Square D FlexSet PowerPacT R S...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$14,316.11
Square D FlexSet PowerPacT R Switchboard, Three-Phase Busbar, 1200A 600VAC

Square D FlexSet PowerPacT R Switchboard, Three-Phase Busbar, 1200A 600VAC

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Model: RKF36120U43AFLEX

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

$14,316.11
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Square D FlexSet PowerPacT R Switchboard, Three-Phase Busbar, 1200A 600VAC

The Square D FlexSet Switchboard with PowerPacT R-Frame busbar-mounted circuit breaker delivers robust three-phase power distribution and protection for commercial and industrial electrical systems. This unit is equipped with a Micrologic 5.0 A LSI electronic trip unit for long-time, short-time, and instantaneous overload and short-circuit protection, and is rated 1200A at 600VAC. The PowerPacT R-Frame breaker is UL Listed, CSA certified, and IEC compliant, making it suitable for demanding low-voltage distribution applications.

Key Features

  • Current Rating: 1200A continuous current rating for heavy-duty three-phase power distribution.
  • Voltage Rating: 600VAC rated for demanding low-voltage switchboard systems.
  • Trip Unit: Micrologic 5.0 A LSI electronic trip unit provides long-time, short-time, and instantaneous (LSI) protection against overloads and short circuits.
  • Configuration: Three-phase, 3-pole, busbar-mounted design (Mounting Location: busbar) for integration into FlexSet switchboard assemblies.
  • Continuous Current Rating: Rated at 80% continuous current rating per PowerPacT R-Frame specification.
  • Environmental Design: Mercury-free construction with halogen-free plastic parts and RoHS Eur compliance with exemptions.
  • Service Life: Average life duration of 15 years for long-term reliability.
  • Country of Origin: Manufactured in the United States.

Certifications & Compliance

  • UL Listed
  • CSA Certified
  • IEC Compliant
  • ROHS Eur In Scope, Compliant with Exemptions
  • Mercury Free

Technical Specifications

  • Sustainable Packaging: No
  • Mercury Free: Yes
  • Packaging Without Single Use Plastic: No
  • ROHS Eur In Scope: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • Serviceability: Yes
  • With Recycled Cardboard: Yes
  • WEEE Product Category: 5
  • China ROHS In Scope: No
  • Return Indicator: Y
  • Take Back: No
  • Returnability: Yes
  • Legacy WEEE Scope: In
  • China ROHS Regulation: Product out of China RoHS scope. Substance declaration for your information.
  • Packaging Made With Recycled Cardboard: Yes
  • EOLI Availability Display: Yes
  • Line Rated Current: 1200 A
  • Without Single Use Plastic: No
  • Device Type: LV equipment - Low voltage circuit breaker

Typical Applications

  • Commercial and Industrial Switchboard Assemblies
  • Low-Voltage Three-Phase Power Distribution
  • Busbar-Mounted Circuit Protection
  • Panelboard and Switchgear Integration
  • New Construction and Facility Retrofit Electrical Systems

Why Square D?

Square D PowerPacT R-Frame breakers combine Micrologic electronic trip technology with UL Listed, CSA, and IEC certified construction to deliver dependable, code-compliant protection for critical three-phase power distribution. Backed by a 15-year average service life and mercury-free, halogen-free materials, this FlexSet Switchboard busbar breaker is built for long-term performance in demanding commercial and industrial environments.

Manufacturer Resources

Product Specs

Product Type:
Circuit Breaker
Amperage Rating:
1200A
Voltage Rating:
600VAC
Configuration:
Busbar Mount
Listing:
UL Listed
Country of Origin:
United States
Series:
FlexSet Switchboards
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Power Distribution Blocks

