I just got a new phase converter (10 hp Phase Perfect) and am starting to approach wiring the unit. It does not come with an on/off switch (for all that $$$….) and I want to install a physical disconnect / safety switch just before the single phase input / line side so I don’t have to use the circuit breaker as an on/off switch and need a bit of help.
I found a great price on a reconditioned / surplus Square D 2 pole 100 amp fusible safety switch - model D223N
I went with this model / size because PP actually recommends a 70 amp breaker for this converter - input is spec’d by PP as 62A @ 240v, fwiw. I currently have 4 ga wire on a 60 amp 240v (single phase) circuit as the existing line circuit for my old RPC. Despite not having the 70 amp breaker currently, I wanted to future proof the size of the safety switch to not have to upgrade later on (going with 100 amp opposed to more common 60 amp.)
The question: the safety switch did not come with fuses installed. There are black metal clips clamped onto to each of the fuse holders. I’m not even convinced I need this switch to be fused, but the switch was available for the right price and hoping to make it work.
Trying to get the proper replacement fuses on order so I can move along with the installation. The inside of the safety switch box says class H, K or R fuses can be used.
The distance between fuse holders is ~6” and looks more like a blade type should fit (?) What size / type of fuses should I use here given the details?
I am going to call my electrician to do the install, but want to have everything on site and ready to go to prevent him from having to make multiple trips, especially if it needs to be ordered. I have done plenty of my own wiring and know basics, but this is slightly outside of my experience and comfort zone to be 100% confident with.
Thanks for any help.