ms303Leviton MS303-DSS Manual Motor Controller, 30 A, 600 V, 3P, Non-Grounding, Short Toggle, MS Series is available to buy in increments of 1Part #: MS303. Download. File Size: 136Kbytes. Page: 2 Pages. Description: 3.0A SCHOTTKY BARRIER DIODE. Manufacturer: Zibo Seno Electronic Engineering