Circuit Breaker Terminal Shield Position Indicator
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Solution Overview
Problem
In molded case circuit breakers, the lack of visibility for the position of terminal screws can lead to improper installation, potentially causing electrical coupling damage, overheating, or safety hazards during over-current conditions, as users may forget to tighten the screws due to their non-visible position.
Innovation Solution
A position indicator system is integrated into the circuit breaker housing assembly, featuring an indicator member and spacer members that align with the terminal screws, preventing the indicator from moving into a secure position if the screw is not tightened, thus providing a visible indication of the screw's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal screw position is made visible, then the reliability of electrical connection is improved, but the device complexity increases due to additional indicator components
Solution Approach 1:
The indicator member is merged with the terminal shield to form a single integrated component. The terminal shield, which already serves to cover and protect the terminal screw assembly, now also incorporates the indicator function through the integrated indicator member. This merging eliminates the need for separate indicator components while providing visual feedback about terminal screw tightness through the alignment of indicator surfaces.
Solution Approach 2:
The indicator system utilizes the terminal screw's own position and the terminal shield's movement as the indicator member to provide visual indication. The system serves itself by using the existing mechanical components (terminal screw, terminal shield) in a dual capacity - both their original function and as the indication mechanism. When the terminal screw is properly tightened, the terminal shield moves to align the indicator surface with the housing alignment surface, providing automatic visual confirmation without requiring external monitoring devices.
2Ease of operation
If the terminal screw position is made visible, then the ease of operation is improved, but the manufacturing complexity increases
Solution Approach 1:
The indicator member is merged with the terminal shield to form a single integrated component. The terminal shield, which already serves to cover and protect the terminal screw assembly, now also incorporates the indicator function through the integrated indicator member. This merging eliminates the need for separate indicator components while providing visual feedback about terminal screw tightness through the alignment of indicator surfaces.
Solution Approach 2:
The indicator system utilizes the terminal screw's own position and the terminal shield's movement as the indicator member to provide visual indication. The system serves itself by using the existing mechanical components (terminal screw, terminal shield) in a dual capacity - both their original function and as the indication mechanism. When the terminal screw is properly tightened, the terminal shield moves to align the indicator surface with the housing alignment surface, providing automatic visual confirmation without requiring external monitoring devices.
3Device complexity
If a simple indicator system is used, then the device complexity is reduced, but the measurement precision of screw position indication may be insufficient
Solution Approach 1:
The indicator function is extracted from complex mechanical measurement systems and simplified to a visual alignment indication. Instead of using sophisticated sensors or measurement devices to detect terminal screw position, the patent extracts the essential information (whether the screw is tightened or not) and presents it through a simple visual cue - the alignment of the indicator surface with the housing alignment surface. This extraction maintains sufficient precision for the application while dramatically reducing complexity.
Solution Approach 2:
The indicator system utilizes the terminal screw's own position and the terminal shield's movement as the indicator member to provide visual indication. The system serves itself by using the existing mechanical components (terminal screw, terminal shield) in a dual capacity - both their original function and as the indication mechanism. When the terminal screw is properly tightened, the terminal shield moves to align the indicator surface with the housing alignment surface, providing automatic visual confirmation without requiring external monitoring devices.
Data Source
AI summary
A position indicator for a circuit breaker is provided. A circuit breaker housing assembly body has an alignment surface. The position indicator includes an indicator member having an alignment surface and an elongated spacer member. The indicator member is movably coupled to the circuit breaker housing assembly adjacent a terminal screw with the spacer member generally aligned with the terminal screw. The indicator member is structured to move between a first position, wherein the alignment surface is not aligned with the housing assembly body alignment surface, and a second position, wherein the alignment surface is aligned with the housing assembly body alignment surface. The spacer member engages the terminal screw and, if the terminal screw is in a terminal screw first position, the spacer member prevents the indicator member from moving into the indicator member second position.