It is fitted with a main circuit breaker of 380V 250A, and divided into one circuit (with one air switch and one leakage protector) with 160A four-pole leakage protection and four circuits (each with one air switch and one leakage protector) with 100A four-pole leakage protection. For this product, the capacity of electrical equipment in the 160A branch circuit shall not exceed 50KW, the capacity of electrical equipment in the 100A branch circuit shall not exceed 30KW, and it is applied in construction sites where the total power consumption capacity is no more than 120KW.