Square D QO-3201021 QO 3-Pole ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$389.07
Square D QO-3201021 QO 3-Pole Shunt Trip Miniature Circuit Breaker, 120/240VAC, 10kA

Square D QO-3201021 QO 3-Pole Shunt Trip Miniature Circuit Breaker, 120/240VAC, 10kA

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Model: QO3501021

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

$389.07
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Square D QO 3-Pole Shunt Trip Miniature Circuit Breaker, 120/240VAC, 10kA

The Square D QO 3-pole miniature circuit breaker delivers thermal magnetic overcurrent protection and switching for AC and DC systems, rated 120/240VAC (also available at 240VAC and 120VAC) with a 10kA interrupt rating. This QO range breaker is offered across a family of Motor FLA ratings from 20A through 100A, so electrical professionals can select the correct current rating for the connected motor load while every option shares the same trip-free toggle design, shunt trip accessory compatibility, and 120/240VAC voltage platform. Built with an over-center, trip-free toggle mechanism for quick-make, quick-break action, the breaker includes an AC shunt trip accessory rated 120/208/240VAC for remote tripping. It is UL Listed and CSA certified, making it a reliable choice for plug-in panelboard installations that demand dependable, code-compliant circuit protection.

Key Features

  • Pole Configuration: 3-pole (3P) design for multi-circuit overcurrent protection and switching.
  • Motor FLA Range: Available in 20A, 50A, 80A, and 100A ratings to match a range of motor load requirements.
  • Trip-Free Toggle Mechanism: Over-center, trip-free toggle with quick-make, quick-break action for positive, reliable operation on AC and DC systems.
  • Voltage Rating: Rated 120/240VAC (also available at 240VAC and 120VAC) to match a range of residential and light commercial applications.
  • Interrupt Rating: 10kA interrupt rating for dependable fault protection.
  • AC Shunt Trip Accessory: Shunt trip rated 120/208/240VAC enables remote tripping of the breaker for added control and safety.
  • Wire Range: Accepts AWG 8...AWG 2 copper or aluminum conductors for flexible field wiring.
  • Circuit Breaker Application: HACR rated for heating, air conditioning, and refrigeration circuit protection.
  • Operating Temperature: Rated for ambient air temperature up to 40°C.
  • Space Requirement: Requires 4 panel spaces in compatible QO load centers and panelboards.

Certifications & Compliance

  • UL Listed
  • CSA Certified
  • HACR Rated

Technical Specifications

  • Series: QO
  • Standards: CSA
  • Poles Description: 3P
  • Number Of Spaces Required: 4
  • Warranty: 18 months
  • Mercury Free: Yes
  • Toxic Heavy Metal Free: Yes
  • Without Single Use Plastic: Yes

Typical Applications

  • Residential and Light Commercial Load Centers
  • Plug-In Panelboard Overcurrent Protection
  • AC and DC Circuit Protection Systems
  • HACR Circuits (Heating, Air Conditioning, Refrigeration)
  • Motor Overload Circuits Across a Range of FLA Ratings
  • Remote Tripping Applications via AC Shunt Trip Accessory

Why Square D?

Square D engineers the QO range of miniature circuit breakers for dependable, code-compliant performance, backed by UL Listing and CSA certification. This breaker is a Green Premium product that is mercury-free, halogen-free, and built without single-use plastic, giving electrical professionals a trusted, reliable solution across the full 20A-100A Motor FLA range for plug-in panelboard installations.

[{"name": "Product Type", "value": "Circuit Breaker"}, {"name": "Series", "value": "QO"}, {"name": "Standards", "value": "CSA"}, {"name": "Voltage Rating", "value": "120/240VAC"}, {"name": "Configuration", "value": "3-Pole"}, {"name": "Listing", "value": "UL Listed"}]

Manufacturer Resources

Product Specs

Product Type:
Circuit Breaker
Series:
QO
Configuration:
3-Pole
Voltage Rating:
120/240VAC
Connection Type:
Plug-In
Listing:
UL Listed
Standards:
CSA
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Circuit Breakers
Product Width:
2.99 in
Product Depth:
2.91 in

