| 摘要 |
The invention relates to an electric and/or electronic switch (1), in particular for an electric tool (15) comprising an electric motor (17), such as a battery-powered and/or mains electric tool, for example drill, grinder, saw, plane, angle grinder or similar, and a circuit arrangement (6, 6') for switching on and/or switching off the electrical current supply to the electric motor (17). The circuit arrangement (6, 6') can consist of a contact system with a fixed contact and a movable switching contact that co-operates with the latter. The circuit arrangement (6, 6') consists of electronics comprising a power semiconductor that can be switched between a blocking or a conductive state. In addition, the circuit arrangement (6, 6') has an actuating organ (5) for activating the switching operation in the circuit arrangement (6, 6'). A circuit-breaker (11) of the high-current type is associated with the circuit arrangement (6, 6'), in such a way that if a short-circuit occurs, the electrical current supply to the electric motor (17) is interrupted independently of the actuating organ (5). In addition or alternatively, the circuit arrangement (6, 6') can have an overload unit (11) in such a way that in the event of a failure of the circuit arrangement (6, 6'), the electrical current supply to the electric motor (17) is interrupted by the overload unit (11). |
