MS37TB-20-1B is a Marathon adjustable speed drive. This drive is designed for versatility, convenience, and flexibility, allowing for voltage ratings of up to 480 volts, horsepower stages of up to 200 HP, and the ability to operate on single and three phase power. The drive also features soft start and stop control, built in overload protection, PID control capabilities, and flexibility in selecting six factory-set frequencies or user-defined settings. All these features combine to create a powerful, reliable adjustable speed drive that’s perfect for a variety of applications.