The feature might be called robustness with reverse polarity protection. You are more likely to find it in older design linear PSUs with much less "bang for buck". The BK Precision 1652 I have is one example of a supply that is protected against this sort of thing--but it is only a 24V 0.5A per channel (1A total) output. I have some others that I suspect might be OK, but I'm not willing to experiment.
Whoah!
Somehow I missed this gem in my first skim through the thread. Yeah, wow, a lot of cheaper linear units do indeed have a reverse polarity spec! It seems entirely absent in all the "nicer" newer units I've looked at, including from all the high-end brands. How utterly bizarre.
Curious what you are thinking of replacing it with so I'll stay tuned, sorry but I lack advice in that area.
It turns out that I've never actually used the remote-control features of the fancypants digital unit anyway. If I have to give those up to get the common-sense and obviously-important-in-my-use reverse-polarity protection, I think I'll be doing just that.
It looks like I can add whole shelf of Triplett PS303/PS305 or similar, for considerably less than another Siglent. They look like a downgrade in every way, except the whole not-exploding thing.
I am really gonna miss the ability to see/adjust the current limit setting with the load connected. It looks like that feature is mutually exclusive with reverse polarity protection. Every single unit I've found specifies the "unhook the load, short the terminals, twiddle the current knob, remove the short, hook the load back up" dance. Oy. I could probably make an interposer board with a big ol' SPDT switch, just gotta be ultra sure it's break-before-make...
A fuse might help in some cases depending how the failure occurs--if it is just thermal damage due to high currents, a fuse is your savior. In other cases it won't help. I personally would use a 7.5A ATO fuse right at the battery in your application no matter what PSU you have. You can always have other issues, like accidentally shorted leads, that would be a pretty serious issue with a battery that size.
This is a really good point, and upon further consideration, there's no reason that
any test lead should
ever be unfused, except I figure that would make them mechanically snag on things. Figure someone could make a banana plug with an integrated fuseholder that would probably solve that, but has anyone ever done so? Doesn't look that way.
Your burnt PSU may be repairable--crack it open and lets all have a look. You may find that some parts near the front end have sacrificed themselves and the bulk of it may be OK. And you can modify and hack it now that the warranty has....expired?
It's outside now airing out; once the stink is down to a manageable level I'll be doing just that.
Tough lessons they are too but I have a mainboard of an X-E that I can take pics of and maybe partly RE the output stage to help with a repair.
The front panel of the SPD3303X(-E) always did bug me, the jacks not being 19.05mm on-center like all my paired Pomonas, and I'd been considering a replacement jack-field anyway just to fix that. Also I'd like to add switches that tie all the negatives to a common bus, which is a frequent operation on my bench (and I wish there was a button and internal relays for that just like ser/para operation). And I might as well add some fuses, ideal diodes, perhaps it can be modded for remote sense.... why am I not just buying a whole new one? Oh right, because none of the new ones have those things either.
Unless it is 4 quadrant PSU or a device specifically made to charge batteries it won't survive pushing twice the rated voltage into it's outputs and reversed power source connection... Not to mention battery can give serious current without any limit...
Just for clarity's sake, it wasn't twice the rated voltage. It was 3.65 volts, from a single 55AH cell. The PSU is rated to 32 volts, just only the other way around...