Square D PowerPacT M-Frame 3-P...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$10,071.74
Square D PowerPacT M-Frame 3-Pole Molded Case Circuit Breaker, 18kA, ET 1.0

Square D PowerPacT M-Frame 3-Pole Molded Case Circuit Breaker, 18kA, ET 1.0

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Model: MGL36400

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

$10,071.74
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Square D PowerPacT M Molded Case Circuit Breaker

The Square D PowerPacT M Molded Case Circuit Breaker delivers dependable overload and short-circuit protection for commercial and industrial electrical systems. Configured as a 400A, 3 pole breaker rated 600VAC with an 18kA interrupt capacity, this PowerPacT M-Frame unit features an ET 1.0 electronic trip unit and an 80% continuous current rating for reliable, code-compliant performance.

Key Features

  • Frame Rating: 400A PowerPacT M-Frame breaker with an 80% continuous current rating for demanding load applications.
  • Pole Configuration: 3 pole design (2-pole versions also available) for flexible system protection.
  • Voltage Rating: 600VAC rated operational voltage (Ue) with a 750V rated insulation voltage (Ui) per IEC 60947-2.
  • Interrupt Capacity: 18kA rated interrupting capacity for robust short-circuit protection.
  • Lug Connections: Line and load lug terminals accept 3 x AWG 3/0...3 x 500 kcmil aluminum/copper conductors, tightened to 50-50 N.m.
  • Trip Unit: ET 1.0 basic electronic trip unit with a local green trip indicator for at-a-glance status.
  • Operating Altitude: Rated for use up to 13123.36 ft (4000 m) with derating, and below 6561.68 ft (2000 m) without derating.

Certifications & Compliance

  • UL Listed
  • CSA Certified
  • NOM-003-SCFI-2000 Compliant
  • NEMA Standards
  • IEC 60947-2 Compliant

Technical Specifications

  • Warranty: 18 months
  • Warranty Period: 18 months
  • Sustainable Packaging: Yes
  • Mercury Free: Yes
  • Packaging Without Single Use Plastic: Yes
  • Tier Id: 1
  • ROHS Eur In Scope: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • Poles Description: 3P
  • Serviceability: Yes
  • With Recycled Cardboard: Yes
  • WEEE Product Category: 4
  • China ROHS In Scope: No
  • Return Indicator: Y
  • Terminal Identifier: AL800M23K
  • Take Back: No
  • Quantity Per Set: 1
  • Tier: 1
  • Returnability: Yes
  • Field Service Division: PPIBS
  • Magnetic Tripping Current: 800-4000 A

Typical Applications

  • Commercial and Industrial Electrical Distribution Systems
  • Panelboard and Switchboard Circuit Protection
  • Motor and Feeder Circuit Protection
  • Renovation and New Construction Electrical Projects

Why Square D?

Square D PowerPacT M-Frame breakers are built with UL Listed and CSA Certified components and carry an average life duration of 15 years, giving contractors and panel builders a serviceable, field-upgradeable breaker with a wide range of field-installable accessories. Backed by an 18-month warranty, the PowerPacT M-Frame delivers dependable, code-compliant protection for commercial and industrial power systems.

Manufacturer Resources

Product Specs

Department:
Electrical
Listing:
UL Listed
Configuration:
3-Pole
Product Type:
Circuit Breaker
Product Color:
Black
Product Group:
Circuit Protection
Product Subgroup:
Circuit Breakers
Product Depth:
8.05 in
Product Width:
8.27 in
Product Height:
12.86 in

