The MGP26800E10 is a 2-pole PowerPact M circuit breaker from Schneider Electric, rated 300–800 A continuous with an electronic ET 1.0 trip unit. That 300–800 A range covers large feeders and heavy branch circuits in distribution panels — the trip unit is field-adjustable, so one frame size handles multiple load currents without swapping hardware. The 65 kA AIR at 240 V AC (UL 489) means it can interrupt a fault up to that level without upstream cascading; at 480 V AC the interrupting rating drops to 35 kA, and at 600 V AC to 18 kA — important when you're tying this into a 480 V switchboard and need to verify the available fault current is within the breaker's rating. The magnetic tripping window is 1600–8000 A, which is the instantaneous pickup range for short-circuit protection. For a 400 A setting, that's 4–20× In — typical for a distribution breaker feeding motor loads or transformer feeders where you want to ride through inrush without nuisance trips. If you need Modbus metering or energy monitoring, you'd step up to the ET 2.0 or ET 4.0 trip units in the same PowerPact M frame.
Deployment context
This breaker mounts with unit-mount lugs (AL800M23K terminal kit included) and accepts 3 × AWG 3/0 to 3 × 500 kcmil copper or aluminum — substantial cable sizes for a 300–800 A feed. The lug torque spec is 50 N·m (442.5 lbf·in) for the 95–240 mm² range. It's rated IP40, so it's for indoor panel installation, not washdown environments. The HACR rating means it's listed for heating, air-conditioning, and refrigeration equipment — a common requirement in commercial HVAC panels. The operating altitude limit is 2000 m without derating; up to 4000 m with derating applied.
The MGP26800E10 carries UL 489, CSA, NEMA, NOM-003-SCFI-2000, and IEC 60947-2 approvals — covering the US, Canada, Mexico, and international IEC markets. CE marking is also listed. This breadth of approvals simplifies panel certification for machines or switchgear shipped across multiple regions.