Auxiliary trip device for a circuit breaker

An auxiliary trip device for a circuit breaker having a trip bar, comprising:

• an electromechanical actuating device including a coil provided in a sheath having a bore therein, a fixed core and a movable plunger being provided in said bore, the plunger and the fixed core being axially spaced apart from each other to form an air-gap therebetween, a first spring for biasing said plunger away from said fixed core, and a push-rod connected to said plunger and extending therefrom and through said fixed core, said plunger having an actuating end;
• an energy storage system including a blade for actuating the trip bar of the circuit breaker, a latch device having an actuating part and being adapted to lock the blade to prevent movement thereof and to release the blade to allow movement thereof, and a second spring for biasing the blade against the latch device, said second spring storing and releasing an amount of energy during movements of the blade which is greater than an amount energy stored and released by said first spring during movements of the plunger with respect to the fixed core, wherein said actuating end of the push-rod is spaced apart from the actuating part of the latch device, and said push-rod is axially slidable with said plunger such that said actuating end contacts the actuating part to release the blade.