Surge Protection Circiut Help

Thread Starter

Slex04

Joined Jun 1, 2017
3
upload_2017-6-1_14-52-54.png
We are using this surge protection circuit on 16VAC transformers. What we found is that the 500mA fuse tends to open circuit regularly. There is never a sign of surge presence as there is no other reported damages to household equipment. We tried a slow-blow fuse but although less complaints there is still fuses that blow unnecessary.

Has anyone got some advise for me. Is this circuit at fault or wrong components causing it to function at lower Voltages?

I would appreciate some advice

Regards

Alex
 

Thread Starter

Slex04

Joined Jun 1, 2017
3
How much current is being drawn - how near is it to 500mA?
Hi

The Secondary or Load does not draw more than 3A. This is not more than 220mA at primary. The actual use of the the transformer averages at about 1A load..and this is why I suspect the surge protection circuit and not the load ..
 

Thread Starter

Slex04

Joined Jun 1, 2017
3
Re-size the fuse.

44% of the trip current is way too close.

Ask yourself- "what does the fuse prevent?"
It's should prevent the wiring and components from catching on fire, this will happen at a much higher current than 500 mA.
Thank you ..I realize the fuse is not for overload protection in this instance...so it should rather be 1A at least
 
Top