Will this work to run rv ac off standard 110 ?

I use it on my boat which has only a 110- 120 volt 30 amp Alternating current( AC )inlet receptacle. This adapter allows me to use a 110-120 volt, 20 amp AC ( ie, household current) input if that is the only electrical supply available. If your RV has a 110-120 volt 30 amp AC receptacle with a male prong arrangement exactly like the large female plug pictured and if your air conditioning unit does not need higher wattage than household current can supply ( Watts = volts x amps), then this adapter might work for you. I am not sure if Marine and RV plug prong shapes and arrangements are identical- that might be too rational to expect. Best to compare this photo-to what you see in an RV catalog.

I see that the 30/50 amp side is water resistant with the lock collar but what about the connection to the 15/20 amp? I want to use this in the rain.

It is a standard 15 amp 3 prong plug with no water resistance features...No different from a household extension cord. I have mine in a protected GFI outlet in a weather proof housing on my dock, and I recommend you do the same.

Will this actively prevent the current from going above 15 Amps in the case where an appliance or system tries to draw more power?

No, it is just wires and will flow as much current as possible until it melts down. Your circuit breaker or fuse, supplying the receptacle that this is plugged into, is your current limiting device.

Can I use this to plug in a shot vac to clean my boat?

I have same adaptor, male goes into boat Hubble and female to 110 AC power source. Once this is done, you can then set boat master breaker for AC circuits to ON, then plug shop vac into boat's 110V AC outlet. Assuming you have all of the above, otherwise, no joy.

Item Package Dimensions L x W x H	11.46 x 6.61 x 3.5 inches
Package Weight	0.69 Kilograms
Item Dimensions LxWxH	12 x 7 x 4 inches
Item Weight	0.68 Kilograms
Brand Name	Marinco
Warranty Description	LIMITED WARRANTY
Model Name	Marinco
Color	Yellow
Material	Plastic
Suggested Users	Boating
Number of Items	1
Manufacturer	Marinco
Part Number	104SPP
Style	15a 125v to 30a 125v
Included Components	MARINCO
Size	One Size
Sport Type	Boating

Pigtail Adapters

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