... ) is suitable to the coal mine well with mixed gas containing methane. In the power supply system of 50 Hz AC, rated ... , operation status, loop on-line status,insulation status, fault type and others;With functions of fault check, fault memory;Configured in the ... device: quick plug, presser-plate optional;It can supply illumination power of 4KVA/127V(220V).Technical Data TypeQJZ1-2000/1140,660 ...