The KBMM™ full-wave variable speed DC motor controls, now with SMT construction, offer the user the ultimate in reliability and performance at an affordable price. The controls contain a unique, super fast, Direct-Fed™ current limit circuit that helps to protect the SCR power bridge against direct shorts 2. The reliability of the KBMM™ is further enhanced with the use of high-surge, 25A SCRs and AC line and armature fusing 5. The KBMM™ is fitted with KB’s exclusive Plug-in Horsepower Resistor® 5 . It eliminates the need for recalibrating IR Comp and Current Limit when the control is used on various horsepower motors. In addition, the rating of the control can be extended to 1-1/2 HP at 115V and 3 HP at 230V by the use of KB’s auxiliary heat sink. Models KBMM225 and KBMM-225D also allow operation of 90 VDC motors when used on 230 VAC line input.