Electrical circuit breaker

In an electrical circuit breaker including a heat responsive bimetal element with a capacity for deflecting upon passage of current through the circuit breaker with the deflection occuring under fault conditions resulting in a displacement by the bimetal element of a movable member having a movement serving to initiate a tripping operation of the circuit breaker, the improvement comprising:

• an adjustable element for transmitting deflection of the bimetal element to the movable member, the adjustable element including a wedge adjustable for varying the thickness thereof and increasing or decreasing the amount of deflection of the bimetal element for moving the movable element to cause the tripping, a slide for mounting the wedge and being adjustably displaceable in a plane substantially parallel to the plane of the bimetal element, and means for enabling the slide to be displaced manually including a boss eccentrically mounted upon a rotatable knob and located between two confronting thrust surfaces provided at opposite sides of a recess in the slide, the positioning of the wedge increasing or decreasing the amount of deflection of the bimetal elements for moving the movable member to cause tripping of the circuit breaker.