Baomain Universal Rotary Changeover Switch SZW26-40/D303.3D with Master Switch Exterior Box 660V 40A 3 Position 12 Terminals 3 Phase

Bought this to switch between powering my shed's service panel either through my solar's inverter or gas generator and after getting it all wired it works awesomely. It's a tight squeeze in the box especially with 10 and 12 gauge wires going to the switch, but made it work.I have 1 leg as a 120v input from my inverter with a jumper for the second hot leg and then the other leg is 240v input from the generator plug I have coming from the outside of my shed with the output legs going to the service panel.The contacts are very close together when not selected so like another reviewer stated I can totally see the possibility for bleed over/arcing for the leg that's not selected, so I put a breaker inline between my inverter and this switch just for insurance.Otherwise, I hope this holds up, it's done the trick! Also recommend using ferrules and not Y connectors, it'll make things easier since you have to jump between the two output terminals and may need to jump another hot leg if you're only running 120v to one input.

We try to buy from the Ma and Pa places on here.Being disabled . We need to be price conscious.At "The Mother In Laws Place"It is an off-grid cabin, we run DC on a lot of things .We see no need to use the inverter 24/7.just so you can turn on a light when you come home .We use LED bulbs in ceiling mount fixtures that are marked 12-volt DC only.These are controlled by controller with a FOB remote.The controller is board mounted on our PV control center .We use a few of the controllers for different rooms to control each ceiling light .We also run the kitchen stove exhaust fan with DC .The fresh air intake system for combustion is DC .These are fused in our DC only fuse center .This fuse center is controlled by a service disconnect at the DC master box .We also run two AC fuse boxes on our PV board .One protects various AC 110 volt circuits in the cabin , garage and sauna .We use this as a master switch on part of the systemThe other protects 220 volt circuits from the aux gen set and to the split ac/heat pump and the aux battery charger for when the PV and hopefully soon to be wind generated power are not enough to keep up.We run 8 - 6volt Rolls batteries tied by Buss bars .They are temperature and voltage monitored on the PV board and by the inverter unit.The power is inverted by a Renogy 3000 .It also has a multi stage charger built it with flow through capability .These are almost all protected by Breakers purchased here .We have a remote shallow well system that we use a soft start unit on .It lessens the instant draw on the system .It is all about power management.This is a semi detailed , general description of some of the off grid power systems we use .

It works. Could cost less.

I purchased this switch to use in my emergency power backup system for our home. I have had a gas powered standby generator for years and wanted to add a solar/battery generator, as well. One generator feeds 240V, 30amp power while the other feeds 120V, 30amp power. I needed a way to connect both generators to an existing transfer switch, but be able to select which power source was feeding the system. This switch was the perfect solution to that need. With three contacts on all sides of the switch, it accommodated the two power legs and neutral from the 240V generator feeding the same on the output side of the switch. The single power leg and neutral from the 120V generator, along with a jumper, provided the other power to the three wire output. Since there were two inputs to the switch going to a single output, three jumpers were also required. Be aware that the knockouts on the switch box are not standard size but are sized for the rubber grommets that come with the box. Consequently, a standard 1/2" or 3/4" cable connector will not work. An optional 2-part cable connector that can be slipped into the knockout holes will be needed. Also, you will have 11 or 12 10ga. solid copper wires coming into this box that will be very hard to compress into the box once your switch is wired. It can be done with special attention to placement of the wires, though, and when place in service, this is a top quality switch.

If you're switching to alternate power sources for a 220 appliance or well pump this is the switch you need.

This Baomain Universal Rotary Switch is just what I needed to control two circuits independently. The neutral OFF position is perfect too, for when I don't want either of the other two circuits live and functioning. Nice size too! Much easier for wiring. I'm sure that it's a bit of an overkill for my two 115vac circuits, but it's all I needed. And it's a solid switch.