FIELD: security equipment, in particular, for locking garage doors, hangars, railroad containers, and other constructive members of houses and artifacts. SUBSTANCE: device has magnet, magnetically controlled detector with first and second closed contacts and third contact which is normally open with respect to first contact. EFFECT: compatibility with various alarm systems, increased reliability of guarding due to monitoring of malicious destruction of signal line. 6 cl, 1 dwg
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