ZMM3E系列系列电子式塑料外壳式断路器(以下简称断路器)，适用于交流50Hz(或 60Hz)，其额定绝缘电压为800V，额定工作电压690V及以下，额定工作电流至800A的电路中作不频繁转换及电动机不频繁起动之用。断路器具有过载长延时反时限、短路短延时反时限、短路短延时定时限、短路瞬时和欠压保护功能以及剩余电流保护(可选)，缺相保护功能(可选)，能保护线路和电源设备不受损坏，断路器保护特性齐全、精确，能提高供电可靠性，避免不必要的停电。

断路器按照其额定极限短路分断能力，分为M型(较高分断型)、H型(高分断型)二种。该断路器具有体积小、分断能力高、飞弧短、抗振动等特点。

断路器可垂直安装(即竖装)，亦可水平安装(即横装)。

断路器具有隔离功能，其相应符号：“     /   l   X   ”。

断路器不可倒进线，即只允许1、3、5接电源线2、4、6接负载线。

The ZMM3E series electronic plastic-enclosed circuit breakers (hereinafter referred to as "circuit breakers") are designed for AC 50Hz (or 60Hz) applications, with a rated insulation voltage of 800V, a rated operating voltage of 690V or lower, and a rated operating current up to 800A; they are suitable for use in circuits for non-repeated switching operations and non-repeated motor starting. These circuit breakers feature overload protection with long-time inverse-time characteristics, short-circuit protection with short-time inverse-time characteristics, short-circuit protection with short-time timelimit characteristics, short-circuit instantaneous protection, under-voltage protection, as well as residual current protection (optional) and phase-loss protection (optional). They can protect electrical circuits and power equipment from damage, offering comprehensive and precise protection characteristics that enhance power supply reliability and prevent unnecessary power outages.

Circuit breakers are classified into two types—M-type (high interrupting capacity) and H-type (high interrupting capacity)—based on their rated maximum short-circuit breaking capacity. These circuit breakers

feature a compact size, high breaking capacity, short arc duration, and excellent vibration resistance. 

Circuit breakers can be installed vertically (i.e., upright installation) or horizontally (i.e., horizontal installation).

The circuit breaker has an isolation function; its corresponding symbol is: “     /   l   X   ”。

The circuit breaker cannot be configured for reverse wiring; specifically, only terminals 1, 3, and 5 may be

connected to the power supply lines, while terminals 2, 4, and 6 may be connected to the load lines.