Allen-Bradley 163K434H01 Safety Interlock Switch

The Allen-Bradley 163K434H01 Non-Defeatable Plunger Interlock Switch is a safety interlock device that monitors guards, doors, and access panels while preventing equipment operation when a safety barrier is open. Featuring a spring-loaded plunger actuator and a 3-connector configuration, this equipment-mounted switch integrates directly into safety circuits for reliable machine safeguarding across industrial environments. It is commonly installed on machine guards, access doors, safety gates, protective covers, and equipment enclosures in automated machinery, conveyor systems, packaging equipment, manufacturing cells, and other industrial processing equipment requiring personnel protection. Maintenance teams and system integrators use the 163K434H01 for repair, retrofit, expansion, or replacement of existing interlock devices to maintain compliance with machine safety requirements. Designed for safety circuit integration and continuous duty operation, it supports emergency machine shutdown functions and personnel protection systems with a high-reliability mechanical design. Common replacements include Allen-Bradley 440P Series plunger safety interlock switches, Schmersal AZ 16 Series, and Omron D4NS Series, underscoring its role as an OEM replacement component for equipment and replacement installations.