The Conveyor Components Company (CCC) CMS-1G Motion Switch is a compact, direct-drive control device engineered to monitor the rotational speed of equipment such as belt conveyors, bucket elevators, rotary feeders, and screw conveyors. It is designed to detect under-speed, over-speed, or zero-speed conditions, providing essential protection against equipment failure due to lack of rotation.
Key Features
- Versatile Speed Detection: Capable of monitoring under-speed, over-speed, and zero-speed conditions to ensure optimal equipment performance.
- Dual Circuit Control: Equipped with a double pole double throw (DP/DT) relay, allowing control of up to two separate circuits for machinery shutdown and alarm activation.
- Rugged Enclosure: Housed in a cast aluminum enclosure rated NEMA Type 3S, 4, and 4X, offering weatherproof and corrosion-resistant protection.
- Flexible Mounting: Designed for direct coupling to rotating equipment via a stub shaft and flexible coupling, with the ability to operate in both clockwise and counterclockwise directions.
- Adjustable Time Delay: Features a built-in adjustable time delay to eliminate the need for a separate startup delay, enhancing operational efficiency.
Technical Specifications
- Power Input: 120 VAC
- Relay Output: Dry, unpowered DP/DT relay rated for 3A at 120V AC, 3A at 30V DC, and 1/10 HP at 120V or 240V AC
- Operating Temperature Range: -10°C to 55°C (14°F to 131°F)
- Maximum Operating Speed: 1000 RPM
- Ingress Protection: IP65 compliant
- Certifications: cULus Certified
The CMS-1G Motion Switch is an essential component for safeguarding rotating equipment, ensuring operational safety, and preventing potential damage due to rotational inconsistencies.

















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