добыча взрывозащищенные и внутренне безопасности ти

mining explosion-proof and intrinsically safety type vacuum combination switch, In the power supply system with rated voltage 1140V(660V) ,AC 50Hz ,it can control and protect the start or stop of three-phase squirrel-cage asynchronous motor, and can change the phase sequence after the motor stops. The product features contains a. using instrinsically safety type processor to control circuit ,it can prevent and control short circuit or spontaneous accidents caused by earth fault. b. the functions of combination switch adopts Simens PLC ,the industrial computer takes a real-time monitoring to system ,the self-developed application software is flexible to operate, applicable to two-speed dual-drive,two-speed single-drive ,program-controlled ,indepent non-program-controlled ,two-speed single-drive plus independence. c.drawer structure for independent protection ,easy and convenient to maintain .