Frequency inverter that is used to change spindle motor speed from 0-300 or 0-400hz.

Model         Max. current       Wire gauge AWG     Torque kgf-cm
007M43B    4.2A                      12-14                       14
015M43B     5.7A                     12-14                          14
022M43B      6.0A                   12-14                          14
037M43A        8.5A                  8-14                           15