Stored energy trip unit

Details Stored energy trip unit Stored energy trip unit

H - Electricity

01

H

306/60

H01H 73/48 (2006.01) H01H 71/40 (2006.01) H01H 73/52 (2006.01) H01H 75/12 (2006.01) H01H 77/02 (2006.01)

Patent

CA 1167892

22,826 Abstract of the Disclosure A movable contact is adapted to engage with and dis- engage from a fixed contact within a circuit breaker housing. A contact arm, coupled to the movable contact, is caused to trip when appropriate means are actuated. The invention resides in apparatus for actuating such means including a ferromagnetic material armature latch partially rotatable about a housing axis. The latch has a first retaining means and a first coupling surface. A latch member, partially rotatable about a housing axis, has a second retaining means and a second coupling surface adapted to couple with the first coupling surface. Fur- ther, the latch member is adapted to recouple the second coupling surface subsequent to it becoming uncoupled from the first coupling surface. A spring couples the two re- taining means. An electrical circuit, including the con- tacts, is responsive to an overload current through the circuit breaker for causing the armature latch to par- tially rotate, uncoupling the two coupling surfaces, whereupon the spring causes the latch member to rotate with an impetus, actuating the coupled means, thereby tripping the contact arm and opening the contacts.

399451

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