NO (normally open) solid‑state, 2.5 A @ 24 VDC
• Auxiliary Output: 1 × NC (normally closed) solid‑state
• Safety Rating: PLe, Category 4 (ISO 13849‑1); SIL CL3 (IEC 62061)
• Power Supply: 24 VDC (20.4–26.4 VDC), 3.5 W
• Response Time: < 25 ms
• Mounting: 35 mm DIN rail, 22.5 mm slim housing
• Terminals: Removable screw terminals
• Protection: IP20 (front)
• Operating Temp: −5 °C to +55 °C
• Certifications: CE, cULus, ATEX, IECEx
• Weight: Approx. 0.21 kg (0.46 lb)

Key Features

1. Dual‑Input Monitoring: Two independent safety functions (e.g., two e‑stops or e‑stop + light curtain)
2. SWS Single‑Wire Safety: Daisy‑chain multiple safety relays over one cable
3. Compact & Efficient: 22.5 mm width saves cabinet space; low power consumption
4. Configurable Logic: Rotary switches for AND/OR logic, no software needed
5. Diagnostics: LED indicators for power, fault, input/output status

Applications

• Safety Instrumented Systems (SIS), Emergency Shutdown (ESD)
• Machine safety: e‑stops, light curtains, safety gates, pressure mats
• Automotive, packaging, food & beverage, general machinery