Allen-Bradley 440R-S13R2 Guardmaster Safety Relay

The Allen-Bradley 440R-S13R2 Guardmaster Safety Relay is a single-input safety relay used to monitor emergency stop devices and safety circuits in industrial control systems. Typically mounted in machine control panels, robotic cells, packaging equipment, and automated production lines to ensure reliable safe shutdown of hazardous equipment, it provides force-guided relay outputs for secure safety circuit control. The unit operates from 24 V DC (supply voltage is application dependent) and is designed for DIN rail mounting in machine safety applications; its use and configuration determine the applicable safety category. Common replacements include Allen-Bradley 440R-S12R2 and 440R-N23132, as well as Siemens 3SK1111-1AB30.