断路器室在柜体下部，并设有压力释放通道。
Breaker room in the lower part of the circuit breaker, with the release of pressure on the channel.
使用时将断路器操动机构的能量首先全部储存在扭力弹簧中，再分三次释放出来。
First, the energy of the operating mechanism of the breaker is all stored in the torsion spring and then released in three divided times.
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