How do the instantaneous contact and delay contact of time relay act?

Instantaneous contacts are power-off delay time relays. On the contrary, when the input signal is obtained, the execution part immediately has an output signal. However, after the input signal disappears, the relay needs a certain delay to return to the state before the action.

The delay contact is a kind of time relay with power-on delay, which starts to delay immediately after receiving the input signal, and only after the delay is completed does its executive part output a signal to manipulate the control circuit; When the input signal disappears, the relay immediately returns to the state before the action.

For electrified time delay relay, when the coil is electrified, the electrified delay contact acts after a delay time (normally closed contact is disconnected and normally open contact is closed), and the contact immediately returns to normal after the coil is powered off; For the time relay with power-off delay, when the coil is energized, the contact with power-off delay will act immediately (normally closed contact is disconnected, normally open contact is closed), and after the coil is powered off, the contact will return to normal after the delay time.

Extended data

There are many kinds of time relays, mainly air-damped, electromagnetic, electric and electronic.

1, air damping time relay, also called airbag time relay, delays according to the resistance caused by air compression. Its structure is simple, its price is cheap, its delay range is large (0.4 ~ 180s), but its delay accuracy is low.

2. Electromagnetic time relay has a short delay time (0.3 ~ 1.6s), but its structure is relatively simple, and it is usually used in power-off delay occasions and DC circuits.

3. The principle of electric time relay is similar to clocks. It is delayed by the rotation of the reduction gear driven by the internal motor. This relay has high delay precision and wide delay range (0.4 ~ 72h), but its structure is complex and expensive.

4. Electronic time relay, also known as electronic time relay, uses delay circuit to delay time. The relay has high precision and small volume.