Why would you want a 50 amp supply? Caravans and motorhomes use the low voltage for lighting The fridge usually works on gas/ 12v/ mains voltage. The 12 volt is used to power the fridge when travelling and not when parked up.
A replacement power supply unit can be got on ebay. www.ebay.co.uk/b/Caravan-Power-Supplies/bn_7024954765
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