MS497-40 Manual Motor Starter 28 ... 40 A. The MS497-40 manual motor starter is a 70 mm width devices with a rated operational current of Ie = 40.0 A. This device is used to manually switch on and off motors and to protect them reliably and without the need for a fuse from short-circuits, overload and phase failures. The manual motor starter offers a rated service short-circuit breaking capacity Ics = 50 kA at 400 VAC and the trip class 10.