Symmetrical Input Circuit Interrupter for Reverse Wiring Prevention
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Solution Overview
Problem
Existing circuit interrupting devices face challenges in preventing reverse wiring conditions, which can lead to unsafe electrical connections and malfunctioning of ground fault circuit interrupters (GFCIs) due to the lack of clear differentiation between line and load terminals during installation.
Innovation Solution
The implementation of a resettable circuit interrupting device with symmetrical inputs that senses and latches the correct terminal connections, ensuring that line terminals are connected to the power source and load terminals are connected to the load, thereby preventing reverse wiring by isolating the line, load, and face terminals until proper connection is established.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional circuit interrupting devices are used with asymmetric terminals, then clear differentiation between line and load terminals is achieved, but reverse wiring conditions can still occur during installation leading to unsafe connections
Solution Approach 1:
The patent applies asymmetry by providing asymmetric terminals (line terminals and load terminals) in the circuit interrupting device, where the line terminals are distinct from the load terminals. This asymmetric configuration enables clear differentiation during installation, preventing reverse wiring conditions while maintaining device reliability. The asymmetric terminal design allows installers to correctly identify and connect line and load sides without confusion.
2Ease of operation
If circuit interrupting devices provide power to user-accessible receptacles during installation, then operational functionality is achieved, but unsafe electrical connections may occur due to reverse wiring
Solution Approach 1:
The patent implements preliminary anti-action by preventing power delivery to user-accessible receptacles during the installation phase. The device includes a installation mode that blocks power flow to face terminals until proper terminal connections are confirmed. This preliminary protective measure eliminates the harmful effect of unsafe electrical connections while maintaining operational functionality once installation is complete and verified.
3Reliability
If manual verification of terminal connections is required, then reverse wiring can be prevented, but installation time and complexity increase
Solution Approach 1:
The patent applies self-service by enabling the circuit interrupting device to automatically detect and verify correct terminal connections without requiring manual verification by installers. The device includes automatic detection circuitry that identifies proper line and load terminal connections and activates power delivery accordingly. This self-verification mechanism prevents reverse wiring while reducing installation time and eliminating the need for manual checking procedures.
Data Source
AI summary
There is disclosed a circuit interrupting device with symmetrical inputs comprising a first input configured for connection to a power source or a load circuit and a second input configured for connection to a power source. There are a plurality of electrical conductors extending from the first and second inputs and a third input configured for connection to a load provided by a user. There is also a first set of transformers comprising at least one differential transformer and at least one neutral transformer connected to detect leakage current in a load circuit coupled to the first set of terminals. There is also a second set of transformers comprising at least one additional differential transformer and at least one additional neutral transformer connected to detect leakage current in a load circuit coupled to the second set of terminals.