GUARDING DEVICE Russian patent published in 2002 - IPC

FIELD: security engineering. SUBSTANCE: device has a group of security contacts, relay and transformer connected in parallel and normally being unclosed. A normally unclosed relay contact is set in parallel to primary transformer winding, the secondary winding being connected to normally unclosed security contacts connected in parallel so that the secondary winding is shorted in closing any of the security contacts. Another version of the device has the secondary transformer winding connected to a group of normally unclosed security contacts connected in series so that the transformer is switched over into the idle running state due to any of the security contacts becoming unclosed. EFFECT: wide range of functional applications. 2 cl, 2 dwg