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ABB ReliaGear Pro-Stock Main Breaker/Main Lugs Panelboard, Copper Bus
The ABB ReliaGear Pro-Stock panelboard is engineered with a symmetrical, reversible interior that supports top or bottom feed with either main breaker or main lug construction, so installers never have to specify feed direction in advance. Configurations are built for 480V, 3-Phase electrical service on a copper (CU) bus, with main breaker ratings of 250A and 400A, main lug ratings of 225A, 400A, and 600A, and circuit (feeder) capacity of up to 42 positions depending on configuration. ReliaGear Pro-Stock modular kits are held in inventory across more than 1,500 panel designs, giving contractors, electrical distributors, and specifiers fast, predictable availability for commercial and industrial construction and retrofit projects without long custom lead times.
Key Features
- Main Breaker or Main Lugs: Configurable as main breaker or main lug construction to match service entrance and feeder requirements.
- Broad Main Bus Range: Main breaker ratings of 250A and 400A, and main lug ratings of 225A, 400A, and 600A available across the Pro-Stock platform.
- Circuit Capacity: Up to 42 circuit (feeder) positions for flexible branch circuit distribution across large commercial panels.
- Copper Bus Construction: CU (copper) bus for dependable current-carrying capacity, low resistance, and long-term reliability under continuous load.
- Reversible Interior: Symmetrical design supports top or bottom feed without needing to specify orientation at order time, simplifying stocking and installation.
- 480V, 3-Phase Service: Built for 480V, 3-Phase electrical distribution in commercial and industrial facilities.
- Modular Availability: Stocked in over 1,500 panel designs for immediate availability to distributors and contractors, reducing project lead times.
Technical Specifications
- Refer to manufacturer documentation for complete technical specifications.
Typical Applications
- Commercial and Industrial Electrical Distribution
- Panelboard and Load Center Wiring
- Main Breaker or Main Lug Service Entrance Equipment
- New Construction and Renovation Projects
- Distributor Stocking Programs Requiring Fast Availability
- Facilities Requiring 480V, 3-Phase Power Distribution
Why ABB?
ABB's ReliaGear Pro-Stock panelboards pair a reversible, symmetrical interior with copper bus construction and a wide range of main breaker and main lug bus ratings, giving electrical contractors and distributors dependable, code-ready distribution equipment backed by extensive modular in-stock availability across 1,500-plus panel designs. The reversible design and broad rating range help reduce misordering and stocking complexity for high-volume commercial and industrial projects.
Manufacturer Resources
Product Specs
- Product Type:
- Panelboard
- Product Material:
- Copper
- Voltage Rating:
- 480V
- Configuration:
- Main Breaker/Main Lugs
- Department:
- Electrical
- Product Group:
- Wiring Devices
- Product Subgroup:
- Panelboards & Load Centers
ABB AEU3422RCXAXT1B4 – Frequently Asked Questions
1) Will the ABB ReliaGear Pro-Stock panelboard work on a 480V 3-phase service?
Yes, the ReliaGear Pro-Stock panelboard is built for 480V, 3-phase distribution, which is the service it is rated for. If your building runs 208Y/120V, this is not the panel for that opening in the one-line; you need a 208V-rated panelboard instead.
2) Do I have to decide top feed or bottom feed when I order this ABB panelboard?
No. The Pro-Stock interior is symmetrical and reversible, so the same interior takes a top or bottom feed. You make that call in the field when you set the can, not on the order form. That is the main reason distributors stock this line instead of ordering feed-specific panels.
3) Can the ABB ReliaGear Pro-Stock be used as main lugs only, or is it always a main breaker panel?
Both. The configuration is main breaker or main lugs. Main breaker bus ratings run 250A and 400A; main lug ratings run 225A, 400A, and 600A. Use main lugs when the panel is fed from an upstream overcurrent device, and main breaker where you need the disconnect and overcurrent protection at the panel itself.
4) How many branch circuits can I get in an ABB ReliaGear Pro-Stock panel?
Up to 42 circuit positions, depending on how the panel is configured. The AEU3422 and AEU3424 interiors are the 42-circuit 480V 3-phase builds. If your panel schedule calls for more than 42 poles, you are looking at a second panel or a different frame.
5) What is the difference between the ABB AEU3422, AEU3424, and AEU3426 panelboards?
They split by main rating. AEU3422 (part AEU3422RCXAXT1B4) is the 225A build and AEU3424 (AEU3424RCXAXT1B4) is the 400A build, both 42-circuit 480V 3-phase interiors. AEU3426 (AEU3426RCXAXT1B4) is the standard main breaker/main lugs build in the same family. Match the catalog number to the main rating on your panel schedule.
6) Is the bus in the ABB Pro-Stock panelboard copper or aluminum?
Copper. The Pro-Stock interiors covered here are CU bus, which matters when the spec on the drawings calls out copper bus explicitly (common on institutional and healthcare jobs where aluminum bus is not accepted).
7) I need a 600A main lug panel at 480V. Does ABB ReliaGear Pro-Stock cover that?
600A is available on the Pro-Stock platform as a main lug rating. Main lugs go 225A, 400A, and 600A; main breaker construction tops out at 400A in this range. So at 600A you are ordering main lugs only and taking your overcurrent protection upstream.
8) Why would a distributor stock ReliaGear Pro-Stock instead of ordering panelboards custom?
Pro-Stock is a modular kit program held in inventory across more than 1,500 panel designs. The point is to avoid custom panel lead times on commercial and industrial work, and the reversible interior cuts the number of SKUs you have to carry because one interior covers top or bottom feed.
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Does the ABB AEU3422RCXAXT1B4 come with a warranty?
Absolutely. The ABB AEU3422RCXAXT1B4 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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