The on-delay timer relay is used in a broad range of applications today, from the lighting systems of buildings to HVACs and industrial machinery. If you’re unfamiliar with the device, continue reading to learn about its function, how it works, and some of its most popular uses.

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An on-delay time relay is a timing device that keeps contacts open or closed until the preset time has elapsed. After that, the contacts will close or open, thereby energizing or de-energizing the output. The time period for delay starts when an input voltage is applied to the device. Most on-delay timing relay circuits have an internal coil that must be energized before the timing period can start. They can also be solid state timers and only use semiconductors to produce the timing and circuit closing actions during use. Regardless of if a timing relay is electromechanical or purely electronic, they all have a set of input and output terminals. The input terminal is where the voltage must be applied in order to start the timing function. The output terminals are what supply power to the device or system being controlled by the relay.