Fuse Arc-Suppressing Coating for Higher Breaking Capacity
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Solution Overview
Problem
Conventional fuses often experience electrical arcs during overcurrent conditions, which can lead to rupture of the fuse body and potential damage to surrounding components, limiting their breaking capacity.
Innovation Solution
The implementation of a fuse design that incorporates a mixture of sand, an arc suppressant, and a flame retarding binder as an arc suppressing material, which is applied to the fusible element and terminals. This material quenches electrical arcs and absorbs heat through endothermic reactions, thereby enhancing the fuse's breaking capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fuse design is used, then the fuse structure is simple and cost-effective, but electrical arcs during overcurrent conditions can cause fuse body rupture and limit breaking capacity
Solution Approach 1:
The patent applies composite materials by coating the fusible element with a multi-component material consisting of sand (silica), arc suppressant (such as potassium hydroxide or lithium hydroxide), and flame retarding binder. This composite coating combines the arc-quenching properties of sand, the chemical arc-suppressing properties of hydroxides, and the binding properties of the flame retarding agent, creating a synergistic effect that suppresses electrical arcs and prevents fuse body rupture while maintaining structural simplicity
Solution Approach 2:
The arc suppressing material acts as an intermediary substance between the fusible element and the surrounding environment. When the fusible element melts during an overcurrent condition, this intermediate coating material suppresses the electrical arc that would otherwise propagate through vaporized particulate, preventing the arc from heating and potentially rupturing the fuse body
2Reliability
If arc suppressing material is added to the fuse, then breaking capacity is enhanced, but manufacturing process becomes more complex
Solution Approach 1:
The patent specifies particular parameter ranges for the arc suppressing material composition, including the proportion of sand, arc suppressant, and flame retarding binder, as well as the thickness of the coating layer. By optimizing these parameters, the patent achieves effective arc suppression while maintaining manufacturing feasibility through established coating techniques such as dip coating, spray coating, or screen printing
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 described fuse design effectively mitigates electrical arcs during overcurrent conditions, reducing the likelihood of fuse rupture and enhancing its breaking capacity without significant increases in cost, size, or form factor.
Implementation Method 1
This material quenches electrical arcs and absorbs heat through endothermic reactions
Implementation Method 2
Upon the occurrence of an overcurrent condition in the circuit, the fusible element melts or otherwise opens to arrest the flow of electrical current through the fuse
Data Source
AI summary
A fuse including a fuse body, a fusible element disposed within the fuse body, first and second terminals extending from opposite ends of the fusible element and out of the fuse body, and a quantity of arc suppressing material formed on the fusible element, wherein the arc suppressing material is formed of a mixture of sand, an arc suppressant, and a flame retarding binder.