Secondary Disconnect Assembly Contact Alignment Features
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Solution Overview
Problem
Existing electrical switching apparatus, such as circuit breakers, face challenges in ensuring proper alignment and stabilization of secondary disconnect assembly components, which is crucial for reliable operation and preventing damage from improper connections.
Innovation Solution
The secondary disconnect assembly incorporates contact alignment features, including tapered portions and chamfers, and error-proofing features to ensure accurate alignment and orientation of accessory plugs with terminal blocks, along with retention mechanisms to stabilize and secure the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional secondary disconnect assembly components are used without alignment features, then the device complexity is reduced, but the manufacturing precision and reliability of connections deteriorate
Solution Approach 1:
The patent incorporates alignment features (tapered portions and chamfers) into the accessory plug design before assembly. These features pre-establish the correct geometric relationship between the accessory plug and terminal block, ensuring accurate alignment during insertion without requiring complex external alignment mechanisms.
Solution Approach 2:
The alignment features act as intermediary elements between the accessory plug and terminal block. The tapered portions and chamfers serve as mediating geometric forms that guide the mating components into proper alignment, reducing the need for high-precision manufacturing throughout the entire assembly while maintaining connection reliability.
2Reliability
If alignment features are added to ensure proper connection, then the reliability of electrical connections is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The patent applies alignment features (tapered portions and chamfers) only at specific critical locations on the accessory plug where contact with the terminal block occurs. This localized approach ensures reliable alignment and connection while minimizing the impact on overall manufacturing complexity, as only specific regions require precision features rather than the entire component.
3Stability of the object's composition
If retention mechanisms are incorporated to secure components, then the stability of the assembly is improved, but the device complexity increases
Solution Approach 1:
The patent integrates retention mechanisms with the existing structural elements of the secondary disconnect assembly. The alignment features and retention structures are combined into a unified design where the same geometric features that provide alignment also contribute to securing the connection, reducing the need for separate, additional retention components.
Data Source
Figure 1
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AI summary
A secondary disconnect assembly (100) is for an electrical switching apparatus (2), such as a power circuit breaker (2). The secondary disconnect assembly (100) includes a terminal block mount (202) having a number of first mounting features (280,290,292), at least one terminal block (400), and at least one accessory plug (500). Each terminal block (400) includes a number of receptacles (410,412) and a number of second mounting features (480,490,492), which cooperate with the first mounting features (280,290,292) to properly align, mount and stabilize the terminal block (400) on the terminal block mount (202). Each accessory plug (500) includes a number of contact alignment features (452,454,456,458,540,542,550,552) structured to align and guide the accessory plug (500) into a corresponding one of the receptacles. (410,412).