ms303Part #: MS303. Download. File Size: 136Kbytes. Page: 2 Pages. Description: 3.0A SCHOTTKY BARRIER DIODE. Manufacturer: Zibo Seno Electronic EngineeringMS303-DS Industrial Grade Manual Non-Grounding AC Motor Starter Switch, 600 VAC, 30 A, 20 hp Power Rating, TPST Contact