These two-speed asynchronous motors are available from RAVEL srl in a complete range of up to 160 mec size, available both in single winding single voltage version with speed ratios of 1:2 type 2/4 or 4/8 poles etc. as per the data sheets below, and two-speed motors RDW Series with separate windings with speed ratios other than 1:2 type 2/4 or 4/8 poles 6/8 poles etc.