Difference between L1100E and L1100A PSU?

Hi,

How are you guys doing today? hope all is well... : )

When I turned my T620 on today, I heard a pop and something smelled burned. A quick look at the front info display and the back of the computer, confirmed what I suspected:

One of the PSU's is kaputt!

Luckily I have two! Anyhow. I did a quick search on eBay and found the one I currently have, which is the L1100E-S0. However, I also came across one that looks pretty much the same but it is called L1100A-S0.

The E is around $90 bucks and the A is around $30. 

That said. I hate being cheap, and luckily I don't have to be, but why spend 3 times as much???

Any ideas what the difference is between the two?

Also, could I get a PSU with more watts and use it in my T620 that has a 1100 watt PSU?

Thanks,

G

P.s. Do these power supplies have a Fuse? If so, are those replaceable? Whit out having the skill level of an electrical engineer, ha ha.