Switch Moving Contact Unit Intersecting Arm Orientation
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Solution Overview
Problem
Switches with larger capacity are susceptible to arc damage, which can disable their contacts and reduce functionality.
Innovation Solution
A switch design featuring a moving contact unit with arms extending in a direction intersecting with the movement direction, allowing the moving contact to come into contact with both common and individual stationary contacts, reducing arc damage and enabling higher capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the switch is designed with larger capacity, then the power handling capability is improved, but the contacts become more susceptible to arc damage
Solution Approach 1:
The patent changes the orientation of the arms from extending in the sliding direction to extending in a direction intersecting with the sliding direction. This dimensional change positions the arms perpendicular to the arc path, so that arcs generated during contact separation do not travel along the arms but instead jump across to the stationary contacts, protecting the arms from arc damage while maintaining high switch capacity
2Device complexity
If the arms extend in the sliding direction to connect contacts, then the structural simplicity is improved, but the arms become vulnerable to arc damage in their longitudinal direction
Solution Approach 1:
The arms are reoriented to extend in a direction intersecting with the sliding direction rather than parallel to it. This reorientation changes the spatial relationship between the arms and the arc path, causing arcs to jump across the arms to the stationary contacts instead of traveling along the arms, thereby protecting the arms from arc damage while maintaining structural simplicity
Data Source
AI summary
A switch includes a housing, a common stationary contact terminal, an individual stationary contact terminal, and a plunger including a moving contact unit. The moving contact unit includes a body, a first arm, a second arm, and a third arm extending from the body in a direction intersecting with a parallel direction in which the common stationary contact terminal and the individual stationary contact terminal are arranged parallel to each other, electrically interconnected with each other, and are spaced apart from one another in the parallel direction, a first moving contact included in the first arm, a second moving contact included in the second arm, and a third moving contact included in the third arm.