LOW-VOLTAGE SWITCH Russian patent published in 2014 - IPC H01H71/74 

FIELD: electricity.

SUBSTANCE: low-voltage switch (1) for opening and closing electrical contacts with thermal protection system (3) of bimetallic type is provided with uncoupling lever (5) that actuates forced contact opening device (2), bimetallic element (4) with restrained part (4a) and free part (4b) capable of intercepting uncoupling lever (5), as well as calibration device (6) of position of bimetallic element (4), which includes pusher (7) borne against bimetallic element (4). With that, pusher (7) is movable under action in axis direction and under action in circumferential direction.

EFFECT: possibility of performing high-accuracy preliminary and fine calibration of a switch during its manufacture, as well as re-calibration of the switch after long period of its operation by means of simple devices without any need for switch housing opening.

6 cl, 4 dwg