Function of This Circuit

'Which fuse it will blow', you assume?

What fuse? It appears to me that FL16 and FL17 is a low pass filter network (assuming the capacitor leads are attached to GND of that chassis) to remove RFI from entering or leaving this chassis. Wait, there is a fuse in the lower corner that goes somewhere after being stepped down through some transformer. Without seeing the rest of that part of the circuit I will not hazard a guess what might trip this fuse.

I suspect that the desired image is larger than the CR4 server picture space will allow. I do not see enough of the schematic nor which part you need help in understanding.

I agree, looks like a noise filter circuit. Not sure what the fuse comment was all about either.

I would suggest a more focus view of the ckt intended for this analysis.

This looks like a power supply used on an aircraft.

The two caps are for noise suppression, not fault detection.

i agree and looking at the test-points near the caps, it is made to change these capacitors according the amount of noise (i think)

I agree that FL16 and FL17 form a low pass circuit (series inductor), it is not possible to know what type of filter C28 and C29 form without knowing their values. If they are high values, they form a low pass filter, and a high pass filter if they are very low values.

No. The corner frequency changes with component value, but as long as the arrangement (topology) of capacitors and inductors remains the same this will always be a low pass filter.

Suggest you stick to selling visas .

The circuit elements C28 & C29 are capacitors, not Normally Open contacts and so don't switch the power to ground.

An easy mistake to make.

this is not a protection ckt it conditions only (giving quality)

Here's another vote for noise suppression.

It is part of the low-pass filter. Which also makes clear why _earthing_ of the circuit/device is essential. If not earthed the voltage potential on the common of the circuit is about half the line voltage. For a mains line this will be signicficant. If the circuit has an external connector and you try to connect it to a system that is earthed, all sorts of electronic damage may occur.