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Identify PCB?

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wd5jfr:
Found at a hamfest.  Looks like some kind of heavy duty power filter. Any ideas.

wraper:
3 phase mains filter. Nothing special about it.
Similar to this except it does not have bleeding resistors:

wd5jfr:
That was quick thanks.

wd5jfr:
Good inspection but it  has 3 you couldn't see because of the camera angle.The 1.5uf caps are rated at 275Vac.  So it must have been on a 240Vac system.  The toroids are wound with No. 8 wire but the PCB traces would not have anywhere near the current carrying capacity.  The lower resistance of No. 8 wire would result in a higher Q but I wonder if that's important in 60 Hz power filter.  I'm  curious if this was done because they just stocked heavy toroids.

wraper:

--- Quote from: wd5jfr on August 22, 2020, 06:38:48 pm ---Good inspection but it  has 3 you couldn't see because of the camera angle.The 1.5uf caps are rated at 275Vac.  So it must have been on a 240Vac system.

--- End quote ---
If you look at the schematic I provided, those caps make star connection. So 275V X2 caps work perfectly for 400V 3 phase or anything with lower voltage. And yeah, there are bleeding resistors after all, they were simply hidden on the first photo.

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