Plug-On Neutral Rail for AFI Breaker Mounting
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Solution Overview
Problem
Existing electrical distribution panels with arc-fault interruption (AFI) and ground-fault interruption (GFI) circuit breakers face challenges due to the need for pigtails, increased wiring complexity, and susceptibility to accidental dislodgement or connector damage when removing and reinstalling circuit breakers.
Innovation Solution
The introduction of a separate conductive mounting or positioning rail connected to the neutral bus bar eliminates the need for pigtails and incorporates a rounded plug-on neutral bus bar design that prevents connector damage during common removal motions, ensuring secure installation and easy reinstallation of circuit breakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pigtail conductor is used to connect the breaker to the neutral bar, then the electrical connection is established, but the wiring complexity increases and wiring clutter is created
Solution Approach 1:
The patent extracts and eliminates the pigtail conductor from the system by implementing a direct plug-on neutral connection. The circuit breaker is designed with an integrated neutral connector that plugs directly into the neutral bar, removing the need for separate pigtails and reducing wiring complexity while maintaining reliable electrical connection
Solution Approach 2:
The patent merges the neutral connection function into the circuit breaker body itself. The breaker incorporates a built-in neutral connector that combines the electrical connection function with the breaker housing, eliminating the need for separate pigtail conductors and simplifying the overall wiring system
2Reliability
If the circuit breaker is extended in length to reach the neutral bar, then the plug-on connection is achieved, but the breaker dimensions are increased
Solution Approach 1:
The patent changes the connection approach from extending the breaker lengthwise to utilizing a plug-on mechanism that connects in a different dimensional orientation. The neutral connector plugs into the neutral bar from the side or front, allowing reliable connection without increasing the breaker's length
3Device complexity
If the plug-on neutral connection is made, then the need for pigtails is eliminated, but the connection is susceptible to accidental dislodgement
Solution Approach 1:
The patent employs an asymmetric interlocking sequence where the neutral connector and neutral bar are designed with complementary asymmetric features. This asymmetry ensures that the connector can be easily inserted but requires a specific reverse sequence for removal, preventing accidental dislodgement while maintaining wiring simplicity
Data Source
AI summary
A load center is equipped with a neutral phase conductive rail with breaker mounting and retention features providing automatic neutral connection for a plug-on mounted AFI and/or GFI circuit breaker. Breakers may be designed to have specific interfaces to the breaker mounting and retention features of the load center rails. The neutral rail may have two pieces including a breaker undercut positioning rail shorted to a standard neutral rail, or a neutral rail may be designed to have all mounting features integrated therewith. The new panel is compatible with non-AFI and non-GFI breakers.