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AC85-265V 12 W E27 Ingebouwde batterij 1200 mAh Constante stroom Zuivere witte LED-noodverlichting voor thuisgebruik
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Q: How does this differentiate a power failure from the wall switch being turned off???

gevraagd door Alferboy op 2020-01-20 07:16:07

mareklew Other devices connected to grid, including your grid feed transformer, provide a short between the AC contacts. Bulb recognizes that a) there's no AC voltage and b) the contacts have electric path between them and powers on.

2020-01-21 02:15:09 Nuttig (6)
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