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, ThreeLeviton MS303-DSS Manual Motor Controller, 30 A, 600 V, 3P, Non-Grounding, Short Toggle, MS Series is available to buy in increments of 1