Electromechanical relays are devices that complete or interrupt a circuit by physically moving electrical contacts into contact with each other

Time delay relays and solid state timers use solid state electronic devices to provide a time delay

Relay sockets are devices that accept relays, electromechanical switches in which the variation of current in one electric circuit controls the flow of electricity in another circuit

Electromechanical counters and electromechanical timers accept inputs to operate mechanical display, such as rotating wheels or knobs

Motor contactors are relays with large current capacity for connecting and disconnecting a motor from the power supply.

Motor starters and contactors are motor-starting devices.

Electronic counters and electronic timers are completely electronic units for performing a variety of counter or timer functions.