Question I've had about four PSU failures in the past year, is there something I'm doing wrong ?

[Stagz]

PSU model is a MSI MAG A850GL PCIE5, I've gotten them as replacements under warranty, one after another from MSI's official service shop, fresh from the box too. My PC was connected to an extension cord with surge protection. The PSU gave a loud pop seemingly out of nowhere and died, and that was the case for the previous failures; it tripped the circuit breaker for the room but did not blow the fuses on any of the cables.

My house has never experienced power surges in the past. Could there be some issue with my PC components that's causing the PSUs to pop? The failures occur anywhere from a week of use to many months, and I want to find out what the cause might be before I get another PSU.

My PC specs are:
CPU - Ryzen 7 5700x
GPU - Radeon RX 6800XT (XFX Speedster Merc 319)
Mobo - ASUS ROG Strix B550-A
RAM - 32GB (16x2) Corsair Vengeance RGB RT 3600MHz C16
PSU - MSI MAG A85GL PCIE5 (850W)

 

[--SID--]

Were those PSUs popped on the primary side or the secondairy side? If they were popped on the secondary side, it has nothing to do with the house grid.

 

[Stagz]

I'm not quite sure how to identify between the primary/secondary side since I can't really get a good view of the damage and I don't want to open the PSU up since that voids warranty...
From what I've seen so far though there's usually a flash of light on the side where the power cable is plugged in, and previously I've seen some damage on that side too. Is that the primary side? If it has to do with the house grid, are the ways for me to better protect my PC?

 

[--SID--]

From what I've seen so far though there's usually a flash of light on the side where the power cable is plugged in, and previously I've seen some damage on that side too. Is that the primary side?

Primary side. Probably an exploded fet or bridge rectifier.

If it has to do with the house grid, are the ways for me to better protect my PC?

A UPS maybe

 

[Stagz]

Thanks! I did a quick test with a multimeter and found the resistance between the live and neutral terminals on the AC supply side of the PSU to be ~50 ohms, is this considered normal?

 

[geofelt]

Double check that your outlet has a proper ground and that the polarity is correct.
A simple $10 tester like this will do the job.
https://www.amazon.com/Receptacle-T...MI-fzo4oHvgwMVzdbCBB1r_Q9_EAQYASABEgJjT_D_BwE

A suitable UPS can overcome some power issues.