Square D PowerPacT M-Frame Cir...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$16,072.59
Square D PowerPacT M-Frame Circuit Breaker, 3-Pole, 600VAC, Adjustable Trip

Square D PowerPacT M-Frame Circuit Breaker, 3-Pole, 600VAC, Adjustable Trip

(No reviews yet) Write a Review

Model: MJL36800E10

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

$16,072.59
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Square D PowerPacT M-Frame Circuit Breaker, 3-Pole, 600VAC, Adjustable Trip

The Square D PowerPacT M-Frame Circuit Breaker delivers dependable overcurrent protection for commercial and industrial electrical distribution systems. Available in ratings from 300A to 800A, this 3-pole, 600VAC breaker features an adjustable electronic trip unit with a 25 kA interrupt rating, giving installers flexibility to match protection precisely to load requirements. Lug-style line and load connections simplify termination, and the PowerPacT M-Frame platform is backed by UL, CSA, and NOM certifications for use across North American electrical installations.

Key Features

  • Amperage Range: 300A to 800A adjustable trip settings allow precise coordination with downstream loads and equipment ratings.
  • 3-Pole Configuration: Built for three-phase circuit protection in commercial and industrial panelboards and switchboards.
  • 600VAC Rated: Rated operational voltage of 600 V AC at 50/60 Hz (UL 489), suitable for a wide range of distribution systems.
  • 25 kA Interrupt Rating: Delivers 25 kA rated service breaking capacity at 380/415 V AC per IEC 60947-2 for dependable short-circuit protection.
  • Adjustable Electronic Trip: ET 1.0 basic electronic trip unit permits field adjustment of the long-time trip setting to match load requirements.
  • Lug Connections: Line and load lug terminals accept 3 x AWG 3/0 through 3 x 500 kcmil aluminum or copper conductors, tightened to 50 N.m.
  • Magnetic Tripping Current: 1600-8000A magnetic trip range provides fast instantaneous response to short-circuit conditions.
  • Unit Mount, Lug: Configured for standard unit-mount lug installation in PowerPacT M-Frame enclosures and panels.

Certifications & Compliance

  • UL Listed
  • CSA Certified
  • NOM Compliant (NOM-003-SCFI-2000)
  • Conforms to NEMA and IEC 60947-2 Standards

Technical Specifications

  • Poles Description: 3P
  • Magnetic Tripping Current: 1600-8000 A
  • Terminal Identifier: AL800M23K
  • Quantity Per Set: 1
  • Sustainable Packaging: Yes
  • Mercury Free: Yes
  • Packaging Without Single Use Plastic: Yes
  • With Recycled Cardboard: Yes
  • ROHS Eur In Scope: Yes

Typical Applications

  • Commercial and Industrial Electrical Distribution
  • Panelboard and Switchboard Circuit Protection
  • Three-Phase Motor and Feeder Circuit Protection
  • Power Distribution Upgrades and Retrofits
  • New Construction and Renovation Projects

Why Square D?

Square D is a trusted name in electrical distribution equipment, and the PowerPacT M-Frame series reflects that reputation with UL-, CSA-, and NOM-certified construction built to IEC 60947-2 standards. With an adjustable electronic trip unit, 25 kA interrupt rating, and rugged lug connections rated for large aluminum or copper conductors, this breaker gives electrical contractors and panel builders the flexibility and reliability needed for demanding commercial and industrial installations.

Manufacturer Resources

Product Specs

Product Type:
Circuit Breaker
Configuration:
3-Pole
Voltage Rating:
600VAC
Amperage Rating:
300A - 800A
Connection Type:
Lugs
Listing:
UL Listed
Product Color:
Black
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Circuit Breakers

