Manufactured in the USA, DAZIC zero speed switches from Control Concepts, Inc. (Putnam, CT) reduce downtime, protect expensive equipment and safeguard operations by monitoring the rotary motion of equipment when interlocked as part of conveyor systems or other shaft-driven process components. The switches provide an instant alert or relay throw if rotation stops or deviates from standard operating parameters, stopping the entire conveyor system until the problem situation is corrected, which prevents a time-consuming pile-up of material or an unsafe situation. The Model 2100 series, Model 4100 series and Model 8100 series of electromechanical switches are manufactured from aluminum or cast iron with a NEMA 4/4x rating with SPDT, DPDT or SPDT(s) wiring contact options. These switches detect changes in motion from 0.5 RPM up to 2000 RPM. Explosion-proof models constructed with a high-strength cast aluminum alloy housing with a NEMA 7/9 rating are also available for use in hazardous environments.