What is this component?

[wadmancpu]

This is marked SA803S. Anyone know what this is? It's the black one with a green and pink stripe, looks a bit like a resistor. I can't find it listed anywhere. Thanks.

[fzabkar]

Surge Arrestor

[No.Mad]

Surge Arrestor

That would be weird ass surge arrester. I never saw like that one before. I always thought they look like that:

[fzabkar]

I thought it may have been a DIAC, but the "SA" in the circuit reference didn't seem to fit. It would help to see it in the context of its surroundings.

[wadmancpu]

Here's a better pic. There is one of these on each winding of the inductor.

[maginnovision]

Looks like an input filter so it's probably a resistor, though I don't know why they'd have two.

https://interferencetechnology.com/mains-input-filters-what-is-inside-the-box-and-why/amp/

[David Hess]

Normally those parts would be resistors but I do not know what the parts shown are.

[wadmancpu]

They test with zero resistance so I have no idea.

[fzabkar]

They test with zero resistance so I have no idea.

Are they in parallel with the inductors?

[HB9EVI]

normally at the mains filter I'd expect a bleeder resistor, but if it bypasses the CMC winding it doesn't make much sense

[JFJ]

They test with zero resistance ...

They look like the surge absorbers (glass encapsulated spark gaps) that Samsung commonly use in their television/monitor power supplies. In circuit, they will appear to have zero resistance, because they're connected in parallel with the common mode choke windings:

[No.Mad]

They test with zero resistance ...

They look like the surge absorbers (glass encapsulated spark gaps) that Samsung commonly use in their television/monitor power supplies. In circuit, they will appear to have zero resistance, because they're connected in parallel with the common mode choke windings:

That's really interesting. Never saw or heard about that one before.

[David Hess]

They look like the surge absorbers (glass encapsulated spark gaps) that Samsung commonly use in their television/monitor power supplies.

That is my guess since a glass resistor would not be used.  I wonder why what is essentially a GDT surge arrest er would be used.

[maginnovision]

They look like the surge absorbers (glass encapsulated spark gaps) that Samsung commonly use in their television/monitor power supplies.

That is my guess since a glass resistor would not be used.  I wonder why what is essentially a GDT surge arrest er would be used.

Make warranty repairs cheaper?

[David Hess]

That is my guess since a glass resistor would not be used.  I wonder why what is essentially a GDT surge arrest er would be used.

Make warranty repairs cheaper?

By suppressing voltage spikes across the common mode filter?

[duak]

There is a reason for the TVS bypassing the common mode choke and it is to pass a transient immunity test.  A common mode choke usually has a medium to high mu core that saturates at a fairly low common mode current relative to its current rating.  When a common mode transient voltage is applied to the input, the current rises slowly until the core saturates, the inductance drops like a rock and the energy stored on the input side capacitance is dumped onto the load side.  This current pulse is higher in amplitude and narrower in width than the original transient.

Look up Magnetic Pulse Compressor.

The image shows a 3 stage compressor that can be used for driving things like pulsed lasers.

Ask me how I know,

[fzabkar]

http://www.sourcecomtech.com/wp-content/uploads/2015/09/DSS-Series.pdf
http://www.mmc.co.jp/adv/dev/chinese/pdf/Division_PDF/dss.pdf