Stored energy trip unit

Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices

Patent

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Details

335 21, 335 42, H01H 7348, H01H 7512

Patent

active

043863299

ABSTRACT:
A movable contact is adapted to engage with and disengage 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. Further, 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 retaining means. An electrical circuit, including the contacts, is responsive to an overload current through the circuit breaker for causing the armature latch to partially 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.

REFERENCES:
patent: 3264428 (1966-08-01), Hollyday
patent: 3487343 (1969-12-01), Myers et al.
patent: 4090156 (1978-05-01), Gryctko

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