Square D QO3501021 – Frequently Asked Questions

1) Will a Square D QO 3-pole shunt trip breaker fit in my existing QO load center?
It is a plug-in breaker, so it drops into compatible QO load centers and panelboards, but it needs 4 panel spaces, not 3. The shunt trip mechanism sits alongside the breaker body, which is why the footprint is wider than a standard 3-pole QO. Overall the breaker measures 2.99 in wide by 2.91 in deep. Confirm you have four contiguous spaces on the bus before ordering.
2) What wire size can I land on the Square D QO 3-pole shunt trip breaker?
The lugs accept AWG 8 through AWG 2 conductors, copper or aluminum. That range covers the typical feeder sizes for the 20A through 100A ratings in the family. If your design calls for larger than 2 AWG on a 100A run, you are outside what these lugs will take.
3) Is a 10kA breaker enough, or do I need a molded case breaker instead?
The QO shunt trip breaker is a miniature plug-in breaker with a 10kA interrupting rating, which suits residential and light commercial load centers. If your available fault current at the panel exceeds 10kA, or you need a higher frame size than 100A, move to a molded case device such as the ABB A2N Series A2A150TT 3-pole or the Eaton Series C K-Frame 400A 3-pole with interchangeable rating plug. Those are bolted frame breakers, not QO plug-in, so they require a different enclosure or panel.
4) What is the closest 3-pole alternative to a Square D QO shunt trip breaker if the panel is not a QO plug-in panelboard?
The Square D QO 3-pole shunt trip breaker is a plug-in connection breaker, so it seats only in compatible QO load centers and panelboards. If the panel takes bolt-on breakers instead, the Eaton BAB Quicklag three-pole thermal-magnetic breaker rated 240V is the nearer match in format, and the Eaton BAB series Quicklag breaker is also a bolt-on thermal-magnetic design. Confirm the panel's interior accepts the BAB mounting before ordering, since plug-in and bolt-on interiors are not interchangeable.
5) Is a molded case breaker like the ABB A2A150TT a substitute for the Square D QO 3-pole shunt trip breaker?
They are different breaker classes. The Square D QO unit is a miniature circuit breaker that plugs into a QO panelboard interior and occupies 4 panel spaces, measuring 2.99 in wide by 2.91 in deep. The ABB A2A150TT is an A2 Series 3-pole molded case circuit breaker, a frame-mounted device that is installed in its own enclosure or a panel built for that frame rather than dropped into a plug-in QO interior. Use the molded case unit where the drawing calls out an MCCB frame; use the QO where the existing QO panel is staying.
6) Can I use this breaker on a rooftop HVAC or refrigeration circuit?
Yes, it is HACR rated, which is what inspectors look for on heating, air conditioning, and refrigeration branch circuits. It also carries a 10kA interrupting rating and is rated for ambient air up to 40 degrees C, so a hot mechanical room or a rooftop enclosure above that temperature needs a derating review.
7) Is the QO 3-pole shunt trip breaker approved for use in Canada?
It is UL Listed and CSA certified, so it is acceptable on both sides of the border. Country of origin is Mexico, which matters if you are filing trade or domestic-content paperwork on a public project.
8) What is the difference between this QO breaker and an Eaton BAB 3-pole?
Both are 3-pole thermal-magnetic miniature breakers for 240V work, but they are not interchangeable in a panel. The QO is a plug-in device for QO load centers; the Eaton BAB Quicklag 3-pole is an Eaton bus device, and the BAB1010 version is bolt-on rather than plug-in. The QO shunt trip version also carries a factory AC shunt trip for remote tripping, which a plain BAB does not. Match the breaker to the panel brand and bus style you already have.
9) After a shunt trip operates, does the breaker reset itself?
No. The QO uses an over-center, trip-free toggle with quick-make, quick-break action, so once it trips, whether from the shunt trip coil or from overcurrent, the handle must be moved to OFF and then back to ON by hand at the panel. Plan for that if the trip source is a remote fire alarm or elevator shutdown circuit.
10) Is this breaker suitable for a supplementary protection application like a control panel?
No. The QO 3-pole shunt trip breaker is a branch circuit breaker for plug-in panelboards and load centers. For supplementary protection inside equipment or a control enclosure, a UL1077 device like the ABB ST200M Series C-curve miniature circuit breaker is the right category, and it mounts on DIN rail rather than a QO bus.
11) Will a Bussmann CBC or CBF automotive circuit breaker work in place of a Square D QO 3-pole breaker?
No. The Square D QO 3-pole breaker is a 120/240VAC panelboard breaker that plugs into a QO interior. The Bussmann CBC series is a Type I automotive circuit breaker rated 14VDC and the Bussmann CBF series is a Type II automotive breaker, both intended for low-voltage vehicle and equipment wiring rather than building branch circuits. They share the circuit breaker name only.
12) For a high-amperage 3-pole feeder beyond what the QO shunt trip breaker covers, what else is available?
The Square D QO 3-pole shunt trip breaker family runs from 20A through 100A Motor FLA. Above that range, step to a molded case frame: the Eaton Series C K-frame mining circuit breaker is a 400A 3-pole unit with an interchangeable rating plug, and the ABB XT5 3-pole circuit breaker kit is another 3-pole molded case option. Both are frame devices rather than QO plug-in breakers, so the enclosure and bussing change with them.
How fast can I get the Square D QO3501021 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 QO3501021 come with a warranty?
Absolutely. The Square D QO3501021 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 QO3501021?
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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