400A House Panel: Eaton’s Xcel-Approved for "Juice-Hog" Homes
Let’s face it: standard 200A services are sweating. Between homeowners demanding dual Level 2 EV chargers, hot tubs, and heavy-duty heat pumps, residential electrical loads are hitting commercial levels. Whether you are upgrading a local service to handle a massive modern load or building out a project specifically designed to meet Colorado‘s strict 2030 electrification and building code mandates, you need a service entrance that can keep up. When a service upgrade is the only way forward, you don't want a messy cluster of separate enclosures cluttering up an exterior wall.
When a service upgrade is the only way forward, you don't want a messy cluster of separate enclosures cluttering up an exterior wall. That’s where the Eaton MBRXC08B400 comes in. It packs a commercial-grade meter socket and an 8-space distribution section into one streamlined, compact footprint. It’s built to handle serious power without dominating the side of a house.
Here’s why this is the only 320A compact house panel your truck should be carrying:
The "X" Secret Weapon
If you work in Xcel Energy territory, you already know the inspection headache of mismatched gear. The "X" in this Eaton part number means it features the exact lever-bypass design and safety provisions required by Xcel guidelines. It’s essentially a cheat code for sailing through your local utility inspection.
Serious Fault Protection (25 kAIC) - Because “Good Enough” Isn’t a Spec
Most residential stuff tops out at 10k or 22k AIC. This panel delivers 25 kAIC of serious fault protection. If that property sits close to a high-capacity utility transformer, you’re not just covered – you’re bulletproof. This is the kind of headroom that keeps you from having to defend your design choices after a fault event.
Trimming the Fat on the Wall: 36.1"W x 30.1"H x 7"D – 95 lbs
Historically, a 400A house panel meant a back-breaking, massive steel box that required two guys just to hold it straight against the siding. Eaton shrunk the overall enclosure down into a compact layout. This unit shrinks the footprint without shrinking the handroom. You get a NEMA 3R rated enclosure that’s only 7 inches deep and weighs in at 95 pounds – manageable for a two-man crew and tight against the siding. You get plenty of hand room for landing heavy wire, but the footprint stays tight and clean.
Lugs That Don't Fight You
Mechanical lugs are included and ready for (1) 1/0-750MCM or (2) 1/0-300MCM. That’s the flexibility you need when you’re terminating different services without hunting for lug kits at the counter.
Zero-Fuss Solar & EV Integration
Out of the box, the distribution section features dual factory-installed CSR2200N main breakers and full Plug-on-Neutral (PON) capability. Plus, Eaton left dedicated line-side tapping space.
In short:
(2) Factory-installed CSR2200N main breakers
Full Plug-on-Neutral (PON) ready for BR breakers
8 spaces / 16 circuits
Dedicated line-side tapping space for future solar interconnect
That last point is money. When the homeowner calls you back in 18 months to add a 20kW array, you’re not re-architecting the service entrance – you’re landing wires and moving on.
On Our Shelves, Ready to Load
Crew waiting? Truck loaded? The last thing you need is a distributor saying “two weeks.” We don't play that game.
Cost Plus Electric Supply has these in stock, on the floor, right now. Skip the wait. Email the order desk or hit the counter – we’ll have one staged and waiting for your truck before your coffee gets cold.