Circuit Breaker U-Link Linkage Arc Management

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Solution Overview

Problem

Circuit interrupters face issues with arcing during contact separation, which can damage the escapement mechanism, create safety hazards, and reduce operational lifespan due to the close proximity of the moveable contact arm to arc quenching devices, leading to increased costs and complexity in design and assembly.

Innovation Solution

A circuit interrupter design featuring a moveable contact arm integrated as part of the linkage assembly, positioned vertically and away from arcs, with a U-Link configuration that directs arcs toward arc runners and arc plates, and a venting system that minimizes material usage and misalignment risks, utilizing a curved path for contact alignment and magnetic assistance to manage arcs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the moveable contact arm is positioned close to arc quenching devices, then the device complexity is reduced, but the linkage assembly is damaged by arcs

Engineering Contradiction:

Improvedevice complexityVSAvoidarc damage to linkage assembly

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The moveable contact arm is merged with the escapement mechanism to form an integrated U-Link assembly. This combines two previously separate components into one, reducing the number of parts and simplifying the overall device structure while positioning the moveable contact arm away from arc quenching devices to protect it from arc damage.

Inventive Principle:

Principle #5Merging (Combining)

2Object-affected harmful factors

If the moveable contact arm is positioned away from arc quenching devices, then the linkage assembly is protected from arc damage, but the device complexity increases

Engineering Contradiction:

Improvearc damage to linkage assemblyVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If separate moveable contact arm and escapement are used, then the design is flexible, but the assembly process is time-consuming and costly

Engineering Contradiction:

Improvedesign flexibilityVSAvoidassembly speed

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The moveable contact arm and escapement are merged into a single integrated U-Link component. This eliminates the need for separate assembly operations, reducing assembly time and manufacturing costs while maintaining the functional flexibility of the design through the integrated structure.

Inventive Principle:

Principle #5Merging (Combining)

4Device complexity

If the moveable contact arm is integrated with the escapement, then the assembly is simplified and manufacturing costs are reduced, but the arc management becomes more critical

Engineering Contradiction:

Improveassembly complexityVSAvoidarc management

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The harmful arcs are extracted and directed away from the integrated U-Link assembly toward dedicated arc quenching devices. This separation ensures that the arc management function is handled by specialized components while the integrated moveable contact arm and escapement remain protected from arc damage.

Inventive Principle:

Principle #2Taking out (Extraction)

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 design effectively protects the linkage assembly from arc damage, reduces manufacturing costs, and simplifies assembly by maximizing the distance of the moveable contact arm from arc quenching devices, enhancing safety and operational longevity.

Implementation Method 1

magnetic assistance to manage arcs

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentEP3343587B1Circuit breaker with integrated u-link

Publication Date: 2019.05.22 CARLING TECHNOLOGIES INC

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AI summary

A circuit interrupter having a moveable contact arm that forms part of the linkage assembly that connects to the handle. The moveable contact arm positioned essentially vertically in the circuit interrupter housing and positioned such that any arc that develops is drawn in a direction away from the moveable contact arm. The moveable contact arm moveable about two pivot points when the contacts are opening and closing, one of the two pivots positioned in a curved channel to slidingly move in the channel during opening and closing.