Description
480Y/277V Main Breaker Kit
ABB MB423 is a Pro-Stock main-breaker kit for a compatible 480Y/277V, three-phase panelboard application.
Small details.
Big decisions.
Look beyond the product name. These four checks help narrow the right configuration.
MISSION.A little precision. A smarter selection.
Catalog-Specific Kit
MB423 is a Pro-Stock main-device kit for a 480Y/277V, three-phase application. Match the exact panelboard and breaker configuration.
Interior Compatibility
The kit must match the approved panelboard interior. Use the interior identification to confirm the correct main-device arrangement.
Mounting Arrangement
Check the breaker frame and mounting provisions before ordering. A similar kit appearance does not establish the correct bus connection.
Assembly Components
Review the kit contents alongside the required breaker and enclosure. Confirm which components are supplied and which are needed separately.
Before you select
Match the equipment. Check the fit.Panelboard Match
Match the kit catalog number to the exact panelboard interior. Main-breaker accessories are specific to the approved equipment configuration.
Breaker Configuration
Confirm the required breaker frame, poles and system ratings. Verify the components included with the selected kit before ordering.
Mounting & Terminals
Check bus connections, enclosure space and conductor requirements. Use the installation instructions for the complete approved combination.
Ask Willy: Need Help Selecting This ABB Main Breaker Kit?
Send us the ABB catalog number, equipment model and required main breaker kit configuration so our team can help review your selection.
Important Product Questions
Will this kit fit any panelboard with the same amp rating?
No. The interior, breaker frame, mounting arrangement and electrical configuration must all match the manufacturer-approved combination.
Does the word “kit” confirm that a breaker is included?
Do not assume the contents from the name alone. Confirm the component list for the exact catalog number and identify any separately required breaker or accessories.
What information is needed to match a main-breaker kit?
Provide the panelboard interior number, required breaker catalog number, system voltage and phase. Also confirm the enclosure and main-device arrangement.
Important Model Distinction
Main-breaker kits are equipment-specific. Match the exact interior, breaker frame, pole count and electrical system, and verify the selected kit contents before ordering.
