The type of timer selected depends on the specific requirements of the application and the function the timing device needs to perform. Likewise, the choice of timer model is determined by the operating modes required, such as ON-delay, OFF-delay, interval, or cyclic operation, as well as factors like accuracy, range, and environmental conditions.

Timers operate as part of a control system and require an input device, such as a proximity sensor or limit switch, to initiate the timing sequence. Once triggered, the timer (whether digital or analogue) processes the input signal and begins counting according to its configured mode and preset value. After the set time has elapsed, the timer provides an output signal, which can be used to control other devices such as relays, motors, or PLC inputs, ensuring the desired sequence or delay is achieved.

*Some timers have been discontinued and some have been released since this