GTM1L series Mould case circuit breaker with residual current protection, is one of the new-style breaker developed by our company, which adopt the international leading design and Manufacturing technology. Its rated isolation voltage is 800V, and be suitable for using in AC 50HZ, rated working voltage 400V and below,rated working current to 630A circuit serve as the function of no frequent changeover and less frequent motor starting. The breaker can protect the citcuit and power equipment from over load, short-circuit and underload damage, at the same time, it can prevent the fire hazard may caused by long-time existed earth fault which can't detected by over-current protection .