Leviton MS303-DS 30A 600V Three-Phase AC Motor Starter | Industrial Grade, Non-Grounding

Overview

The Leviton MS303-DS is built for environments where operators rely on dependable, manual control of heavy motor loads. This 30 Amp, 600 Volt unit uses a three-pole, three-phase configuration and can function as a motor disconnect in addition to on-off switching. The non-grounding design keeps wiring arrangements flexible, and the compact form fits into standard control boxes. The durable construction is finished in black for a professional, industrial look and long-lasting visibility under operator lighting.

Key benefits

• Provides safe, repeatable ON/OFF control for conveyor belts, pumps, HVAC loops, and air compressors
• Rugged industrial-grade reliability designed for continuous operation
• Compact footprint that fits standard wall boxes for easy retrofits
• Back or side wiring compatibility with terminal clamps or ring terminals
• Oversized toggle offers clear actuation feedback and reduces operator uncertainty
• Nickel-plated #10 triple-combination screws improve corrosion resistance
• Non-grounding design supports flexible system configurations
• Well-suited as a motor disconnect in busy machinery rooms

Installation and durability

• Built with high-quality materials and Leviton's manufacturing standards for durable performance
• Non-grounding design designed for ease of integration in mixed electrical systems
• Corrosion-resistant hardware helps maintain reliable connections in challenging environments
• Oversized toggle handle provides tactile feedback even with work gloves

Real-world use scenarios

In bottling lines, this starter can be used to quickly isolate a line for maintenance without shutting down related equipment. In pumping stations, it offers a straightforward method to start or stop pumps during routine service. HVAC loops and air compressors benefit from predictable control that minimises nuisance starts. In large manufacturing floors, technicians value the ability to connect with common wiring methods and to mount the controller in standard boxes without reworking the panel cutout. While not a guarantee of outcome, the MS303-DS helps create clear, controlled motor handling in demanding settings.