Square D MJL36800E10 – Frequently Asked Questions

1) What size conductors will the Square D PowerPacT M-Frame breaker lugs accept?
The line and load lugs on the PowerPacT M-Frame breaker take 3 x AWG 3/0 through 3 x 500 kcmil, aluminum or copper, torqued to 50 N.m. That is per pole on a 3-pole breaker, so plan for three conductors per terminal if you are running parallel sets. The terminal identifier is AL800M23K.
2) Can I use this Square D M-Frame breaker on a 480V three-phase feeder?
Yes. The M-Frame breaker is rated 600 V AC at 50/60 Hz under UL 489, so 480Y/277 and 480 delta systems are within rating, and it is a 3-pole device built for three-phase feeders and motor circuits.
3) What does the adjustable trip on the PowerPacT M-Frame actually let me change in the field?
It carries the ET 1.0 basic electronic trip unit, which lets you adjust the long-time trip setting in the field so the breaker coordinates with the downstream load rather than forcing you to swap the breaker. The instantaneous magnetic trip range is 1600 to 8000 A. Frame ratings span 300A to 800A.
4) Is 25 kA enough interrupting capacity for my service, or do I need a higher AIC breaker?
The M-Frame is listed at 25 kA rated service breaking capacity at 380/415 V AC per IEC 60947-2. If your available fault current at the point of installation exceeds that, this breaker is the wrong choice and you need a higher interrupting rating or series-rated protection upstream. Get the fault current from your coordination study before you commit.
5) Will this M-Frame breaker bolt into an existing panelboard, or does it need its own mounting?
It ships as a unit-mount, lug-connected breaker, meant to be mounted in PowerPacT M-Frame enclosures and panels rather than plugged onto bus like a branch breaker. There is no plug-in or bolt-on bus connection here, so you terminate cable directly to the lugs. If you need a bolt-on branch device for a lighting or receptacle panel, a thermal-magnetic bolt-on like the Eaton BAB Quicklag is that type of breaker instead.
6) What is the closest alternative to the Square D PowerPacT M-Frame MJL36800E10 if I need a 3-pole molded case breaker from another manufacturer?
The Square D PowerPacT M-Frame MJL36800E10 is a 3-pole, 600VAC molded case breaker with lug line and load connections and an adjustable electronic trip. For a 3-pole molded case breaker from another manufacturer, the ABB XT5 3-pole circuit breaker kit and the ABB A2A150TT in the A2 Series are both 3-pole molded case designs, and the Eaton Series C K-Frame mining breaker is a 400A 3-pole unit with an interchangeable rating plug. Confirm frame size, interrupting rating and panel mounting against your drawing, since frame platforms are not interchangeable between manufacturers.
7) I only need a 240V three-pole breaker for a small branch panel - is the PowerPacT M-Frame overkill?
Yes, for a small branch circuit it likely is. The PowerPacT M-Frame MJL36800E10 is a 600VAC, 3-pole breaker with a 300A to 800A adjustable trip range, sized for feeder and switchboard duty. For a lower-current three-pole branch load at 240V, the Eaton BAB Quicklag three-pole industrial thermal-magnetic breaker is rated 240V, and the Eaton BAB1010 is a bolt-on thermal-magnetic Quicklag unit. Those are plug-on or bolt-on panelboard breakers rather than lug-terminated molded case frames, so the panel interior has to match.
8) Which model do I order for the 800A PowerPacT M-Frame breaker?
The 3-pole, 600VAC unit-mount lug version is Square D part number MJL36800E10, with the ET 1.0 electronic trip. Specify by that MPN so you get the lug terminations and the adjustable electronic trip rather than a fixed thermal-magnetic unit.
9) Is this breaker approved for use in Canada and Mexico as well as the US?
It is UL Listed, CSA Certified and NOM compliant to NOM-003-SCFI-2000, and it conforms to NEMA and IEC 60947-2. That covers the three North American approval regimes, which matters on multi-site industrial packages and OEM panels shipping across borders.
10) Electronic trip versus thermal-magnetic molded case breaker, which should I spec for a feeder?
Go electronic when you need selective coordination. The M-Frame's ET 1.0 unit lets you tune the long-time pickup on site, so one frame covers a range of load settings and you can coordinate with downstream devices. A thermal-magnetic breaker, such as the Eaton BAB Quicklag 3-pole or the Eaton Series C K-Frame with an interchangeable rating plug, is set by its curve or plug and is simpler but less adjustable. For large three-phase feeders where the study calls out specific pickup values, the adjustable electronic unit is the easier device to live with.
11) I need a 3-pole molded case breaker but not a Square D one. What else is comparable?
For 3-pole molded case duty, ZenSupply also carries ABB: the A2A150TT from the A2 Series, plus the XT4 Series kit (MBB33) and the XT5 3-pole kit (MBM334). Note those ABB items are a different platform, so terminations, trip units and enclosure prep will not interchange with a PowerPacT M-Frame. Miniature breakers like the ABB ST200M C-curve (UL 1077) are supplementary protectors, not a substitute for a UL 489 feeder breaker.
12) Is the Eaton NZM undervoltage release an accessory I can add to the PowerPacT M-Frame breaker?
No. The Eaton 10250T series undervoltage release is built for Eaton NZM molded case circuit breakers, and breaker accessories are frame-specific. The Square D PowerPacT M-Frame MJL36800E10 ships as a unit-mount lug breaker with an ET 1.0 basic electronic trip unit; any shunt trip or undervoltage accessory for it has to be the PowerPacT M-Frame accessory, not an NZM part.
13) My spec allows an interchangeable rating plug instead of an adjustable electronic trip - what are my options?
The Square D PowerPacT M-Frame MJL36800E10 meets a rating requirement through field adjustment: its ET 1.0 electronic trip unit lets you set the long-time trip anywhere in the 300A to 800A range. If your spec calls for a fixed, swappable rating plug instead, the Eaton Series C K-Frame mining circuit breaker is a 400A 3-pole unit supplied with an interchangeable rating plug. The difference is how the ampere setting is established - dial adjustment versus a replaceable plug - so confirm which approach the engineer accepted.
14) What should I look at if the PowerPacT M-Frame is too large a frame for my enclosure?
The PowerPacT M-Frame MJL36800E10 is an 800A-class frame with lug terminals accepting 3 x AWG 3/0 through 3 x 500 kcmil conductors, so it needs substantial gutter and bending space. For a smaller three-pole molded case frame, the ABB XT4 series 3-pole molded case breaker kit sits below the XT5 in ABB's frame lineup, and the ABB A2A150TT is an A2 Series 3-pole molded case breaker. Verify frame dimensions and the panel's breaker mounting pattern before committing, since each manufacturer's frame has its own footprint.
15) Does this Square D breaker meet RoHS and sustainable packaging requirements for a green building project?
It is in scope for European RoHS and is mercury free. Packaging is single-use-plastic free and uses recycled cardboard. For LEED documentation or a sustainable procurement spec, those are the attributes Square D publishes on the M-Frame.
16) Is the Square D PowerPacT M-Frame breaker sold individually?
Yes, quantity per set is 1, so one order line gets you one complete 3-pole breaker. Lugs are part of the unit-mount configuration; conductors, enclosure and any accessories are separate.
How fast can I get the Square D MJL36800E10 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 MJL36800E10 come with a warranty?
Absolutely. The Square D MJL36800E10 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 MJL36800E10?
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 Square D MJL36800E10 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.
!