ERSA MS 250 Solder Iron Switch

Add-on for the ERSA MS 250 soldering station to switch between the two soldering irons.


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The ERSA MS 250 Soldering station comes with 2 soldering irons, a full size 25W and a pen size 6W soldering iron. After years of switching between the two by unplugging and plugging in the other, the RCA jack in the station had a broken solder joint and the station was not working reliably anymore. After fixing the broken solder joint, I decided to create this add-on that allows me to keep both soldering irons always plugged in and just switch between the active one with a switch.

Materials and methods

Printed in PLA with 0.2 mm layer height and support everywhere.

Needed Parts:
2 Female RCA Jacks
1 Male RCA Plug
1 Miniature Toggle Switch 2xON/ON
Wire with minimum 0.5 mm² (AWG-20)



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Mini reiner 001 2Reiner Bühl published this design ago