Abstract: The disclosure refers to a switch which is suitable to protect an electric circuit against overloading. The switch generally consists of a triggering assembly as well as of an interrupting assembly, wherein said triggering assembly comprises and induction unit, a thermic interrupter and an actuating needle. The induction unit comprises a coil with a yoke intended to displace the actuating needle towards the triggering assembly, when the short circuit occurs. Said thermic interrupter comprises a bimetallic membrane, which is mechanically interconnected with the actuating needle and is in the case of excess current and generating of heat displaced towards the interrupting assembly. In order to provide such switch, which could moreover enable protection against transient voltage, e.g. due to thunder bolt, such switch is furnished with a varistor, which is located within the triggering assembly in a heat-conductive relationship with said thermic interrupter.