EMERGENCY STOP button insert with lock for unlocking W.1 gray. EMERGENCY STOP button insert, break contact + make contact AP/UP with lock and identical locks, with 2 keys, unlocking by 1/4 turn, with screw terminals, inserts only achieve protection class IP55 when mounted with an AP housing or frame for UP mounting from the W.1 product line. Surface-mounted installation. Material: plastic, thermoplastic, impact-resistant.