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The distribution box is assembled on the closed or semi enclosed metal cabinet or the screen of the switch device, the measuring instrument, the protective electric appliance and the auxiliary equipment according to the requirement of the electric connection. Manual or automatic switch on or break off circuit is available for normal operation. Fault or abnormal operation with the aid of the protection of electrical appliances to cut off the circuit or alarm. By measuring instrument can display a variety of parameters in operation, but also for some electrical parameters to adjust, to deviate from the normal working state of the signal or signal.