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AC85-265V 12W E27 Incorporado Batería 1200mAh Corriente constante Blanco puro LED Bombilla de emergencia para uso doméstico
10,65€ 11,06€

Q: How does this differentiate a power failure from the wall switch being turned off???

Preguntado por Alferboy sobre 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.

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