Schmersal ST1420 Safety Switch

The Schmersal ST1420 Safety Switch is a surface-mount safety interlock that monitors guard doors and access panels to ensure hazardous equipment is isolated before entry is permitted. Designed for integration into machine safety circuits and emergency stop systems, it features safety contacts with positive opening action and operates at 250 VAC with a 6 A current rating on 50/60 Hz. The unit supports guard door and access monitoring, with an actuation type of mechanical actuator operated and housing construction available in industrial thermoplastic or metal depending on variant. Mounting is surface mount, and it complies with IEC and EN machine safety standards. Typical applications include packaging machines, conveyors, presses, CNC and stamping machines, assembly equipment, palletizing systems, and robotic work cells in automated production environments. Common replacements include Schmersal AZ16 and AZ17 safety switches, and Allen-Bradley 440K interlock switches.