... 60Hz, voltage up to 500V. 1.Application BK series machine tool control transformer is suitable for circuit of 50~60Hz, voltage ... up to 500V, usually applied as power supply for machine tool electrical appliances, local lightings and indicator lamps. 2.Structure ... type, and according to the installation mode, it belongs to vertical type. 3.Working environment 1.Ambient air temperature: -5oC ...