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ABB Pro-Stak A2 MCCB Stacking Kit, MBA1 Series
The ABB PRO-STK A2 3-Pole MCCB Stacking Kit is an accessory component engineered for the ABB MBA1 Series of molded case circuit breakers (MCCB). Designed to support 3-pole breaker configurations, this stacking kit allows installers to mount and align MBA1 Series breakers within panelboards, switchgear, and industrial power distribution enclosures. Each kit ships individually packaged (1 ea) for straightforward inventory management and job-site handling, making it easy for electrical contractors and panel builders to stock exactly what a project requires. As a genuine ABB accessory, the PRO-STK A2 kit is built to integrate seamlessly with compatible MBA1 Series MCCB units, helping maintain proper breaker spacing and mechanical alignment during installation.
Key Features
- Compatible Series: Engineered specifically for the ABB MBA1 Series of molded case circuit breakers (MCCB).
- 3-Pole Configuration: The PRO-STK A2 kit is designed to support 3-pole MCCB installations.
- Stacking Kit Function: Facilitates proper mounting and alignment of MBA1 Series breakers within panelboard and switchgear assemblies.
- Individual Packaging: Supplied 1 ea per package for accurate inventory tracking and easy handling on the job site.
- Genuine ABB Component: Manufactured by ABB for use as a factory-matched accessory to MBA1 Series circuit breakers, helping preserve fit, function, and warranty coverage.
- Simplified Sourcing: As a dedicated PRO-STK A2 part number, this kit removes guesswork when ordering stacking hardware for MBA1 Series breaker projects.
Technical Specifications
- Country of Origin: UKN
- Packaging: 1 ea
- Buy American Act (BAA) Compliant: Contact Manufacturer
- American Recovery and Reinvestment Act (ARRA) Compliant: Contact Manufacturer
Typical Applications
- Panelboard and Switchgear Assemblies
- Industrial and Commercial Power Distribution
- MBA1 Series Circuit Breaker Installations
- Electrical Retrofit and New Construction Projects
- OEM Panel Building
- Government and Public-Sector Projects Requiring BAA/ARRA Documentation Review
Why ABB?
ABB is a recognized global manufacturer of circuit protection and power distribution equipment, and the PRO-STK A2 stacking kit is built as a factory-matched accessory for the MBA1 Series MCCB line. Choosing genuine ABB accessories helps ensure proper fit and function with MBA1 Series breakers, supporting reliable, code-compliant electrical installations for contractors, panel builders, and facility engineers alike. Because Buy American Act and ARRA compliance status for this part is listed as Contact Manufacturer, project teams with federal sourcing requirements should confirm current documentation directly with ABB prior to specifying this kit. For additional technical detail, refer to the manufacturer spec sheet documentation available for this product.
Manufacturer Resources
Spec Sheet
Product Specs
- Product Type:
- Circuit Breaker Accessory
- Series:
- MBA1 Series
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Circuit Breakers
ABB MBA12 – Frequently Asked Questions
1) What is the difference between the MBA12, MBA13 and MBA16 stacking kits?
Pole count and part number are what separate them. MBA12 and MBA13 are both 3-pole kits, and MBA16 is the 6-pole kit. Order by the exact MBA part number that matches your breaker configuration, since the three are not interchangeable.
2) Can a Square D Homeline retaining kit be used in place of an ABB MBA1 stacking kit?
No. The ABB PRO-STK A2 stacking kit is built as a factory-matched accessory for ABB MBA1 Series molded case circuit breakers, mounting and aligning them in panelboard and switchgear assemblies. The Square D HOM1RK is a retaining kit for the Square D Homeline series, a different manufacturer's breaker line. Breaker mounting accessories are series-specific, so order the ABB MBA1 kit for MBA1 breakers and the Homeline kit for Homeline panels.
3) I need to lock out a breaker handle, not stack breakers. Is the MBA1 kit the right part?
No. The ABB MBA1 Series stacking kit handles mechanical mounting and alignment of MBA1 breakers inside an enclosure; it is not a lockout device. For padlocking a breaker handle in the off position on Square D QO series breakers, the part built for that job is the Square D HLO1 handle lock-off padlock attachment. Confirm the lockout accessory matches the breaker line you actually have in the panel.
4) My breaker arrangement is 6-pole, not 3-pole. Is there an ABB option or do I need a different brand?
Stay within the ABB MBA1 Series. The PRO-STK A2 kits are offered as MBA12 and MBA13 for 3-pole configurations and MBA16 for 6-pole, so the 6-pole arrangement is covered by the MBA16 part number. There is no need to cross to another manufacturer's accessory line, and Square D accessories such as the Homeline retaining kit or QO handle lock-off are tied to their own breaker series.
5) What does a Pro-Stak stacking kit actually do in a panelboard?
It mounts and aligns MBA1 Series breakers inside the enclosure, holding proper spacing and mechanical alignment between stacked units. Think of it as the mounting hardware that lets multiple MCCBs sit correctly in a panelboard, switchgear lineup, or industrial distribution enclosure rather than anything that changes the breaker's electrical rating.
6) Can I use this ABB kit for a federal job with Buy American requirements?
Buy American Act and ARRA compliance status for the Pro-Stak A2 kit is listed by ABB as Contact Manufacturer, and country of origin is shown as UKN. Project teams with federal sourcing requirements need to get current documentation from ABB before specifying it on a BAA or ARRA job.
7) I need a handle lock-off or a retaining kit, not a stacking kit. What else is there?
Those are different accessory types. For padlocking a breaker handle in the off position on Square D QO breakers, the Square D HLO1 handle lock-off attachment is the part. To hold Homeline breakers in place, Square D offers the HOM1RK retaining kit. For a rotary operating handle on PowerPacT breakers in NEMA 1, 3R or 12 enclosures, look at the Square D 9421L mechanism. None of those mount ABB MBA1 breakers.
8) Does the ABB MBA1 stacking kit include lugs for terminating feeders?
No. The MBA1 Series stacking kit is mounting hardware for breaker placement and alignment in panelboards and switchgear, supplied 1 each per package. Conductor termination is a separate accessory: on the Square D side, for example, the AL250JD is an aluminum mechanical lug kit for PowerPacT J frame breakers covering 200A to 250A. Specify lug kits separately and match them to the breaker frame you are landing conductors on.
9) What accessory do I need if the job calls for an external rotary handle rather than a stacking kit?
The ABB PRO-STK A2 MBA1 kit only positions and aligns MBA1 Series breakers in the assembly. For through-the-door operation, the comparable part is the Square D 9421L PowerPacT rotary handle mechanism, rated for NEMA 1, 3R and 12 enclosures, which is used with Square D PowerPacT breakers. These serve different functions and are not interchangeable with each other.
10) How does the ABB Pro-Stak kit ship, one piece or a multi-pack?
Each Pro-Stak A2 kit is supplied 1 ea, individually packaged. Panel builders ordering per project can buy the exact count of kits needed without breaking a bulk carton.
11) Where can I get detailed mounting dimensions for the ABB MBA1 stacking kit?
ABB publishes a spec sheet PDF for the Pro-Stak A2 kit, linked in the product details, and that is the place to confirm mounting geometry and breaker frame fit before you cut your panel.
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Does the ABB MBA12 come with a warranty?
Absolutely. The ABB MBA12 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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