Author Options:

Correct Wiring of a Rotary Switch Answered

Hi all,

I was wondering if anyone could advise on the correct way to wire up a pair of 4 way rotary switches.

Similar to these https://www.amazon.co.uk/SZW26-20-D505-5-Universal-Change-Combination/dp/B00A8ZEXDC

There is no common live it just makes an connection between terminals 1&2 in pos 1, then 3&4 in pos 2 etc

Its to switch between 4 fixed speeds on a pair of 1ph centrifugal fans in my workshop, they will be placed in an enclosure and require 4 live connections each, do I just run a the main live into terminal 1 and bridge that into the other 3 or should the wire be split prior to connection, as in 4 individual wires?

On UK mains 230v, low amps, 4 max

4 Replies

Downunder35mBest Answer (author)2017-03-14

Does not really matter how you split the live wire.
Start at 1, jump to 3 and so on.
This way you made the "common ground" for all contacts - just pay attention that you won't use some NO contacts.
Also measure if the switch really opens the first contact before closing the second.

Select as Best AnswerUndo Best Answer

steveastrouk (author)2017-03-14

Each fan I presume has 4 taps on it ? Can you post the required connections ?

Select as Best AnswerUndo Best Answer

Squibo (author)steveastrouk2017-03-14

Sorry yes the fan has 4 seperate live connections, the wIring diagram can be found herhere, it's a million times better than any arrest I could make :)


Select as Best AnswerUndo Best Answer

steveastrouk (author)Squibo2017-03-14

It depends on your switch greatly I'm afraid.

Select as Best AnswerUndo Best Answer