... signal; 3)CE/CCC/ISO certificates 3Phase Automatic or Manual Transfer Switches for Generator1)rated voltage:AC220,380,400,440,660V ... ,rated frequency50/60Hz and 250VDC.the applied places like fire control, postal communication, hospital, hotel, urban rail transport, high-rise ... controller is 220VAC of main and backup power, no extra control power.Parameters: rated current(A)32working current(A)3. ...