Circuit Breaker Pusher Braking Zone for High-Current Wear Reduction
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Solution Overview
Problem
Existing devices for breaking electric current, such as circuit breakers, are not suitable for high-intensity currents as they experience mechanical stress leading to premature wear and potential faults due to excessive energy release during contact separation.
Innovation Solution
Incorporating a braking zone and abutment within the device to slow down the pusher's movement and prevent sudden contact with fixed contacts, reducing mechanical stress and wear, and adding a stop to prevent kickback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the return member stores more mechanical energy to increase the repulsion threshold for high-intensity currents, then the current interruption capability is improved, but the pusher violently strikes the fixed contacts causing premature wear and potential faults
Solution Approach 1:
The patent introduces a braking zone with friction elements that act before the pusher reaches the fixed contacts. This friction braking system dissipates the excessive kinetic energy of the pusher before contact occurs, preventing violent impact and premature wear of contact pads while allowing the return member to maintain high energy storage for reliable current interruption.
2Reliability
If the return member stores more mechanical energy to increase the repulsion threshold, then the device can handle high-intensity currents, but the pusher bounces against the fixed contacts leading to potential faults
Solution Approach 1:
The friction-based braking zone provides progressive deceleration of the pusher before contact, preventing bounce and ensuring stable contact establishment. The abutment further stabilizes the system by providing a mechanical stop that prevents over-travel and kickback, maintaining contact stability under high-intensity current conditions.
3Speed
If the pusher moves quickly to close the contacts, then the switching speed is improved, but the mechanical stress and wear on contacts increases
Solution Approach 1:
The braking zone is positioned to engage the pusher body before contact with the fixed contacts occurs. This preliminary braking action reduces the pusher's velocity to a controlled level just before contact, allowing fast closing action while preventing excessive mechanical stress and wear on the contact pads.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows reliable and durable operation with high-intensity currents, reducing the risk of faults and extending the device's lifespan by minimizing contact shock and wear.
Implementation Method 1
an elastic return member which returns the pusher to its deployed position
Implementation Method 2
a braking zone forming a restriction which locally reduces the internal dimensions of the cross section of the receiving cavity, in order to slow down the pusher when it moves towards its deployed position
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
This electrical current interruption device comprises: - fixed electrical contacts (4, 6) and a movable contact (16); - a cage (12) and a movable pusher capable of translational movement relative to the cage, the cage defining a receiving cavity within which the pusher is received, the movable contact being mounted on the pusher, the movement of the pusher enabling the interruption device to be switched; - an elastic return element (28) that returns the pusher to its deployed position. The interruption device further includes, located at a distal end of the receiving cavity: - a braking zone (42) forming a restriction that locally reduces the dimensions of the receiving cavity, in order to slow the pusher; - a stop (44) to halt the movement of the pusher.