ABB XT4 Pro-Stak 6-Pole Sub-Fe...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$5,446.46
ABB XT4 Pro-Stak 6-Pole Sub-Feed Circuit Breaker Accessory Kit

ABB XT4 Pro-Stak 6-Pole Sub-Feed Circuit Breaker Accessory Kit

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Model: MBB36

In Stock (leaves warehouse same day if ordered before 3pm ET)

$5,446.46
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ABB XT4 Pro-Stak 6-Pole Sub-Feed Circuit Breaker Accessory Kit

The ABB XT4 Pro-Stak 6-Pole Sub-Feed Circuit Breaker Accessory Kit is engineered for use with the ABB XT4 molded case circuit breaker platform, providing 2 sub-feed connections for stacked panelboard and distribution assemblies. Built for electrical contractors and panel builders working with ABB's Pro-Stak busbar system, this 6-pole accessory kit supports efficient multi-breaker feed-through wiring in commercial and industrial gear. Each unit ships individually packaged (1 ea) for straightforward stocking and installation planning.

Key Features

  • Pro-Stak XT4 Platform: Purpose-built accessory kit for ABB XT4 molded case circuit breakers within the Pro-Stak stacked busbar system.
  • 6-Pole Configuration: Supports 6-pole breaker arrangements for multi-circuit distribution setups.
  • 2 Sub-Feed Connections: Provides dual sub-feed points for downstream feed-through wiring in stacked panel assemblies.
  • Individually Packaged: Supplied 1 ea per package for simplified inventory and installation handling.
  • ABB Build Quality: Manufactured to ABB's standard electrical component quality practices for professional panel-building applications.

Technical Specifications

  • Product Type: Circuit Breaker Accessory
  • Country of Origin: Unknown

Typical Applications

  • Commercial and Industrial Panelboard Assemblies
  • ABB XT4 Molded Case Circuit Breaker Systems
  • Multi-Breaker Sub-Feed and Distribution Wiring
  • Stacked Busbar Panel Configurations
  • Renovation and New Construction Electrical Projects

Why ABB?

ABB is a globally recognized manufacturer of electrical distribution and circuit protection components, and the Pro-Stak accessory line is built to integrate seamlessly with the XT4 molded case circuit breaker platform. Choosing ABB accessories for sub-feed and stacked panel configurations helps electrical professionals maintain consistent fit, function, and long-term reliability across their distribution equipment. For complete ratings and installation guidance, consult the manufacturer's spec sheet and documentation.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Circuit Breaker Accessory
Series:
XT4
Configuration:
6-Pole
Country of Origin:
Unknown
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Circuit Breakers

ABB MBB36 – Frequently Asked Questions

1) What does the ABB MBB36 Pro-Stak kit actually do in a panelboard?
The MBB36 is a sub-feed accessory kit for ABB XT4 molded case breakers on the Pro-Stak stacked busbar system. It provides 2 sub-feed connection points so a downstream feeder can be tapped off the stacked breaker assembly instead of running a separate tap. It is hardware for the feed-through connection, not a breaker itself, so the XT4 breaker is ordered separately.
2) Will the ABB MBB36 work with a 3-pole XT4 breaker setup?
The MBB36 is built as a 6-pole configuration kit, intended for 6-pole breaker arrangements in multi-circuit distribution. If your stacked assembly is arranged as 3-pole, this is not the matching kit for it. Match the pole configuration of the kit to the Pro-Stak arrangement you are building before ordering.
3) Can I use this ABB sub-feed kit on a Square D or Homeline panel?
No. The MBB36 is purpose-built for ABB XT4 molded case breakers inside ABB's Pro-Stak busbar system, and the connection geometry is specific to that platform. For Square D gear, ZenSupply carries brand-matched accessories such as the Square D PowerPacT J Mechanical Lug Kit (aluminum, 200A-250A) for lug terminations, or the Homeline Circuit Breaker Retaining Kit for retaining breakers in Homeline load centers. Those are not interchangeable with the ABB part in either direction.
4) Is a Square D PowerPacT J mechanical lug kit an alternative to the ABB MBB36 sub-feed kit?
No. The ABB MBB36 is a Pro-Stak 6-pole sub-feed accessory kit that provides 2 sub-feed connections for stacked panelboard and distribution assemblies on the ABB XT4 molded case breaker platform. The Square D AL250JD is an aluminum mechanical lug kit for the PowerPacT J frame, rated 200A to 250A, which terminates conductors directly at the breaker rather than creating feed-through points in a stacked busbar arrangement. The two are built for different breaker frames and are not interchangeable.
5) I need to operate a breaker through an enclosure door instead of feeding downstream circuits - what should I order?
The ABB MBB36 will not do that job. It is a sub-feed accessory kit that adds 2 sub-feed connections to a 6-pole XT4 breaker arrangement for feed-through wiring. For door-mounted operation, the Square D 9421L is a PowerPacT rotary handle mechanism rated for NEMA 1, 3R, and 12 enclosures, which lets the breaker be operated from outside the enclosure.
6) How many sub-feed taps do I get per MBB36 kit, and how do I order for multiple stacks?
Each MBB36 kit gives you 2 sub-feed connections and ships individually packaged, 1 each per package. If your panel build needs sub-feed points on more than one stacked group, order one kit per 6-pole group rather than expecting a single kit to serve the whole board.
7) Is the ABB MBB36 the right part for a sub-feed, or do I need a lug kit instead?
Two different jobs. The MBB36 handles feed-through wiring off a stacked XT4 Pro-Stak assembly, letting one breaker position feed downstream gear. A mechanical lug kit, like the Square D PowerPacT J aluminum lug kit rated 200A-250A, is simply the terminal hardware for landing conductors on a breaker. If you are terminating cable on the breaker, you want lugs; if you are carrying power onward from a stacked assembly, the Pro-Stak sub-feed kit is what does it.
8) Is the ABB MBB36 suitable for a retrofit, or only new panel construction?
Both. ABB lists the Pro-Stak 6-pole sub-feed kit for renovation work as well as new construction electrical projects, alongside commercial and industrial panelboard assemblies. The deciding factor is not the age of the job, it is whether the existing gear is an ABB XT4 Pro-Stak stacked busbar assembly with a 6-pole arrangement.
9) Will the ABB MBB36 let me padlock a breaker in the off position?
No. The MBB36 is a Pro-Stak sub-feed accessory for ABB XT4 molded case breakers and carries no lockout provision. For padlocking a handle, the Square D HLO1 is a handle lock-off padlock attachment for QO series breakers. Note that the HLO1 is a QO accessory and does not fit the ABB XT4 platform, so a lockout device matched to the XT4 frame would be needed for ABB gear.
10) How does the ABB MBB36 differ from a breaker retaining kit like the Square D HOM1RK?
They solve different problems. The Square D HOM1RK is a retaining kit for Homeline breakers, used to mechanically secure a breaker in its panel position. The ABB MBB36 is an electrical accessory for the XT4 Pro-Stak system that establishes 2 sub-feed connections across a 6-pole breaker arrangement so downstream circuits can be fed through a stacked busbar assembly. The MBB36 is about distribution wiring; the retaining kit is about holding a breaker in place.
11) What part number do I quote my distributor for this ABB Pro-Stak sub-feed kit?
The manufacturer part number is MBB36, from ABB's XT4 Pro-Stak accessory line. That is the number to put on a purchase order or submittal; there is a single model on this item, so there are no finish or size suffixes to add.
How fast can I get the ABB MBB36 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the ABB MBB36 come with a warranty?
Absolutely. The ABB MBB36 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the ABB MBB36?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the ABB MBB36 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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