Dual Power Automatic Transfer Switch, Disconnector manufacturer / supplier in China, offering 3-Pole Knife Switch 400A Circuit Breaker Switch Three-Phase Three-Wire Single-Pole Switch Open-Type Circuit Breaker with Thickened Copper Blade, Single-Phase Knife Switch HD11f-200/28 Single-Pole Isolating Switch 2p 2pole Thick Copper Knife Switch 200A, Single-Phase Knife Switch HD11f-100/28 Single-Pole Isolating Switch 2p 2 Pole Thick Copper Knife Switch 100A and so on.