Insulative Plastic Bail for Circuit Breaker Gas Venting
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Solution Overview
Problem
Existing circuit breaker designs face challenges with hot gases and conductive materials during operation, leading to complex and expensive structures, and limited design freedom due to the need to avoid and vent these gases, especially in enclosures.
Innovation Solution
A circuit breaker operating system featuring a mechanical base and bail made of insulative synthetic plastic, allowing for switching and venting of gases without conducting charges, with a gas directing cover that redirects and confines venting gases to reduce enclosure space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conductive materials are used for operating structures, then mechanical strength and durability are improved, but charge conduction from hot ionized gas occurs causing safety issues and design restrictions
Solution Approach 1:
The patent changes the material parameter from conductive to insulative, using synthetic plastic materials for the bail and mechanical base. This eliminates charge conduction from hot ionized gas while maintaining structural integrity through appropriate material selection and design
Solution Approach 2:
The patent uses molded synthetic plastic components that are cost-effective and can be easily replaced if needed, eliminating the need for expensive metal operating structures while sufficient for the application requirements
2Object-affected harmful factors
If greater distances are provided for venting gases, then hot ionized gas and plasma can be vented more effectively, but available space and design freedom are adversely affected
Solution Approach 1:
The patent uses the insulative properties of synthetic plastic materials to contain and direct hot ionized gas flow paths, converting the potential harm of hot gas into a manageable flow pattern that protects surrounding components while maintaining compact dimensions
Solution Approach 2:
The insulative synthetic plastic bail and base act as intermediaries between the circuit breaker contacts and surrounding components, blocking charge conduction paths while allowing controlled venting of hot gases through designated pathways
3Device complexity
If multiple features are built into the same operating structure, then device complexity is reduced, but manufacturing cost and difficulty increase
Solution Approach 1:
The patent divides the operating structure into separate molded plastic components (bail, mechanical base, etc.) that can be manufactured independently using cost-effective molding processes, then assembled together. This reduces per-part manufacturing complexity while maintaining overall structural simplicity
Solution Approach 2:
The synthetic plastic bail serves multiple functions: it provides mechanical leverage for operating the circuit breaker, acts as an insulator to prevent charge conduction, and structures the venting paths for hot gases. This multi-functionality reduces the number of separate components needed
Data Source
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AI summary
An operating system for a circuit breaker includes a bail and a base that supports the circuit breaker and the bail. The bail extends around the circuit breaker and is pivotally attached to the base, such as by snap engagement. The bail and the base are made of an insulative plastic material such that the circuit breaker may vent hot gases, charged particles, plasma and the like without transferring charge to the operating system components. Additional features may be molded into the parts, such as supports and operators for auxiliary switches.