Circuit Breaker Lug Indicator for Wire Insertion Verification
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Solution Overview
Problem
Residential circuit breakers lack an effective indicator to ensure proper insertion of panel wires, leading to potential arcing, thermal overload, or power loss due to partial insertion, which is not visually discernible to installers or contractors.
Innovation Solution
Incorporating a panel wire insertion lever within the circuit breaker that provides a visual indication of proper insertion and secure connection, using a pivoting lever that restricts screw tightening until the wire is fully inserted, and remains accessible after securement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no indicator is provided for wire insertion status, then the device structure remains simple, but the installer cannot determine if the panel wire is fully inserted leading to potential safety issues
Solution Approach 1:
The patent employs color-coded visual indicators (green dot for proper insertion, red dot for improper insertion) to clearly communicate the wire insertion status to the installer. This color change mechanism provides immediate, intuitive feedback without requiring complex electronic systems or additional components beyond the indicator elements already integrated into the lug assembly.
2Reliability
If a visual indicator is added to show wire insertion status, then installation reliability improves, but the device complexity increases
Solution Approach 1:
The patent integrates the visual indicator mechanism directly into the existing lug assembly structure. The indicator elements (colored dots or windows) are incorporated as part of the lug body or cover, combining the structural function of the lug with the indicator function in a single integrated component rather than adding separate, standalone indicator devices.
Solution Approach 2:
The indicator system automatically displays the wire insertion status based on the physical state of the lug and wire connection. The mechanism self-regulates to show green when properly inserted and red when improperly inserted without requiring external power sources, electronic controls, or manual operation by the installer.
3Productivity
If the lug screw can be tightened without restriction, then the installation process is faster, but the wire may be partially inserted causing arcing or thermal overload
Solution Approach 1:
The patent requires the installer to first insert the wire fully into the lug body before tightening the screw. The visual indicator must show green (proper insertion) before the tightening process begins, ensuring the preliminary action of complete wire insertion is accomplished. This prevents partial insertion issues before they can occur during the tightening operation.
Solution Approach 2:
The visual indicator provides immediate feedback to the installer about the wire insertion status. The green/red color code gives real-time information about whether the wire is properly positioned, allowing the installer to correct improper insertion before tightening the screw and potentially preventing arcing or thermal overload conditions.
Data Source
AI summary
A residential circuit breaker is provided with means for showing proper installation of a panel wire to ensure that an installer/a contractor is aware that the panel wire has been fully inserted into a circuit breaker lug. The residential circuit breaker comprises a circuit breaker lug having a lug body and a lug body screw. The residential circuit breaker further comprises a panel wire install indicator to indicate proper insertion of a panel wire in the lug body by providing a visual indication to an installer/contractor that the panel wire has been fully inserted in the circuit breaker lug during and after installation. The panel wire install indicator includes a panel wire indicator lever wherein the panel wire indicator lever can indicate if the panel wire has been installed properly and wherein there is a visual indication if the panel wire is no longer present in the lug body.