... (10,11,12) is suitable to the coal mine well with mixed gas containing methane. In the power supply system of 50 Hz ... and others;With functions of fault check, fault memory;Configured in the RS485 system of mining power automatic control and comprehensive Monitoring ... power of 4KVA/127V(220V).Technical Data TypeQJZ1-2000/1140,660-8,9,10,11,12StructureContactor: the control box is type of ...