SAFETY RELAY Russian patent published in 2014 - IPC H02H3/20 H03K17/78 

FIELD: electricity.

SUBSTANCE: invention relates to a safety relay including an input circuit that detects the state of an external device in compliance with the fact whether external input voltage exceeds the pre-set threshold voltage or not. The safety relay includes an input circuit and an actuation unit that reads off a detection signal detected by the input circuit and performs a safety relay actuation operation. The input circuit includes a switching device that becomes current-conducting when divided voltage is supplied to it, which is obtained by means of voltage division resistors that divide external input voltage when external input voltage is higher than or equal to threshold voltage, and an opto-relay that is actuated by stabilised current of the output circuit and outputs an actuation signal to the actuation unit when the switching device becomes current-conducting.

EFFECT: technical result consists in reduction of a heat release value without any complication of circuit configuration, as well as in implementation of an input circuit capable of controlling threshold voltage for a wide range of input voltages using one circuit of contact input.

4 cl, 3 dwg