Abstract: An overloading protection system adapted for use with a shape memory alloy actuator, includes at least one shape memory alloy switching element congruently activated with the actuator, and further includes a releasable connector configured to automatically disconnect the actuator from its activation source and/or release a latch, so as to effect a secondary work output path for the actuator, when an overloading condition occurs.

Abstract: An electrical instrument switch includes a rocker switch for manual on-and-off switching and that is seated in an insulation housing. Depending on the pivot position, the rocker switch moves, with a working end that dips into the housing interior, a contact bridge between the closed position of its contact and the open position of its contact. The contact bridge is electrically connected in series with a contact spring that can be triggered thermally and hence acts as an overcurrent protection. The contact spring can move between its contact position and its open position. The contact spring is mechanically prestressed in the direction of its open position. When overcurrent occurs, it is transferred out of its contact position into its open position by a thermal triggering element. A pivot of the rocker switch counter to the mechanical prestress, in the tipping direction of the contact spring, guides the contact spring from its open position back into its contact position.