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US 2010/0060468 A1Published application
Electrical switching apparatus including a trip coil open circuit test circuit and system including the same
AssigneeEaton Corporation
InventorsROBERT T. ELMS, WILLIAM J. MURPHY
Life of this patent
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Abstract
A circuit breaker includes separable contacts, an operating mechanism structured to open and close the separable contacts, and a trip circuit including a trip coil and a fault detector. The fault detector energizes the trip coil to cause the operating mechanism to open the separable contacts. A test circuit is structured to test the trip coil and determine an open circuit condition thereof. An annunciation circuit is structured to annunciate the open circuit condition of the trip coil.
Claims20
An electrical switching apparatus comprising:
- separable contacts;
- an operating mechanism structured to open and close said separable contacts;
- a trip circuit comprising a trip coil and a fault detector, which energizes said trip coil to cause said operating mechanism to open said separable contacts;
- a test circuit structured to test said trip coil and determine an open circuit condition thereof;
- and
- an annunciation circuit structured to annunciate the open circuit condition of said trip coil.
3 more elements
A system comprising:
- an electrical switching apparatus comprising:
- separable contacts,
- an operating mechanism structured to open and close said separable contacts,
- a trip circuit comprising a trip coil and a fault detector, which energizes said trip coil to cause said operating mechanism to open said separable contacts,
- a test circuit structured to test said trip coil and determine an open circuit condition thereof, and
- a communication circuit structured to communicate the open circuit condition of said trip coil;
- and
- an electrical distribution panel comprising:
- a housing housing said electrical switching apparatus, and
- a receiver structured to receive the open circuit condition of said trip coil from said communication circuit and annunciate said open circuit condition.
7 more elements
Dependencies are inferred from the claim text.