PA manufactures the Model SS-500 digital speed switch. This conveyor speed sensor may be used to provide 4-20 mA proportional to conveyor speed or relay output for belt under/over-speed (field programmable). The SS-500 speed switch features ease of set-up, will accommodate all belt speed ranges, and can detect small speed changes. An optional tachometer drive assembly is available.

Schulze Manufacturing offers heavy-duty speed switches used on engines, buses, pumps, generator sets, process control, conveyors, off-highway and construction equipment. Features include high inductive load ratings of 15 amps at 6-14 volts DC and 10 amp at 24-30 volts DC. Its AC rating is 15 amps at 110/220 volts AC. These slow, high or standard speed switches offer weatherproof construction.

Avtron offers combinations of Avtron encoders and overspeed switches from Hubble, Leviton, and others. These overspeed combinations are engineered for applications in crane, hoist, mines, and other safety situations. Units provide overspeed protection and speed feedback from one assembly.

Allen-Bradley (Rockwell Automation) provides condition sensing switches and controls required for rotating machinery. These switches provide an electrical contact signal at a determined speed. Features include speed settings from 15 to 1000 rpm, shaft speeds up to 2000 rpm, and a double-shaft seal.

Protocontrol Instruments, based in India, manufactures safety zero speed switches for material handling plants. Switch types include conveyor safety switches, electronic switches and electronic conveyor switches. Applications include cement, fertilizer, steel, mining and power plants.