Rob, I'm near 100% sure VPA stands for Vehicle Power Adapter (and not Variable Power Adapter). A VPA plug can go into either automotive cigarette lighter sockets or ones specifically designated as a VPA.
The Dometic plug for my fridge is the same as as in the picture with the ARB socket (technically a VPA). I think the standards have changed to where everything we remotely identify as an automotive cigarette lighter is strictly considered a VPA as vehicles no longer come with the ability to accommodation the lighter piece. (For around the past 15 years)
The design was never intended to power 12-Volt accessories, but it grew into it by necessity and has been successful only because of the lack of something else better.
An "ARB" style plug is far superior. I'm sure that there's an engineering group designation, but I'm not aware of it.
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 Rich and Lynn: 2021 2922KB
420Ah LiFePO4 battery bank, kilowatt solar, 3K Watt Pure Sine Wave Inverter, DC-to-DC Charger, Sealand 711-M28 toilet, Maxxis 8008 Load Rated E
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