it's effectively a steampunk version of power armor specific to the Iron Kingdoms setting. The reason the 3.5 version of warcaster armor is clunky and inelegant is due to magic items in that setting being more rare(theres a chance to permanently lose hp's when crafting which gets higher the more powerful the item). The setting gets around this by using a science they call mechnika, fusing mechanics and magic to use a string of smaller easier to craft magic items along with external power sources(steam engines mostly) to accomplish the effects of more powerful magic items.
Warcaster armor is one of the pinnacles of mechanika. It does everything from helping less physically adept mages wear the heavier armor that protects them on the battlefield to enhancing the power of more physical mages letting them wade into battle matching and even out performing warriors. The biggest of these protections was a power fiels(force field, shields, whatever you want to call them) that absorbed damage and recharged slowly over time or could be quickly recharged by the caster. The combination of these making the wearer very hard to stop as well as helping their spellcasting in some interesting ways like not needing to handle components(stored in a special chamber on the armor for instant use when casting begins) and letting them ignore the spell failure chance from the bulky armor.
As to a pathfinder version I haven't run into anything to simulate it. Your best bet would be to work with your GM and see if he will let you use crafting feats to invent what your looking for or see if he's willing to have it exist in some form in whatever setting your using. If that is not an option a flavorful application of multiclassing into synthesist summoner to get the hp buffer and enhancements.
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You could set up a super efficient steam engine back at home base and pipe the power to your suit via ring gates. You can get around the ring gates weight limit by having the ring gate right at the top of a reverse gravity spell.
Then it would just be a matter of using the power of a nuclear reactor equivalent in a good way.
I recommend using it to charge various technological items from the technology guide and slinging stuff like rail guns or a x ray laser.
Now you can charge this stuff. But it is expensive to get the materials for it. If you are a wizard you can make money by crafting magic items but you'll need to use at least some of the cost reducers.