What are the precautions for the use of relays?

Update:14-07-2021
1. Rated working voltage: refers to the voltage required by the coil when the relay is working normally. Depending on the model of the relay, it can be AC ​​voltage or DC voltage.

2. DC resistance: refers to the DC resistance of the coil in the smart home relay, which can be measured by a universal meter.

3. Pull-in current: refers to the minimum current that the relay can produce a pull-in action. In normal use, the given current must be slightly larger than the pull-in current, so that the relay can work stably. As for the working voltage applied to the coil, generally do not exceed 1.5 times the rated working voltage, otherwise it will generate a larger current and burn the coil.

4. Release current: refers to the maximum current that the relay generates to release the action. When the current in the pull-in state of the relay is reduced to a certain extent, the relay will return to the release state without power. The current at this time is much smaller than the pull-in current.

5. Contact switching voltage and current: refers to the voltage and current that the relay is allowed to load. It determines the magnitude of the voltage and current that the relay can control, and this value cannot be exceeded during use, otherwise it is easy to damage the contacts of the relay. Use technology; means that the coil in the relay will generate a very high reverse electromotive force when it loses current, which can easily damage the electronic devices that control it. In the use process, it is important to consider the introduction of absorption circuits in the design of the circuit.
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