FIELD: instrument engineering.
SUBSTANCE: invention relates to step switch with vacuum switching lamps. Wherein general idea of invention consists in the fact that along with known level of equipment arranged on drive shaft (1) without possibility of rotation by first cam disc (2) to transfer opening stroke force of vacuum switch lamp contact system (22), according to invention provide installed on drive shaft (1) without possibility of rotation second cam disc (3), which via the spring-lever system arranged in system (6) of swinging levers, provides sufficiently high opening force to movable pusher of vacuum switch lamp (22) even in case of load at short circuit.
EFFECT: provides possibility to compensate allowances of contact system.
9 cl, 1 dwg
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