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How do you wire a time delay relay? Is one enough?


Hey there, when designing circuits using time delay relays may have questions such as "how do you wire a time delay relay?". For Example, In a circuit, the motor delays start-up until three seconds after the switch is thrown to the “Run” position, but will stop immediately when the switch is returned to the “Stop” position. What does the normal status of an electrical relay refer to? Specifically, what is the difference between a normally-open contact and a normally-closed contact of timer relay? or How do you wire a time delay relay based on the mentioned questions before. Some notes said "If you are using an on delay relay, the delay will start immediately after the input signal is obtained. After the delay is completed, the executive part will output the signal to the control circuit. When the input signal disappears, the relay will immediately return to the pre-action status. It is opposite to an off delay relay." (source from Time Delay Relay Basics). Is there a specific and popular explanation of it?


New member
As far as the contact itself is concerned, except for the difference in contact current and contact materials, there is no difference. It has nothing to do with whether it is a time relay or an ordinary relay, and whether it is a normally open or normally closed contact.
Time relay and ordinary relay are different in working mode.
The normally open and normally closed contacts of ordinary relays act immediately after power-on, and the contact status is reversed. The normally open and normally closed contacts of the time relay will act after the energization delay, which is divided into power delay and power-off delay.
BTW, the source you mention actually explains this question in detail. Maybe you should finish reading.