Schmersal AZ3350-03ZK Industrial Safety Relay Module

AZ 3350-03ZK is a Schmersal metal-housed safety switch configured with three normally closed safety contacts (3 NC) and an integrated latching door handle for secure guard-door interlock applications. Its compact enclosure measures 40.5 mm by 114 mm by 38 mm and is IP67-rated, with a single M20 x 1.5 cable entry for wiring. Built for rugged industrial environments, the AZ 3350-03ZK emphasizes high contact reliability at low voltages and currents, supporting dependable safe-stop signaling in automation lines. Variants exist with different actuator-head orientations, including AZ 3350-03ZK-U90 and AZ 3350-03ZK-U270, rotated 90° or 270° to suit left- or right-handed door installations. The product is cataloged under order number 101214052 with EAN 4030661397573, and the enclosure is designed to withstand heavy use due to its metal construction and long life. Common applications include guarding interlocks on machine doors, where opening a guarded area must trigger safe shutdown; the AZ 3350 family is often paired with matching safety switches and control gear from Schmersal to complete safe-operate-safeguard circuits. This model aligns with Schmersal’s focus on durable, reliable safety technology for industrial environments and provides a compact, robust option for integrating three NC contacts into a guard door safety circuit.