Fixed Contact Test Terminal for Screwless Voltage Measurement
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Solution Overview
Problem
The existing switching device assemblies face inconvenience in joining the voltage measurement cable to the fixed contact, requiring installation accessories like screws and nuts, which complicates the manufacturing process and assembly.
Innovation Solution
A switching device with an integral, substantially thinner test terminal on the fixed contact, accessible perpendicular to the contact, allowing direct connection with a female connector without additional accessories, maintaining the manufacturing simplicity of using copper rails for the fixed contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cable for voltage measurement is connected to the fixed contact with a terminal lug requiring screws and nuts, then the connection is secure, but the assembly process becomes complicated and time-consuming
Solution Approach 1:
The test terminal is integrated directly into the fixed contact as an integral component, merging the voltage measurement connection function with the existing contact structure. This eliminates the need for separate terminal lugs, screws, and nuts, thereby simplifying the assembly process while maintaining reliable electrical connection for voltage measurements
Solution Approach 2:
The fixed contact serves dual functions: it performs the primary current switching function and simultaneously provides a test terminal for voltage measurements. This multi-functionality is achieved by forming the test terminal as an integral part of the fixed contact, allowing both main current conduction and measurement access without requiring separate components
2Reliability
If additional installation accessories like screws and nuts are used for connecting the voltage measurement cable, then the connection is secure, but the manufacturing process becomes more complicated
Solution Approach 1:
The test terminal is formed as an integral part of the fixed contact during the same manufacturing process, combining two previously separate manufacturing steps into one. The fixed contact is manufactured from a copper rail and the test terminal is formed by pressing and punching operations performed on the same workpiece, eliminating the need for separate manufacturing of terminal lugs and fasteners
Solution Approach 2:
The fixed contact structure itself provides the test terminal function without requiring external accessories. The integral design allows the fixed contact to serve its own measurement needs by incorporating the test terminal directly, eliminating dependency on separate components that would require additional manufacturing steps
Data Source
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AI summary
A switching device which comprises: a body (2) which has a first side wall (21) and a first end wall (23), the first side wall (21) being perpendicular in relation to a longitudinal direction, and the first end wall (23) is substantially perpendicular to the first side wall (21); and a first fixed contact (41) comprising an inner section (412) and an outer section (414), the inner section (412) having a thickness dimension, the outer section (414) protrudes from the first side wall (21) in the longitudinal direction. The first fixed contact (41) comprises a test terminal (11) which is integral to the inner section (412) and protrudes from the inner section (412) in a lateral direction, which is perpendicular to the longitudinal direction and an end wall plane defined by the first end wall (23), the test terminal (11) having a substantially planar test terminal surface (115), and the test terminal (11) has a thickness dimension which is parallel to the thickness dimension of the inner section (412), the thickness dimension of the test terminal (11) is substantially smaller than the thickness dimension of the inner section (412), the test terminal (11) is accessible from outside the body (2) from the direction of the first end wall (23), and the test terminal (11) is adapted to be connected to a female connector.