BaomainUniversal Rotary Changeover Switch SZW26-20/D202.2D-W with Wider Master Switch Exterior Box 660V 20A 3 Position 2 Phase (3.15"x3.15"x3.7")

Sturdy design. Easy to use. Looks professional.

Very solid product but if you’re using Romex then be sure to buy the larger box version. Almost no room in the small box.

Wish I had taken photos of the install. It was NOT easy. This is a 20A switch, which means you'll need to use 12 AWG wire. But it works as advertised!For my project, I wanted the switch to be able to switch from power from the inverter to power from the grid. That way, my devices (fridge and small electronics) in our camp trailer would be powered no matter the source.So I needed wires coming in from the grid (two go into the box, ground wire stays outside the box)Then wires from the inverter (same deal, two into the plastic box, ground wire outside)Then four wires coming out of the box that lead the AC circuit breaker and house outlets, plus two ground wires outside the box.To wire it all up, those four ground wires got secured with a large red wire nut (max four 12 AWG) and many more wire nuts to the rest of the connections outside the box.But the connections inside the box were the hardest. Getting all those wires through the little cutout holes was tough enough, but then trying to jam the whole front faceplate and box together and screw it all together was harder. Gotta make sure that all your wire is stripped properly (no nicks in the insulation) and you have screwed down the terminals on the switch really well. Fortunately, despite the entire switch being made of plastic (except for the terminals and internal electrical connections obviously), it seems fairly durable for light use. I would not trust it in a really heavy duty situation where it could get kicked or hit, but protected and out of the way seems fine.Since this was in a mobile setting, I used stranded wire. Would probably have been easier with solid core wire. With the tight spaces in there, the risk was too great for a stray strand of wire to touch someplace it should not and cause a short, so I crimped ferrules onto the end of each wire and this made it SO MUCH easier and safer assembling it. Do yourself a favor and buy a kit with ferrules and ferrule crimper.Long story short, I ended up not using the back end of the plastic box. I just left it off and installed the faceplate part that holds the switch anyways onto some 1/2" plywood. This made it way way way easier putting the whole thing together in still a tight space inside the camp trailer under the fridge

It works to let me switch my breaker box from grid power to my solar system.

This is a very well built and nice switch. The housing is small, but to fix the problem, we added a junction box and from pig tail wires coming from the rotary switch, we connected all the wires inside the J Box.One issue we noticed that the wiring diagram the comes with it appears to be incorrect. Position 1 connects #1 & #2 lugs. And Position 2 connects #3 & 4 lugs, not as shown on the wiring diagram..

This reversing switch was exactly what I needed . Easy to install looks and functions well ⁷⁷

This a good switch. It is very compact with the housing it comes with, so for a novice wiring it, they will be challenged! I like the compact size, and it works well.

For 20 amp the wire preferable is 14 awg. There is not the space in the housing for three cables (input and two outputs). Difficult to fit two cables, what I needed, not needing a changeover function. The housing is simply too small and only has cable entries for two cables. Switch itself seems robust and well designed except for two outputs bridging of the input is necessary whereas one would expect such bridging to be built in.Rear of the housing as screw holes so free standing switch is not weatherproof.Fits my purpose of mounted weather resistant 20 amp on/off switch so 3 stars due to poor housing sizing and consequent difficulty in wiring. For the function advertised would rate it as zero.