CYM6EL electronic adjustable molded case leakage circuit breaker is suitable for AC 50Hz (or 60Hz), with a rated insulation voltage of 800V, a rated working voltage of 400V, and a rated working current of 630A (800A) for infrequent switching and infrequent starting of motors. The circuit breaker has overload, short circuit and undervoltage protection functions, which can protect the line and power equipment from damage; at the same time, it can provide indirect contact protection for people, and can also provide protection for fire hazards caused by long-term grounding faults that can be detected by the overcurrent protection unit. When other protection devices fail, the NAM1L leakage circuit breaker with a rated residual operating current of 30mA can directly provide additional protection. According to its rated ultimate short-circuit breaking capacity, the circuit breaker is divided into two types: M type (higher breaking device) and H type (high breaking type four-pole without H type). The circuit breaker has the characteristics of small size, high breaking capacity, short flying fox, and vibration resistance. The circuit breaker can be installed vertically (i.e. vertical installation) or horizontally (i.e. horizontal installation). The circuit breaker has the function of isolating