Hinged Fastener Cap for High Amp Circuit Breaker Isolation
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Solution Overview
Problem
High amp circuit breakers face issues with insufficient electrical isolation between input and output terminal studs, leading to potential shorting, and require ring terminals to be installed at an angle due to existing dividing wall designs that do not extend high enough and interfere with parallel orientation.
Innovation Solution
A hinged fastener cap with a dividing flange is used to provide electrical isolation between terminal studs, allowing for optimal orientation of ring terminals by rotating to a closed position that forms part of a dividing structure between the studs, preventing shorting and enabling parallel installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If terminal studs are positioned side-by-side to reduce surface area, then space utilization improves, but electrical isolation becomes insufficient
Solution Approach 1:
The base is segmented into multiple electrically isolated sections using dividing walls and isolating structures. The dividing walls extend between terminal studs to create separate electrical zones, preventing current flow between adjacent terminals while maintaining compact side-by-side positioning.
Solution Approach 2:
Electrically insulating materials and structures are introduced as intermediaries between the terminal studs. These include dividing walls made of insulating material and isolating structures positioned between adjacent terminals, which act as mediators to prevent electrical shorting while allowing close spacing.
2Reliability
If a dividing wall is added between terminal studs to provide isolation, then electrical isolation improves, but device complexity increases
Solution Approach 1:
Multiple isolation functions are merged into integrated structures. The dividing walls serve dual purposes of electrical isolation and structural support, while isolating structures combine fastening functions with electrical isolation, reducing the need for separate components.
Solution Approach 2:
The isolating structures are designed to perform multiple functions simultaneously: providing electrical isolation between terminals, serving as mounting surfaces for terminal studs, and acting as structural support elements. This multi-functionality reduces overall device complexity.
3Reliability
If a circular flange protrudes from the base to isolate a fastener, then fastener isolation improves, but ring terminal orientation is restricted
Solution Approach 1:
The isolating structures extend in multiple dimensions to provide isolation without creating protruding flanges that would interfere with terminal orientation. By distributing isolation features across different spatial dimensions, the design allows ring terminals to be installed in optimal orientations.
Solution Approach 2:
Electrical isolation is applied locally at specific points where needed between terminals, rather than using a protruding flange that creates global interference. This localized approach provides necessary isolation while maintaining clear installation paths for ring terminals.
Data Source
AI summary
A high amperage circuit breaker and terminal isolation fastener cap is disclosed. The circuit breaker includes a base having a cavity formed in a top surface thereof, with a mounting hole located within the cavity. Input and output terminal studs are secured to the base and are positioned in a side-by-side arrangement. The hinged fastener cap comprises a fastener receptacle positioned within the cavity of the base and a cover member rotatably attached to the fastener receptacle via a hinge member, such that the cover member may be rotated to a closed position relative to the fastener receptacle. The cover member includes a dividing flange formed thereon that, when the cover member is in the closed position, forms at least part of a dividing structure positioned between the input and output terminal studs to provide electrical isolation therebetween.