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,(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.

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.

This is a very well-made switch with accessible and secure connection terminals. I use it for switching between two standby mains generators before the current one runs out of fuel. If switched quickly the domestic load sees only a very brief interruption, not normally long enough to reset clocks, timers, etc. The central off position ensures that there is no possible short between inputs. This arrangement gives me effectively continuous standby power, necessary in our location from time to time, at the small cost of popping out to the generator shed every 4 hours or so, to switch over, and, after a cooling down period, re-fuel and check the oil level of the standby generator. I have two reservations about the switch: Firstly, the space inside the switch box is very tight. It is difficult to squeeze 3x13 amp cables and links into the available space. Secondly, the switch is provided with only two knock-out holes and weather-proof glands, each capable of accommodating one 13-amp cable, but not two. A change-over switch normally requires one input and two output cables. I used Gaffer Epoxy Putty to create a solid weather-proof seal for two input cables. On the hole, however, this switch is highly recommended - but make sure you figure out the wiring diagram carefully.

A very good switch for the money, nice and a good 45 degree action and a robust box. Can use it for multiple applications but I use it to switch between a boat inverter and Shore power

This is a good switch 8 connections in total, working well and I am very pleased with the outcome. I didn't use the box that the switch was fitted in. Unit comes with connectors x8 plus 2 extra also 2 cable glands. Very good value for money. I have been putting this job off for ages, but it really isn't hard to do.

Seems well built. Not much space for your wires once the back is on and all tight but easy to wire up, and feels solid. You could remove the switch from the box and panel mount if you needed. Used in my case to power a diesel heater from one of two sources.

Very cool item

Seems well made, but beware this might not do what you think it will do, or least not with out some extra and fiddley wiring. If you want to simply switch between two mains sources, this is not an out of the box solution, its a cam Selector changeover switch, which means that effectively 4 switches, with two being on (closed) in position 1 or 2 or all open (off) in center position. This means you have to join up two for Live output and two for the N output. Not that difficult, but a proverbial pain in the ..... Get it wrong and things can go spectacularly wrong rather quickly! Have attached a possible solution, but check your connections, they may be different, and buzz things out before applying mains! Its your risk Better solution for a simple change over of main sources: Decided it was a neater, safer and and better solution to go for a DIN rail switch over with a separate indicator light - housed in a 5 slot Din box - also here of course on Amazon. Should add if you want flexibility in switching then this fits the bill! Would I buy again?- Yes if I needed this switch configuration, for simple mains change over No

EV充電に使用しました、200Vで充電すると契約ブレーカーがトリップする場合に100V切替て使用する。電気工事士免許がある方のみ参考

Facile à monter et bien expliqué

Works as it should

guter Schalter macht was er soll -bin zufrieden

Fungerar utmärkt. Använder för omkoppling mellan batteri och landström i husbilen.