HKM1 series plastic case circuit breakers are mainly used for 50 Hz (or 60 Hz) AC, 800V rated insulation voltage, 690 V rated working voltage and below, 1600 A rated current distribution network as overload, undervoltage and short circuit protection of distribution power and protection lines and power supply equipment, 400A shell level circuit breakers, also as overload, undervoltage and short circuit protection of motors. Under normal circumstances, it can be used for the infrequent switching of lines and the infrequent starting of motors.

HKM3 series plastic case circuit breakers are mainly used for 50 Hz (or 60 Hz) AC, 800V rated insulation voltage, 690 V rated working voltage and below, 630 A rated current, and overload, undervoltage and short circuit protection of distribution power and protection lines and power supply equipment in distribution networks below. Circuit breakers below 400A shell level can also be used for overload, undervoltage and short circuit protection of motors. Under normal circumstances, it can be used for the infrequent switching of lines and the infrequent starting of motors.

HKM1LE 系列塑料外壳式漏电断路器（以下简称断路器），其额定绝缘电压为 800V，适用于交流 50Hz，额定工作电压 400V，额定工作电流从 16A 至630A 的电路中作不频繁转换及电动机不频繁起动之用。

hkm1e series electronic plastic case circuit breaker (hereinafter referred to as circuit breaker) is suitable for ac 50hz (or 60hz), with rated insulation voltage of 800v, rated working voltage of 690v and below, infrequent switching and infrequent starting of motor in the circuit with rated working current of 800a.