Not the usual boring Relay

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Thought this relay was worth demonstrating, as it uses some extra applied physics in its operation. The relay is designed for DC circuits. With large DC voltages, if an arc forms as a DC circuit opens, it is more difficult to break than for the equivalent AC voltage. This is why you will sometimes see two ratings on a switch one for AC the other for DC. With modern DC circuit in EVs and PV systems it is important to use suitably rated switches.

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Опубликовано:

27 фев 2024

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Комментарии : 3

@peterjameson321 7 месяцев назад

Thanks for an interesting and well described résumé of this relay and the magnetic deflection Kram. My mind turns to coils that were often placed in street lamp luminaries with horizontal mercury arc lamps. The coils were in series with the ballast choke and so produced an alternating magnetic field. This kept the arc which was also conducting AC in the centre of the tube as otherwise it would rise up due to convection currents in the carrier gas and would melt the upper surface of tube resulting in lamp failure.

@tuopeeks 7 месяцев назад

Thanks. Ah yes, the old medium pressure mercury arc lamps. It's impressive enough of a field could be produced at the lamp, with this method, to counteract the convection current.

@niallsommerville9813 7 месяцев назад

Interesting demo. I saw a lot of this type in the marine environment. Most of them had ceramic arc guides on the blow out end to reduce scorching to the holder, they often looked like the thrust vectoring chutes on jet engines, that may explain the additional bolt hole in the casing. I was told by a manufacturer that the ceramic also helped cool the gas and reduce the ionisation created within the starter cabinet. As Peter mentioned, some larger versions had wound coils with a decay circuit in place of permanent magnets.