Establishments primarily engaged in manufacturing relays; motor starters and controllers; and other industrial controls and control accessories. Establishments primarily engaged in manufacturing automatic temperature controls are classified in Industry 3822, and those manufacturing industrial process control instruments are classified in Industry 3823.
- Armature relays
- Control circuit devices: magnet and solid-state
- Control circuit relays, industrial
- Controls and control accessories, industrial
- Controls for adjustable speed drives
- Crane and hoist controls, including metal mill
- Electromagnetic brakes and clutches
- Industrial controls: push button, selector switches, and pilot
- Marine and navy auxiliary controls
- Motor control accessories, including overload relays
- Motor control centers
- Motor controls, electric
- Motor starters, contactors, and controllers, industrial
- Numerical controls
- Relays
- Rheostats, industrial control
- Solenoid switches, industrial
- Timing devices, mechanical and solid-state, except clockwork
- Truck controls, industrial battery
- Vacuum relays