selfbus.org

Hello
Lightning has damaged my system KNX power supply .
Fortunately, the damage is limited to the final varistor that has no code and is the SMD type .
I thought I would replace it with the 82541250 pattern of Würth Elektronik .
The model is correct ?

thank you

was it rearly a varistor, not a TVS Diode 36V ?

oldcoolman hat geschrieben:was it rearly a varistor, not a TVS Diode 36V ?

yes, is a varistor (pcb label = VR2)

If the supply works without them, try the varistor, or not?

the varistor is in c.c. ,no recoverable information
Obviously the feeder work fine without varistor , but is without protection !

I think you can also take a 36...40V TVS diode like in every modul

But if VR was on mains side please don't use the TVS [emoji6] A Varistor 275V should be OK for a 230V/50Hz power source.