Busbar Switch Fuse Layout With Insulating Interlayer for Narrow Width
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Solution Overview
Problem
There is a need for a switching device that can be mounted on a busbar system with minimal width while still adhering to strict safety regulations, such as those outlined in the US-American standard UL 98 for enclosed and dead-front switches.
Innovation Solution
The switching device features a housing with an upper and lower part, including at least two fuse-receiving spaces arranged in a row along the longitudinal direction. An electrically insulating intermediate part, made from a heat-conducting plastic material, is bonded to the housing via a substance-to-substance bond, enhancing clearance and creepage distances to achieve a compact design while meeting safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the width of the switching device is reduced to save space in the switching cabinet, then the space utilization is improved, but the clearance distances and creepage distances required by safety regulations cannot be fulfilled
Solution Approach 1:
The patent transitions from a conventional horizontal arrangement of fuse holders to a longitudinal arrangement along the depth direction of the housing. This dimensional change allows the fuse holders to be positioned at different depths rather than side-by-side, thereby reducing the width while maintaining required clearance and creepage distances through the insulating intermediate part.
Solution Approach 2:
An electrically insulating intermediate part is introduced between the upper and lower housing parts. This intermediate part serves as a mediator that provides the necessary electrical insulation and maintains clearance distances, enabling the housing to be designed with reduced width while still meeting safety requirements for creepage and clearance paths.
2Reliability
If conventional housing structures are used with adequate clearance distances, then safety regulations are met, but the width of the switching device becomes too large for efficient space utilization
Solution Approach 1:
Instead of increasing width to provide adequate clearance distances, the patent utilizes the depth dimension by arranging fuse holders longitudinally. The insulating intermediate part extends in the depth direction, providing necessary insulation without increasing width, thus meeting safety requirements while optimizing space utilization.
Solution Approach 2:
The insulating intermediate part is strategically positioned between specific power-carrying parts (fuse holders) to provide localized insulation where needed. This allows the housing width to be minimized in non-critical areas while maintaining adequate insulation distances in critical areas where electrical components are positioned.
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
The solution allows for a significantly reduced width of the switching device, enabling more devices to be mounted per meter compared to conventional designs, while ensuring compliance with stringent safety regulations.
Implementation Method 1
an electrically insulating intermediate part, made from a heat-conducting plastic material
Implementation Method 2
bonded to the housing via a substance-to-substance bond
Implementation Method 3
bonded to the housing via a substance-to-substance bond
Data Source
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AI summary
The invention provides a switching device (1000) as well as method for manufacturing such a switching device (1000). The switching device (1000) comprises: a housing (100) comprising an upper housing part (110) and a lower housing part (120); at least two fuse-receiving spaces (250-i) for fuse holders (210-i), each for an electrical fuse (270-i), wherein the at least two fuse-receiving spaces (250-i) are arranged in a row along a longitudinal direction (L) along a longitudinal extent of the switching device (1000); an electrically insulating intermediate part (300) arranged between the upper housing part (110) and the lower housing part (120), which is at least partially bonded to the housing (100) via a substance-to-substance bond.