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-DS 30 Amp 600 Volt, Three-Pole, Three Phase AC Motor Starter, Suitable as Motor Disconnect, Toggle, Industrial Grade, Non-Grounding, Black - Wall