Circuit Breaker Arc Chamber Side Flange Material
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Solution Overview
Problem
Low voltage electrical circuit breakers face limitations in maximum arc switch voltage, switching speed, and retention of performance after multiple short circuit interruptions.
Innovation Solution
The arc formation chamber is partially bounded by a side flange made of a flame retardant polymeric composition comprising a thermoplastic polymer with a triazine-based flame retardant and melam, along with a reinforcing agent, which increases the maximum applicable switching voltage and allows faster switching times with reduced energy dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flame retardant materials are used in the arc formation chamber, then manufacturing cost is reduced, but dielectric strength retention and switching performance deteriorate
Solution Approach 1:
The patent applies composite materials by combining thermoplastic polymer with triazine-based flame retardant (melam) and reinforcing agents (glass fibers, talcum) to create a side flange material that achieves superior dielectric strength retention and arc extinguishing performance while remaining manufacturable through conventional injection molding processes
2Power
If higher switching voltage is implemented, then circuit breaker protection capability is improved, but energy dissipation and arc intensity increase
Solution Approach 1:
The patent converts the harmful arc energy into beneficial effects by using the flame retardant polymeric composition that generates insulating gas when exposed to arc, which helps extinguish the arc and improves dielectric strength retention, thereby enabling higher switching voltage capability with controlled energy dissipation
3Speed
If switching speed is increased, then fault interruption capability is improved, but mechanical stress on components increases
Solution Approach 1:
The patent changes the material parameters of the side flange by using high-melting-point thermoplastic polymer (melting temperature ≥260°C) combined with triazine-based flame retardant and reinforcing agents, which maintains mechanical integrity and structural strength during high-speed switching operations while enabling improved arc extinguishing performance
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 configuration enhances the dielectric strength retention and switching performance of the circuit breaker, enabling improved arc extinguishing and reduced energy dissipation without compromising the mechanical and electrical properties of the housing.
Implementation Method 1
a flame retardant system comprising a triazine based flame retardant... the arc is extinguished under air... gas generated by the arc is expanded
Implementation Method 2
thermoplastic polymer comprises a polyamide with a melting temperature of at least 260 °C... enables improved arc extinguishing and reduced energy dissipation without compromising the mechanical and electrical properties
Implementation Method 3
at most 15 wt.% of a reinforcing agent, such as glass fibers, talcum... enhances the dielectric strength retention and switching performance
Data Source
AI summary
The invention relates to an electrical circuit breaker comprising an arc formation chamber and an arc extinguishing chamber, the arc formation chamber being at least partially bounded by a side flange or at least a part of a side wall consisting of a polymeric composition comprising a thermoplastic polymer, a triazine based flame retardant, at most 0 - 5 wt.% of phosphorous or halogen containing flame retardants, and 0 -15 wt.% of a reinforcing agent, wherein thermoplastic polymer comprises a polyamide with a melting temperature of at least 260ºC and the triazine based flame retardant comprises at least 20 wt.% of melam, wherein the weight percentages (wt.%) are relative to the total weight of the polymeric composition.