Manual motor starter switch provide safe, reliable control of a variety of motor loads, Typical applications include manual ON/OFF switching control of bottling lines, pumping machines, air compressors and other heavy manufacturing equipment. These motor controllers are available for both single-phase and three-phase applications, Cam-driven mechanism enhances fast-make/slow-break. Silver- Alloy contacts for maximum conductivity and service life. External clamps accept back and side wiring. Insulating barrier between terminals provide isolation between phases. Backed by a Limited Ten-Year Warranty.