Square D MGL36400 – Frequently Asked Questions

1) What size conductors will the PowerPacT M-Frame MGL lugs take, and what is the torque?
The line and load lug terminals accept 3 x AWG 3/0 through 3 x 500 kcmil aluminum or copper conductors per pole, torqued to 50 N.m. If your feeder run calls for larger than 500 kcmil per phase, you will need a different termination arrangement, not this lug kit.
2) Is 18kA enough interrupting capacity for my 480V switchboard?
The MGL M-Frame is rated 18kA interrupting at 600VAC rated operational voltage, with 750V rated insulation voltage per IEC 60947-2. That means the available fault current at the point of installation must be 18kA or less, or the breaker has to be series-rated by the equipment manufacturer. Many 480V commercial switchboards see available fault current well above 18kA, so check your coordination study before specifying this one.
3) Can I load the 400A PowerPacT MGL breaker to its full 400 amps continuously?
No. The MGL M-Frame carries an 80% continuous current rating, so a 400A frame is good for 320A continuous in normal enclosed applications. Size the frame above your calculated continuous load accordingly, or step up to the 500A, 600A or 800A version.
4) Is the Square D PowerPacT MGL breaker UL Listed and acceptable for an inspected commercial job?
Yes. The PowerPacT M-Frame MGL is UL Listed and CSA Certified, built to NEMA standards, compliant with IEC 60947-2, and NOM-003-SCFI-2000 compliant. It is manufactured in Mexico.
5) What adjustment does the ET 1.0 trip unit on the PowerPacT M give me?
ET 1.0 is the basic electronic trip unit: magnetic tripping current is adjustable across 800 to 4000 A, and a local green trip indicator shows status at the breaker. If you need ground fault protection, metering, or long-time and short-time curve shaping for selective coordination, ET 1.0 is not the trip unit for that job.
6) How much panel space does the PowerPacT M-Frame breaker need?
Plan for a unit measuring 12.86 x 8.27 x 8.05 inches (height, width, depth). The case is black. Confirm your panelboard or switchboard section depth against the 8.05 inch figure before you commit, since M-Frame is a physically large molded case breaker.
7) Can I use the M-Frame MGL for motor feeder protection?
Motor and feeder circuit protection is a listed application for the M-Frame, and the 500A, 600A and 800A variants are catalogued against motor FLA values of 500A, 600A and 800A respectively, with the 400A unit as the standard FLA option. Match the breaker to the motor full load amps your drawing calls out.
8) What other 400A 3-pole molded case breakers could I use instead of the Square D MGL36400?
Among other brands carried, the Eaton Series C K-Frame mining circuit breaker is a 400A 3-pole molded case unit with an interchangeable rating plug, which gives you field-changeable amp settings the ET 1.0 M-Frame does not. ABB's A2 Series (A2A150TT) and the XT4 and XT5 kits are the ABB-side 3-pole molded case options. Note these are different frames with different mounting and termination arrangements, so swapping brands means re-checking the enclosure fit, not just the amp rating.
9) Will an ABB ST200M miniature breaker or a Bussmann CBC automotive breaker work in place of a PowerPacT M-Frame?
No, those are different classes of device. The ABB ST200M is a miniature circuit breaker with a C-curve built to UL1077, a supplementary protector rather than a branch-circuit breaker, and the Bussmann CBC series is a Type I automotive circuit breaker rated 14VDC. The Square D PowerPacT M-Frame MGL breakers are UL Listed, CSA certified molded case breakers rated 600VAC with 18kA interrupting capacity for commercial and industrial distribution.
10) What is the difference between the Square D PowerPacT M-Frame and the ABB A2A150TT?
Both are 3-pole molded case circuit breakers. The ABB A2A150TT is an A2N series breaker from ABB's A2 frame. The Square D PowerPacT M-Frame covers MGL36400 at 400A plus MGL36500, MGL36600 and MGL36800 in the 500 to 800A range, all 3-pole, 600VAC, 18kA interrupting, with an ET 1.0 electronic trip unit, an 80 percent continuous current rating and magnetic tripping current adjustable 800 to 4000 A. The A2 frame is a smaller-frame ABB product line with its own mounting and accessory ecosystem.
11) Do I need to derate this breaker if it is installed at high altitude?
Below 6,561.68 ft (2,000 m) no derating applies. The M-Frame is rated for use up to 13,123.36 ft (4,000 m) with derating, so installations between those elevations need the altitude correction applied to voltage and current ratings.
12) Can the PowerPacT M-Frame be serviced or fitted with accessories after installation?
Yes, the M-Frame is a serviceable, field-upgradeable breaker with a range of field-installable accessories, and Square D cites an average life duration of 15 years. For panel builders that means auxiliary contacts and similar add-ons can go on in the field rather than requiring a factory-built assembly.
How fast can I get the Square D MGL36400 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 MGL36400 come with a warranty?
Absolutely. The Square D MGL36400 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 MGL36400?
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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