Fuse Module Ampacity Rejection Using Slot and Terminal Configuration
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Solution Overview
Problem
Conventional fuse modules lack the ability to selectively reject fuses with higher ampacity, potentially leading to overcurrent issues that can damage electrical circuits or pose safety risks, and they rely on user discretion for proper ampacity matching, which can result in inadequate or excessive overcurrent protection.
Innovation Solution
The design of fuse holders and fuses with specific ampacity ratings, where the configuration of fuse terminals and slots ensures that only fuses with the correct or lower ampacity are accepted, preventing fuses with higher ampacity from being installed, through a combination of size and location adjustments of the terminals and slots, and potentially using offset configurations to enhance compatibility and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fuse modules accept multiple fuses regardless of ampacity, then ease of operation is improved, but safety deteriorates due to risk of incorrect ampacity installation
Solution Approach 1:
The fuse holder performs self-service by automatically rejecting fuses with higher ampacity through its slot configuration. The slot dimensions are designed to physically accommodate only fuses with appropriate ampacity ratings, eliminating the need for user judgment and ensuring safety through self-enforcing mechanical constraints.
Solution Approach 2:
The slot configuration acts as an intermediary between the fuse holder and fuse. It mediates the interaction by providing a physical interface that allows proper fuses to be installed while blocking improper ones, translating the abstract concept of ampacity compatibility into concrete mechanical compatibility.
2Device complexity
If fuse holders use only size-based rejection, then device complexity is reduced, but measurement precision deteriorates because ampacity cannot be accurately verified
Solution Approach 1:
The slot configuration applies local quality by varying the dimensions of specific slots to correspond to specific ampacity ratings. Each slot has tailored dimensions (width, length, orientation) that locally match the terminal characteristics of fuses with the appropriate ampacity, enabling precise ampacity verification through localized geometric features rather than uniform size-based rejection.
3Reliability
If fuse terminals are configured for precise ampacity matching, then reliability is improved, but device complexity increases due to multiple terminal configurations
Solution Approach 1:
The slot configuration employs asymmetry to encode ampacity information. Slots are designed with asymmetric dimensions and orientations that create a unique geometric signature for each ampacity rating. This asymmetric design allows the system to distinguish between different ampacities using simple geometric variations rather than complex multi-component configurations, achieving reliable ampacity matching with minimal complexity.
Data Source
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AI summary
A fuse and fuse module that facilitate ampacity rejection based on electrical contact location is disclosed. A configuration of electrical contacts in the fuse and a corresponding configuration of fuse slots in the fuse holder permit fuses within an acceptable range of ampacities to be installed in the fuse holder while at the same time preventing fuses within an unacceptable range of ampacities from being installed in the fuse holder.