To check operation of air break.

检验空气开关节点的工作状况。

When supply pressure drops to atmospheric, air break must relieve pressure between both checks.

当供应压力下降到大气压力时, 空气开关节点必须释放两个止回阀之间的压力.

Many elements such as models of fuse plug and circuit breaker, the connecting terminal of inlet and outlet wire and air break switch can be installed in the meter box.

箱体内可装配各种型号熔断器、断路器开关，进出线接线端子、空气开关等元件。