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As a fault current detection device for a hybrid current-limiting fuse, the traditional pure silver arc trigger refused to operate under low overload current, so that low overload fault current detection cannot be achieved. In response to this problem, this article designed and processed a silver tinned arc trigger that successfully breaked under low overload current. Firstly, the working principle of the silver tinned arc trigger was analyzed. Then, according to the principle of electro-tinning, the electroplating process of the silver tinned arc trigger was designed, and the prototype of the silver tinned arc trigger with a rated current of 350A was obtained through electroplating. Finally, under the same experiment conditions, a 2450A low-overload pre-arc experiment was carried out on the silver tinned arc trigger and the pure silver arc trigger respectively. The comparative experiment results found that: the silver tinned arc trigger breaked after 23.3ms of current flow, and the pure silver arc trigger refused to break. On the one hand, it can be seen that the experiment results verify the correctness and reliability of the designed electroplating process, and the obtained silver tinned arc trigger prototype is qualified. At the same time, it also verifies the feasibility of the silver tinned arc trigger to realize the low overload fault current detection function.
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