Circuit breaker having cam surfaces on the trip member
AssigneeTexas Instruments Incorporated
InventorAime J. Grenier
Life of this patent
Estimating the term…
Abstract
A high performance, manually and automatically operable, trip-free magnetic circuit breaker incorporates a collapsible linkage having selected elements of precision molded plastic cooperating in a dual latch system, the linkage being adapted to be accurately assembled and mounted in the breaker without requiring adjustment inside the breaker housing; incorporates a double break contact system to achieve longer life, more reliable operation and improved rupture capacity; and incorporates auxiliary switch means with improved actuator biasing to achieve more reliable breaker operation in auxiliary switch applications.
Claims4
In a circuit breaker having a control means with a trip member pivotally movable from a first position to a second position for operating the control means to open a breaker circuit, and having a clapper magnetically movable toward magnet pole face means on the occurrence of a predetermined condition in the breaker circuit to engage and pivot the trip member to its second position to open the circuit on the occurrence of said circuit condition, a trip member cam surface having a first portion to be engaged by the clapper after selected initial movement of the clapper toward said pole face means when the clapper is in closely spaced relation to said pole face means for initiating trip member movement to said second position and having a cam riser portion to be engaged by the clapper during subsequent clapper movement toward the pole face means for completing trip member movement to said second position, whereby the clapper engages the first portion of the trip member cam surface only when the clapper is relatively close to said pole face means while assuring that said trip member movement occurring thereafter is adequate to effect opening of said circuit.
Dependencies are inferred from the claim text.