Square D RKF36120U43AFLEX – Frequently Asked Questions

1) Is the Square D RKF36120U43AFLEX breaker a plug-in unit or does it bolt to the switchboard busbar?
It's a busbar-mounted R-Frame breaker, built to land directly on the bus inside a FlexSet switchboard assembly rather than being installed as a standalone enclosed unit. That means you need an existing FlexSet section with the matching bus connection to receive it; there is no separate enclosure or panelboard interior included.
2) Will this Square D breaker work on a 480V or 600V three-phase service?
Yes on both. The breaker is rated 600VAC, so it covers 480Y/277V and 600V three-phase systems as well as anything below. It is a 3-pole device for three-phase distribution, not a single-phase or 4-pole application.
3) What protection does the Micrologic 5.0 A trip unit give me, and can I set it?
The 5.0 A is an LSI electronic trip unit: long-time for overload, short-time for coordinating with downstream devices, and instantaneous for bolted faults. The L, S and I functions are adjustable, which is what lets you selectively coordinate a 1200A main or feeder against smaller branch breakers. Note the 5.0 A does not include ground-fault protection; if the job specifies GF, you need a 6.0-series trip unit instead.
4) Do I order the exact part number RKF36120U43AFLEX, or will another R-Frame breaker drop into my FlexSet section?
Order by the full catalog number. RKF36120U43AFLEX encodes the frame, 3 poles, 1200A sensor, the interrupting rating class and the Micrologic 5.0 A trip, plus the FlexSet suffix for the busbar-mounted switchboard version. An R-Frame with a different suffix may be a lug-connected or unit-mount version that will not land on the FlexSet bus.
5) Can I replace this 1200A switchboard breaker with an ABB molded case breaker?
Not as a direct swap. The ABB molded case breakers we carry, such as the A2A150TT in the A2 Series, the E150 Series 3-pole thermal magnetic, and the XT4 Series kit, are standalone MCCBs, not FlexSet busbar-mounted devices, so they will not connect to a Square D FlexSet bus structure. For a like-for-like replacement in an existing FlexSet section, stay with the Square D PowerPacT R-Frame FlexSet catalog number.
6) What is the difference between the Square D RKF36120U43AFLEX and the ABB E150 three-pole thermal magnetic breaker?
The difference is the trip technology and the mounting. The Square D RKF36120U43AFLEX uses a Micrologic 5.0 A LSI electronic trip unit, giving adjustable long-time, short-time and instantaneous protection, and it is a busbar mount device for switchboard assemblies. The ABB TEB is an E150 Series three-pole thermal magnetic circuit breaker, using a thermal element and magnetic element rather than an electronic trip unit. Choose the electronic trip where you need to coordinate settings with downstream devices.
7) Is this breaker acceptable for a job that requires UL Listed and CSA certified equipment?
It is UL Listed, CSA certified and IEC compliant, which covers US and Canadian inspection on low-voltage switchboard work. For institutional and government specs it is also mercury-free, uses halogen-free plastics, and is RoHS Eur compliant with exemptions. Country of origin is the United States, which matters if the project carries domestic-sourcing language.
8) How does the ABB XT4 three-pole molded case breaker kit compare to the Square D FlexSet PowerPacT R busbar breaker?
The ABB MBB33 is an XT4 Series three-pole molded case circuit breaker kit, an XT-frame MCCB package. The Square D RKF36120U43AFLEX is a PowerPacT R-Frame breaker in busbar mount configuration, rated 1200A at 600VAC with a Micrologic 5.0 A LSI trip unit, intended to drop into a FlexSet switchboard section. If the drawing calls for a breaker landing on switchboard bus at 1200A, the R-Frame unit is the one that matches that prep; the XT4 kit serves enclosed or panel-mounted MCCB applications.
9) Is a PowerPacT R-Frame breaker field serviceable, or is it a sealed replace-only device?
Square D lists the R-Frame as serviceable, and the trip unit is a separate electronic module rather than a sealed thermal-magnetic assembly, so trip unit replacement and setting changes are done in the field. Average service life is given as 15 years, which is the figure to plan replacement cycles around in a facility maintenance program.
How fast can I get the Square D RKF36120U43AFLEX 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 Square D RKF36120U43AFLEX come with a warranty?
Absolutely. The Square D RKF36120U43AFLEX 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 Square D RKF36120U43AFLEX?
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
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