Circuit Breaker Trip Unit Fixation Against Wire-Securing Forces
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Solution Overview
Problem
Circuit breakers experience accuracy and performance issues due to mechanical forces causing trip units to move within the frame when wires are secured, affecting the bimetal strip and short circuit trip units, leading to potential deflection and inaccurate operation.
Innovation Solution
The implementation of protrusions and openings in the frame or trip units to oppose movement of the trip units in the direction of securing forces, minimizing lateral and rotational displacement by conforming to each other, thereby stabilizing the trip units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wires are secured to the trip unit terminal, then electrical connection is established, but mechanical forces cause trip unit movement and deflection
Solution Approach 1:
The patent applies preliminary anti-action by positioning protrusions and openings in advance to counteract the mechanical forces that will be applied during wire securing. The protrusions are strategically located to oppose the direction of forces generated when wires are tightened to the terminal, preventing trip unit movement before the harmful displacement occurs.
Solution Approach 2:
The patent implements local quality by adding protrusions only in specific locations where mechanical forces are most likely to cause displacement. Rather than reinforcing the entire trip unit structure, protrusions are placed locally at critical points where wire securing forces are applied, providing targeted stabilization without increasing overall device complexity.
2Manufacturing precision
If trip unit is firmly secured to prevent movement, then operational accuracy is maintained, but device complexity increases
Solution Approach 1:
The patent implements local quality by adding protrusions only in specific locations where mechanical forces are most likely to cause displacement. Rather than reinforcing the entire trip unit structure, protrusions are placed locally at critical points where wire securing forces are applied, providing targeted stabilization without increasing overall device complexity.
Solution Approach 2:
The patent applies inversion by reversing the traditional approach of securing the trip unit to the frame. Instead of adding complex mounting mechanisms to the frame, the solution integrates protrusions directly into the trip unit itself, allowing the trip unit to actively engage with corresponding openings in the frame structure.
3Stability of the object's composition
If protrusions and openings are added to oppose movement, then trip unit stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent implements local quality by adding protrusions only in specific locations where mechanical forces are most likely to cause displacement. Rather than reinforcing the entire trip unit structure, protrusions are placed locally at critical points where wire securing forces are applied, providing targeted stabilization without increasing overall device complexity.
Data Source
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AI summary
A circuit breaker with improved trip unit fixation is disclosed. Another circuit breaker and a system also perform the functions of the circuit breaker. A circuit breaker includes a frame and a trip unit mounted in the frame. The trip unit includes a terminal for securing a wire to the trip unit. One of a wall of the frame and the trip unit include a protrusion and the wall of the frame or the trip unit without the protrusion includes an opening. The protrusion conforms to the opening and the protrusion and opening are positioned to oppose movement of the trip unit in a direction of a force resulting from securing the wire in the terminal.