A relay is a switch that is electrically operated and it consists of a set of input terminals and another set of operating contact terminals. Now that you know what it is, the question is — why do people use a digital timer relay?
Well, if you need to control a circuit with a low-power source, then a digital timer relay will come in handy. Also, if you need to control multiple circuits at the same time — digital timer relays are the way to go. Most often, you can trigger a time relay by:
– Opening or closing a trigger signal
– Applying an input voltage
Of course, you can use them for commercial, industrial, and residential purposes. Some of the settings you’ll find on your digital timer relay are:
– Delayed start
– Delayed stop
– Cycle settings
– Pulse delay relay.
There are four main types of digital time relays:
Here, the contact is normally open while the coil is unpowered. When you apply power to the coil, the contact will close.
Similar to the previous type, the contact is open while the coil is unpowered. But unlike the NOTC contact, here the timing action will happen upon de-energizing the coil.
When the coil is unpowered, the contact is closed. After you’ve applied power to the coil for a specific amount of time, the contact will open.
Just like the previous type, the contact is not open when the coil is unpowered. But the timing action will occur when the coil is de-energized.
Digital timer relays are most often found in engine auto-start controls and flashing light controls. What’s more, you can use digital timer relays for furnace safety purge controls and motor soft-start controls. For example, you should vent your furnace of any potentially flammable gasses before you can re-light it. To do so, you can use a digital timer relay to control when the vent starts working and how long it works.