Modular Circuit Breaker with Double Enclosure and Spacers
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Solution Overview
Problem
Conventional low-voltage multipole circuit breakers with double enclosures face limitations in modularity, size optimization, and assembly complexity, particularly with single breaking mechanisms, which restrict electric performance and increase volume, and rotary double breaking leads to vertical offset and assembly difficulties.
Innovation Solution
A modular low-voltage multipole circuit breaker design featuring single-pole breaking units with a reversed rotary bar connection and spacers forming a double enclosure, allowing for adjustable pitch and interchangeability, with gas exhaust channels and mechanical assistance for improved assembly and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If single breaking mechanism is used to simplify connections and reduce volume, then device complexity and volume are reduced, but electric performance is limited
Solution Approach 1:
The circuit breaker is divided into multiple single-pole breaking cartridges, each handling one phase. This segmentation allows independent optimization of each cartridge while maintaining overall system performance through modular arrangement with spacers between poles.
2Length of stationary object
If rotary double breaking is used to limit width, then width is reduced, but vertical offset occurs and asymmetric front plates are required
Solution Approach 1:
Instead of using rotary double breaking that creates vertical offset, the invention inverts the approach by using single breaking with a different spatial arrangement - placing spacers between poles rather than using complex rotary mechanisms, thereby achieving compact width without vertical offset or asymmetric requirements.
3Adaptability or versatility
If conventional double enclosure is used with single-pole cartridges, then modularity is achieved, but assembly complexity increases and interchangeability is limited
Solution Approach 1:
The spacers serve multiple functions: they provide mechanical separation between poles, establish standardized pitch dimensions, enable modular assembly of different pole configurations (3-pole, 4-pole), and facilitate interchangeability of trip devices. This universal component resolves assembly complexity while maintaining modularity.
4Volume of moving object
If gas exhaust outlet is placed close to circuit breaker for compact design, then compact dimensions are achieved, but safety perimeter is reduced and arc flashover risk increases
Solution Approach 1:
The gas exhaust channel is routed through the spacers in a lateral direction rather than vertically close to the breaker. This dimensional change allows compact vertical dimensions while maintaining safe lateral distance for gas exhaust, reducing arc flashover risk without increasing overall height.
Data Source
AI summary
In order to take maximum advantage of the modularity provided by a multipole circuit breaker with double enclosure (100), a new architecture is proposed. The outer case (48) of the switchgear apparatus (100) is formed directly when assembly of the breaking device (600) is performed by juxtaposition and securing between single-pole breaking units (10), spacers (46) and side walls (50), trip device (7) and cover (64). The spacers (46) can thus be used for various functionalities, and in particular to modify the external aspect of the switchgear apparatus (100) or the nature of the trip device (7) in delayed manner.