Circuit Breaker Auto-Trip Mechanism Prevents Terminal Arcing
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Solution Overview
Problem
Residential circuit breakers pose a risk of arcing between the breaker and panel terminals during installation and removal, especially when power is not properly turned off, leading to potential electrical hazards.
Innovation Solution
An auto tripping mechanism is introduced, featuring an auto trip lever with a spring that prevents the breaker mechanism from latching until installed and automatically trips the circuit breaker when removed, ensuring the breaker handle remains in a tripped position until the terminals separate, thus preventing arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the circuit breaker is installed or removed from a live panel board while in the ON position, then the installation/removal process can be performed quickly, but arcing occurs between the line terminal and panel board line stab creating electrical hazards
Solution Approach 1:
The patent applies preliminary action by automatically tripping the circuit breaker (opening contacts) before the installer removes it from the panel board. The auto-trip mechanism detects when the breaker is being removed and automatically opens the contacts, preventing arcing between terminals during removal. This eliminates the need for installers to manually ensure the breaker is in the OFF position before removal, maintaining safety while enabling quick installation/removal operations.
2Ease of operation
If the breaker mechanism is allowed to latch immediately during installation, then the installation process is simpler, but the breaker may not be in a safe tripped position to prevent arcing
Solution Approach 1:
The patent introduces an intermediary auto-trip mechanism that mediates between the installation simplicity and safety requirements. This mechanism includes a trip lever that interacts with the latch mechanism, automatically preventing latching until the breaker is properly installed. The intermediary mechanism ensures that even if the installer forgets to trip the breaker manually, the auto-trip system will prevent unsafe latching, thus maintaining both operational simplicity and reliability.
3Reliability
If an auto tripping mechanism is added to prevent arcing, then safety during installation and removal is improved, but the device complexity increases
Solution Approach 1:
The patent applies self-service by designing an auto-trip mechanism that automatically detects when the breaker is being removed and trips the contacts without requiring any additional components or complex control systems. The mechanism uses the mechanical motion of removal itself to trigger the trip action through a spring-loaded lever system, making the safety function self-activating rather than requiring external control systems, sensors, or power sources.
Solution Approach 2:
The auto-trip mechanism uses simple, inexpensive mechanical components (springs, levers, and cam surfaces) rather than expensive electronic control systems. These mechanical parts are designed to be robust and long-lasting, replacing the notion of disposable components with durable, low-cost mechanical elements that provide reliable safety functionality without adding significant complexity or cost to the breaker design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This mechanism significantly reduces the risk of arcing and electrical hazards during installation and removal by ensuring the breaker is in a safe tripped position before terminal separation, enhancing user safety.
Implementation Method 1
a spring disposed at or near the end of the auto trip lever... The spring is configured to force the auto trip lever to rotate for providing a force and a deflection
Data Source
AI summary
An apparatus and a method are provided to reduce arcing between a circuit breaker having a breaker line terminal and a panel board terminal of an electrical panel board during installation and/or removal. The apparatus has an auto tripping mechanism including an auto trip lever having an end and a spring disposed at or near the end of the auto trip lever. The auto trip lever is configured to interface with an armature in a module one that houses a cradle of a breaker mechanism. The breaker mechanism is prevented from latching until the circuit breaker has been installed in the electrical panel board by keeping a breaker handle in a tripped position when the breaker line terminal and the panel board terminal are connected. The spring is configured to force the auto trip lever to rotate for providing a force and a deflection to automatically trip the circuit breaker as the circuit breaker is being removed from the electrical panel board and before the breaker line terminal and the panel board terminal separate.