Hi All,

We just installed a 3-pull, knife switch with handle style disco for a PV array. Its rated AC/DC and to 600 volt. The PV array is something like 450 VDC.

My question is......how do these not arc when actuated under load? Fuses holders, MC4 connecters when disconnected under load will arc at that voltage, so why won't these do the same? Or maybe they do arc but it is considered safe?

Just want to make sure this is an appropriate use for this, and that it is in fact safe.