... circuit of 50~60Hz, voltage up to 500V. 1.Application BK series machine tool control transformer is suitable for circuit of ... lightings and indicator lamps. 2.Structure characterAccording to different structures, BK transformer belongs to shell type, and according to the installation ... for installation(mm) Installation hole (mm)K x JBmaxDmaxEmaxA C BK-50 76768361±0.454±35 × 12BK-100 849210070±0.460 ...