The STP3A-441A024M is a safety switch with guard locking, operating on the closed-circuit current principle, where locking is achieved by spring force and release occurs when voltage is applied to the guard locking solenoid. It provides door monitoring via a slow-action switching contact configuration of 2 NC + 2 NC, giving two door position and two guard lock monitoring positively driven contacts. The housing is constructed from reinforced thermoplastic with silver alloy, gold-flashed contacts, and the unit carries an IP67 degree of protection for use in demanding industrial environments. It is suited to machine guarding applications where interlocking of movable guards is required, with connection via 3 x M20 x 1.5 and operation across an ambient temperature range of -20 to +55 °C.
Key specifications