Datasheet
- Datasheet (pdf)
- ApplicationNote (pdf)
Use this for over-voltage protection of any 240VAC device.
See https://www.electronics-tutorials.ws/resistor/varistor.html.
See https://en.wikipedia.org/wiki/Surge_protector.
See https://forum.mysensors.org/topic/1607/safe-in-wall-ac-to-dc-transformers/2
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