If it is 3 Kw then a more usual 20 amp type will do - and these can be bought in the style of a light switch.
The purpose of this is to isolate the appliance for servicing etc so it should be fitted in the cable feeding the appliance and reasonably close to it.
I think Dave's suggesting that the OP does his learning on jobs that aren't so likely to kill himself and/or others if he hasn't yet learned enough, and that his question indicates a level of inexperience and confusion which suggests that he may get other vital aspects of the job dangerously wrong.
Indeed - The Boy Electrician (1948-1966) recommended reading.
My first attempt to use mains - connected to a transformer (under father's supervision ) resulted in considerable smoke and smell since the transformer was an interstage valve job...
You're right to mention it, but hot tubs I've seen in the U.S. all connect to the 220V supply. Normally 110v circuits are 15A or sometimes 20A.. Larger appliances are run from 220v to keep the current and gauge of wire reasonable.
Need to fit a 25amp isolator switch for my 3Kw hot tub question is do you fit the isolator switch after the RCD Consumer Unit or to the supply cable before going to the Consumer Unit ?
No offence intended, but the second half of your question does not really enhance the first assertion.
The answer is: "The only one place it could go". You already have (at least) one isolator before the CU (i.e. its main RCD). Probably another at the head end of the submain that feeds the CU.
If all you want to do is isolate the hot tub then the isolator must be between the MCB/fuse that supplies the circuit, and the appliance in question (and you can't use the MCB for isolation since that is only a single pole device).
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