Banner Engineering SI-LS42DMH Safety Interlock

Banner Engineering's SI-LS42DMH is a locking-style safety interlock switch with a solenoid-locked body, designed for guarding access doors on industrial equipment. It operates from 24 V ac/dc and provides two NC contacts plus one NC/one NO auxiliary contact, all housed in a thermoplastic enclosure measuring 170 × 43 × 45 mm. The unit carries IP67 ingress protection, a Power Lock mechanism that secures the interlock when the door is closed, and a wide operating temperature range of -25 to 70 C. Safety ratings include PL e and Cat 4 with SIL CL 3; the device is rated for a B10d of 2 million cycles and a mechanical life of about 1 million operations. Electrical characteristics include a rated operating current of 4.4 VA, inrush of 12 VA for up to 0.2 s, and extraction force of 1500 N. This SI-LS42DMH model supports standard wiring chamber connections and is intended for use as part of Banner’s SI-LS42 interlock family to safeguard access points on machinery, enabling controlled machine start-up only when doors are securely closed. Typical applications include guarding doors on presses, conveyors, and robotics cells where reliable, fail-safe interlocking is required.