Not uncommon rubbish instructions from device vendors.
My pond pumps came (last year) with instructions written when the 2005 notification rules were still in place - so incorrectly said things about the law regarding outside installations. They also said they must be hard-wired and not use a plug - which I suspect is another "what we think the law says" thing.
At 4W (or 10W for mine), it's going to be hard to find a fuse that will protect the motor - and in any case, if it blows then it's almost certain that the motor is already dead. So a 2A fuse will be just fine, and the plug-in RCD will be too as long as it is suitably protected from weather.
... My pond pumps came (last year) with instructions written when the 2005 notification rules were still in place - so incorrectly said things about the law regarding outside installations.
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