ms303LEV-MS303-DS. Mfr. Model # MS303-DS. Skip to the end of the images gallery . Skip to the beginning of the images gallery . Product Description. 30 Amp, 600V, Three-Pole, ThreeDescription Leviton, MS303-DS, AC Motor Starter Switch, Industrial Grade Manual Non-Grounding, 600 VAC, 30 A, 20 hp Power, TPST Contact Confuration, 30 A at 600