Basic type has follow functions **** Full-automatic: i.e. Auto-switch-in, auto-restoring. When Normal power is off, switch will transfer to reserve power automatically;when Normal power is normal, switch will transfer to Normal power. ***** Compulsory "0": Under urgent situation or device examination,push compulsory "0" self-lock button,switch will transfer to position "0" to cut off both normal power and reserve power. Fire control type has follow functions ***** Full-automatic: i.e. Auto-switch-in, auto-restoring. When Normal power is off, switch will transfer to reserve power automatically;when Normal power is normal, switch will transfer to Normal power. ***** Compulsory "0": Under urgent situation or device examination,push compulsory "0" self-lock button,switch will transfer to position "0" to cut off both normal power and reserve power. ***** With generator: when normal power cut off, send out the starting signal of generator, to make generator starting automatically.When normal, the switch will transfer to generate electric automatically.When normal power comes normal, the switch will turn to normal power automatically.Meanwhile send out closingsignal of generator, thus closed generator. ***** Remote control: i.e. operation and control at long distance. Push button , normal power will work; push button "",then reserve power will work. ***** Lack phase examination and protection: exam and protect breaking of any phase of normal power and reserve power.