Albright make hundreds of different relays for industrial use.
AFAIK, they were approached to make a unit to replace the solenoid pack for electric winches used on 4x4's, and came up with 2 units. One for 12 volt and another for 24 volt.
Those are the only 2 options (12V or 24V), unless their range has changed (which I doubt). I suspect if you are looking where there are different ratings, you may be looking at the wrong relays.
I don't think either are listed on the Albright web site (I couldn't find them there when I last looked). Normally they are bought from retailers of 4x4 equipment. I bought mine from Gigglepin in UK.
I never suggested replacing the whole set if one solenoid is faulty. I would only replace the faulty solenoid if you can get a replacement.
Edit: Contactors are parts that carry the current. They consist of 2 (or more) parts that make contact to complete a circuit (to allow current flow), or open to break the circuit (stop current flow). Contactors are made from copper and the better ones are plated with expensive metal (e.g. silver) to prevent corrosion from the arc that jumps across when they are in close proximity during switching. The rating is in relation to the current capacity - they need to be larger for continuous current flow, and can be smaller if they are only closed for a short period (when less heat needs to be dissipated).
To minimise arcing (which is bad for the contactors) they must open and close quickly (there is more involved for industrial and high voltage switching). This is the job of the solenoid.



				
				
				
					
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