Heschen Universal Rotary Cam Selector Changeover Switch, SZW26-20/D202.2D, 660V 20A, ON-Off-ON, 3 Position 2 Phase 8 Terminals, with Master Switch Exterior Box,TUV(Standard Box)

My only grip, as others have observed too, is that the mounting box is a little too small IMO. Cables can only just be fitted in place within the mounting case.The kit includes all that you need but it's strange that only 2 cable outlets are provided when you really need 3 surely? (Power in, power out 1, and power out 2). The lack of an earthing option also means that you need to provide your own connection block for the (3) earth cables and then squeeze this in too. However, it all worked and I was just about able to then secure the rotary switch to the casing (just) - albeit I used 1.5mm heat proof cable.My use was to be able to select 1 of 2 power options for my immersion heating element in the Hot Water tank: Solar control, or (overnight cheap rate) grid power.

This switch is designed for housing electrics & it comes with all the bits you will need & a few extras.I am only using it to switch between speakers & it does that very well, overkill some might say but I like it.I'm running it one in two out, two in two out is the default but you can wire it how you wish.It is very sturdy & has a great feel to it.The one I got DID come with a wiring diagram unlike some other reviewers have stated.

I purchased this DC rocker switch to wire into my low voltage small solar array - i wanted to wire the solar input to two output, this switch offered that ability.The switch itself is good quality and i had no concerns with using this in my installation. It comes with everything you need to wire the switch including back box, screws and crimp plugs. You get a very small instruction leaflet with the switch which didn't make much sense to me. I ended up using an OHMS tester to work out the switch pins. It did take me several hours to work out the switch wiring but eventually i conquered it! The back plate leaves little room for the wiring especially when you are using thicker wires like i was 12AWG - i requires some very neat packaging to get the front plate screwed back into place.If you are looking for 1 live vs 2 loads then the wiring would be as follows;Live In - Red 1 Black 2Bridge - 2-4 Red/6-8 BlackRemainder LoadThis configuration worked just fine for me and i was able to switch my solar input between two charge controllers without issue.I hope you found my review helpful.

I used this to control 1xSupply & 2xLoad as the immersion heater circuit controlled the immersion and a show pump through a socket. So as not to breach the supply current I used this DP switch to totally isolate one from the other. My connections were; 1) Supply Live. 1&3) bridged Live 2) Load position1 Live, 4) Load position 2 Live, 5) Supply N, 5&7) bridges Neutral, 6) Load position1 Neutral & 8)Load position2 Neutral. There is a tiny square piece of paper supplied labelled tip which shows these connections. Even though position 0 is off, I have a spare water heater DP isolation with a neon which I installed between the supply and this switch. I also ordered the larger back box version and agree that this should be the standard size especially when using 2.5mm T&E and wage or other connectors.

Used this to changeover 2 inverter inputs to 1 AC output. There is extremely little space available in this unit to make all the connections. A jumper wire has to be installed to make it work as a changeover switch. The size of larger wires makes it very awkward to make all connections inside the supplied housing. I had to mount this unit onto another box and extend the connections to there. Also, the connections to the switch itself require small fork crimps: this limits the wire size and this may impact the highest safe working current. Other than these issues it seems to work fine.

Although not yet installed it appears to be of a very high quality. Reasonably priced. I would recommend.

Being in regular use for 6 months works great can't fault it nice and compact but enough room to get the wiring in nicely Highly recommended

A very reasonably priced double pole selector switch