The protection appliance has a wedge-shaped fixture block with a side surface similar to a right-angled triangle;

它有一个侧面近似 为直角三角形的楔形卡块；

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Meanwhile, the wedge-shaped design of the fixture block can play the role of self-locking, and thus causing the moving and static contacts to be steadily contacted.

同时，卡块的楔形设计能起到自锁的作用，使动静触头能够稳定接触。

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