Review on Progressive - PD5110010QV 5100 Series Interruptor de Transferencia Automática - 120 Vac, 30 Amp with Screw Connection: Reliable Power Backup Solution by Julian Davidson

I lost my original switch because one of the wire nuts connecting it to shore power came loose, melted and then arced through the wire to the metal case. There is no such thing with this switch. The body is plastic (so no arcing is required) and the connections are screw terminals, so even if something comes loose the wires stay in place and don't move. It was a bit difficult to find a place to retrofit the mount, but once installed and connected everything worked great.