In this video, we are going to introduce how to use the time relay GRT8-Bt. This time relay has two sets of contacts.
One set is delay contacts, the other is instantaneous contacts.
Check this video to see how it works.
This time relay is used for on/off delay of the circuit, controlling the power-on time of the heating element, the working time of the water pump, and the off delay of the fan.

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