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US 5,486,978 AGranted
Draw-out circuit breaker unit with coordinated cable interlock and shutter
AssigneeEaton Corporation
InventorAnthony J. Fishovitz
Life of this patent
Estimating the term…
Abstract
A cable interlock actuated by a plunger extended from the back of a draw-out circuit breaker when the breaker is closed, prevents closure of a second circuit breaker by holding it in the trip condition. A shutter which closes to prevent access to power system terminations at the rear of the draw-out circuit breaker enclosure when the breaker is removed, blocks operation of the interlock to prevent tripping of the other circuit breaker.
Claims11
A draw-out circuit breaker unit breaker electrical distribution system having conductors with stabs on ends thereof;
- said unit comprising:
- a first circuit breaker having connectors projecting from a rear face thereof for connection to said stabs, separable contacts for interrupting said current through said conductors, and a trip mechanism for tripping said separable contacts open in response to selected conditions of current in said conductors;
- an enclosure having a rear wall in which said stabs on said conductors are mounted and means supporting said first circuit breaker for movement toward said rear wall to an installed position in which said connectors engage said stabs to connect said circuit breaker in a said electric power distribution system, and for movement away from said rear wall to disconnect said connectors from said stabs for removal of said circuit breaker from said enclosure;
- a second circuit breaker;
- interlock means comprising linking means linking said first circuit breaker with said second circuit breaker, and actuating means associated with said first circuit breaker for actuating said linking means to prevent closing of said second circuit breaker when said first circuit breaker is in said installed position and said separable contacts or said first circuit breaker are closed;
- prevent means preventing actuation of said link means when said first circuit breaker is not in said installed position;
- and
- said linking means comprising a drive member mounted adjacent said rear wall of said rear wall of said enclosure and a cable attached between said drive member and said second circuit breaker and wherein said actuating means comprises a plunger extending from said rear face of said first circuit breaker when said separable contacts are closed and operating said drive member to actuate said cable when extended with said first circuit breaker in said installed position, and wherein said prevent means prevents operation of said drive member when said first circuit breaker is moved out of said installed position.
5 more elements
A draw-out circuit breaker unit for an electrical distribution system having conductors with stabs on ends thereof;
- said unit comprising:
- a first circuit breaker having connectors projecting from a rear face thereof for connection to said stabs, separable contacts for interrupting said current through said conductors, and a trip mechanism for tripping said separable contacts open in response to selected conditions of current in said conductors;
- an enclosure having a rear wall in which said stabs on said conductors are mounted and means supporting said first circuit breaker for movement toward said rear wall to an installed position in which said connectors engage said stabs to connect said circuit breaker in said electric power distribution system, and for movement away from said rear wall to disconnect said connectors from said stabs for removal of said circuit breaker from said enclosure
- a second circuit breaker;
- interlock means comprising linking means linking said first circuit breaker with said second circuit breaker, and actuating means associated with said first circuit breaker for actuating said linking means to prevent closing of said second circuit breaker when said first circuit breaker is in said installed position and said separable contacts of said first circuit breaker are closed;
- prevent means preventing actuation of said link means when said first circuit breaker is not in said installed position;
- and
- said prevent means comprising shutter means mounted in said enclosure adjacent said stabs and which open as said first circuit breaker is moved toward said installed position for exposing said stabs for engagement with said connectors and which closes to cover said stabs when said first circuit breaker is moved away from said installed position, said shutter means preventing actuation of said linking means when closed.
5 more elements
Dependencies are inferred from the claim text.