Motortronics VMX-S series soft starters are designed for lighter duty loads (like many pumps, fans and blowers) where a soft starter rated at 350% for 30 seconds is more than adequate. Same great performance features and accessories you would find in the "Heavy Duty" offering, only supplied with a shunt duty rated integral bypass contactor instead of a line rated contactor. A cost-effective and reliable motor starting solution for standard duty applications.