Sega Genesis unknown power component

I'm embarrassed to say I did this, but I plugged a power cord with reversed polarity into my Sega CD (model 2). The Genesis (VA 2.3) was also attached at the time of the incident. The Sega CD is fused, and luckily, all I blew on the Sega CD was the fuse. I replaced the fuse and tested it with another Genesis, and all is well.

After the incident, the Genesis appeared "fried" as well. The Genesis is not fused in the way that the Sega CD is, so I had to start hunting around for what I blew up. I swapped out the regulator without success. Then I swapped out a component labeled "CF1" from another working Genesis board, and all seemed well again. What is "CF1"? How would I go about buying one on Mouser or the like? Here's a photo of it:

 

Not sure as the marking is odd. It could be a bridge rectifier. It shouldn't blow on reversed polarity since it'd correct anyway but if one of the 4 internal diode is bad, it may prevent power supply from getting through.

 

The second Sega Genesis I fixed, I messed up that part because I shorted the system when I mixed the ground and voltage when I reflowed the solder for the power port. Console5 told me to remove that part and connect the points directly.

 

If that worked, that means this part is not a diode. If shorting these points work, that suggests that this is in fact some sort of fuse. Right?

 

Kind of reminds me of an EM (Electro Magnetic) Filter.

 

And that's exactly what it is.