our electricity supply is on our boundary and the plant room about 25m away, as such I believe I need a switched fuse isolator installed in the cabinet (confirmed by my electrician). 

 

I've been looking at my options here and the price difference varies dramatically! e.g.

 

https://www.gil-lec.co.uk/hager-jfe310u-fuse-switch-tpn-enclosed-100a - This Hager one is £450+VAT

https://www.cef.co.uk/catalogue/products/4920299-100a-tp-n-metal-fused-switch - This Lewden one is £278+VAT

https://www.electricaldirect.co.uk/product/contactum-100a-met-tpn-fused-switch-disconnector-648206 - This Contactum one is £205+VAT

https://www.electricaldirect.co.uk/product/ced-100a-3-phase-tpn-fused-switch-disconnector-671368 - This CED one is £156+VAT

 

I haven't included the ludicrously priced Eaton units!

 

Can anyone please tell me if these are all the same in terms of quality and safety? We have a TT earthing system if that matters as my electrician says that due to the resistance of the TT system we would be hard pressed to ever blow a 100A fuse and we have 2 options with the TT system, 1. RCBOs throughout (my chosen method) 2. a time-delay 100mA RCB. So, if we're never likely to trip the 100A fuse why would I want to pay large amounts of money for a Hager isolator if the CED one does just as good a job?

Switch fuses are all very similar, some are easier to make connections, some have thicker enclosures. The Hagar boxes do seem to last better exposed to the elements. If you are putting it into a box/shed/kiosk then I would be going for the Lewden box. Had a couple of the Electrical Direct Dist Boards and found them flimsy with rubber screws

6 minutes ago, markc said:

Switch fuses are all very similar, some are easier to make connections, some have thicker enclosures. The Hagar boxes do seem to last better exposed to the elements. If you are putting it into a box/shed/kiosk then I would be going for the Lewden box. Had a couple of the Electrical Direct Dist Boards and found them flimsy with rubber screws

cheers and, yes, it's going in a GRP cabinet. sounds like a fair compromise between cost and quality. I was thinking that either the Lewden or the Contactum would be the ones to go for as a middle of the range type unit.