DIY Doctor

Wiring a Fused Extractor Fan Isolator

Postby AzK » Fri Dec 25, 2020 10:37 am


I am installing an extractor fan that has a built-in humidstat and timer. I ordered a
'10A 3 Pole Fan Isolator Switch with 3A Fuse' to combine having both a fan isolator switch and a FCU.

Has anyone wired one of these up before or would they have a good idea how to do it? It's more the 'L in' and 'L out' element on the back of the fuse that I am not sure about.

The fan is a Xpelair CV4SR that has 3 connections (T-L-N).

I am planning to wire:

L1: Black (Switch live) to 'T' (within the fan unit)
L2: Brown (Permanent live) to 'L'
L3/N: Grey (Neutral) to 'N'

That being the case, where do L in and L Out wire into?
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Simply Build It

Postby Mr White » Sat Dec 26, 2020 12:05 am

Connect it as you said. BUT, instead of the permanent live going to L connect it to L in on the fuse, then connect a small wire from L out on the fuse to L on the isolator.
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