Abstract: The invention is a motorized linkage for engaging a thumb piece in a door mechanism. The device has an exterior lock assembly with a small battery cell and combination lock. Proper entry by a user of a security code allows the battery to operate a small motor within the exterior lock assembly. The small motor manipulates a cam-plunger which moves an actuator pin into a thumb piece. The user applies a force on to the thumb piece. This force is transmitted by the thumb piece to a latch engagement mechanism by the actuator pin. The latch engagement mechanism operates the door latch.

Abstract: This invention relates to circuit breakers and more particularly to circuit breakers for industrial power circuits with 10,000 amp interrupting capacity and 240 V ratings. This invention provides a novel arc shield arrangement whereby two arc shields are placed in series alignment with a small air gap between the shield. The effect of this new arrangement increases the arc voltage and arc braking distance and yet the air gap is kept small enough to keep the arc within the shielding and away from other components where it can cause damage.