Circuit Breaker Latching Mechanism Rocker Arm
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Solution Overview
Problem
Existing latching mechanisms in circuit breakers often trip unintentionally in the OFF position due to limitations in the geometry of the tension lever and its pivot point, restricting their use to specific kinematics and requiring complex locking mechanisms to prevent tripping.
Innovation Solution
A latching mechanism with a movable rocker arm on the tension lever that locks the tension lever in the OFF position, preventing tripping even when a tripping signal is activated, allowing for flexible use across various latching mechanism kinematics without additional complex locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking contour is provided on the tension lever to lock the unlatching mechanism in the OFF position, then the latching mechanism can be reliably locked in the OFF position, but the geometry of the tension lever and its pivot point becomes restricted and the mechanism can only be used for specific kinematics
Solution Approach 1:
The blocking function is separated from the tension lever and implemented as an independent blocking lever with a blocking pawl. This segmentation allows the tension lever to maintain its original geometry for different kinematics while the separate blocking lever provides the necessary locking function in the OFF position.
Solution Approach 2:
A blocking lever acts as an intermediary element between the tension lever and the unlatching mechanism. The blocking pawl on the blocking lever engages with a blocking contour on the blocking lever (not the tension lever), providing the locking function without constraining the tension lever's geometry or pivot point selection.
2Ease of operation
If a test button is used to prevent unintentional tripping in the OFF position, then the switching mechanism can be tested without tripping, but additional complex locking mechanisms are required
Solution Approach 1:
The blocking lever is integrated into the existing unlatching mechanism structure, combining the blocking function with the test button operation. When the test button is pressed in the OFF position, it actuates the blocking lever to engage the blocking pawl, preventing unintentional tripping without requiring separate complex locking mechanisms.
Solution Approach 2:
The blocking lever is designed to be actuated by the test button itself, eliminating the need for additional locking mechanisms. The test button's movement directly controls the engagement or disengagement of the blocking pawl, allowing the system to self-regulate and prevent unintentional tripping through its own operational elements.
Data Source
AI summary
A circuit breaker includes a latching mechanism including a switching mechanism operatively connected to a tensioning element, and an unlatching mechanism by which, in response to a tripping signal, the tensioning element can be transferred from a tensioned state into an at least substantially relaxed state. The tensioning element is indirectly coupled to a tension lever which can be locked or tripped as a function of a position of a blocking pawl of the unlatching mechanism and which includes a blocking mechanism by which, in an OFF position of the latching mechanism in which the switch is open and the tensioning element is tensioned, tripping of the tension lever is prevented despite a tripping signal. The blocking mechanism of the tension lever includes a rocker arm which is fastened movably on the tension lever.