Square D QO 1-Pole Plug-In Min...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$28.56
Square D QO 1-Pole Plug-In Miniature Circuit Breaker

Square D QO 1-Pole Plug-In Miniature Circuit Breaker

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Model: QO150

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

$28.56
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Square D QO 1-Pole Plug-In Miniature Circuit Breaker

The Square D QO 1-Pole Plug-In Miniature Circuit Breaker delivers reliable thermal magnetic overcurrent protection and switching for AC and DC systems in QO series load centers. This family is offered across a range of amperage ratings from 10A to 200A, letting you match the correct breaker to the branch circuit or motor load you are protecting. Every option shares the same 120/240 V AC and 120 V AC operational voltage rating, an over-center, trip-free toggle mechanism with quick-make, quick-break action, and a 1-pole, plug-in mounting design for fast, tool-friendly installation into compatible QO series load centers. The line is UL Listed, CSA certified, and HACR rated for use on heating, air conditioning, and refrigeration circuits, making it well suited to residential panelboards.

Key Features

  • Amperage Range: Available in ratings from 10A up to 200A to match specific branch circuit or motor load requirements.
  • Configuration: 1-Pole, plug-in mounting design for fast, tool-friendly installation into compatible QO series load centers.
  • Trip Mechanism: Over-center, trip-free toggle mechanism provides quick-make, quick-break switching action across the entire range.
  • Voltage Rating: Rated for 120/240 V AC and 120 V AC operational voltage systems.
  • Wire Range: Accepts AWG 14...AWG 8 copper or aluminum conductors.
  • Application Rating: HACR rated, suitable for heating, air conditioning, and refrigeration circuit protection.
  • Operating Temperature: Rated for 40 °C ambient air temperature for operation.
  • Device Type: LV equipment - low voltage circuit breaker for overcurrent protection and switching on AC and DC systems.

Certifications & Compliance

  • UL Listed
  • CSA
  • HACR Rated
  • RoHS Compliant
  • Mercury Free
  • Toxic Heavy Metal Free

Technical Specifications

  • Series: QO
  • Voltage Rating: 120/240V
  • Standards: CSA
  • Amperage Options: 10A, 15A, 20A, 30A, 40A, 45A, 50A, 60A, 70A, 90A, 100A, 200A
  • Warranty Period: 18 months
  • Mercury Free: Yes
  • ROHS Eur Status: Compliant
  • China ROHS In Scope: No
  • Recycled Metal Content At Cr Level: 0 %

Typical Applications

  • Residential Load Centers and Panelboards
  • QO Series Circuit Breaker Panels
  • Branch Circuit Overcurrent Protection
  • HVAC and HACR-Rated Circuits
  • Residential Service Upgrades

Why Square D?

Manufactured by Schneider Electric, Square D QO circuit breakers pair a trip-free toggle mechanism with UL Listed, CSA certified performance for dependable, code-compliant overcurrent protection across the full 10A-200A range. Backed by an 18-month warranty and recognized as a Green Premium product, this mercury-free breaker suits reliable residential electrical service for the branch circuit or amperage rating your panel requires.

Manufacturer Resources

Product Specs

Product Type:
Circuit Breaker
Series:
QO
Configuration:
1-Pole
Voltage Rating:
120/240V
Listing:
UL Listed
Standards:
CSA
Department:
Electrical
Product Group:
Wiring Devices
Amperage Rating:
10A - 200A
Product Subgroup:
Circuit Breakers

Square D QO150 – Frequently Asked Questions

1) Will a Square D QO breaker fit in any panel, or only a QO load center?
The QO plug-in breaker is built to plug into Square D QO series load centers and panelboards, and that is the only mounting it is designed for. It is not a Homeline breaker and it is not interchangeable with another manufacturer's bus. Check the label inside the panel door for QO before ordering.
2) What wire size can I land on a Square D QO breaker?
The lug accepts AWG 14 through AWG 8 conductors, copper or aluminum. That covers the usual 15A, 20A, 30A and 40A branch circuit runs. If your feeder is larger than #8, this breaker's lug will not take it.
3) Can I use a Square D QO breaker on the circuit for an air conditioner or heat pump?
Yes, the QO breaker is HACR rated, so it's accepted for heating, air conditioning and refrigeration branch circuits. That's the rating an HVAC contractor is looking for when the condenser nameplate calls for a HACR type breaker.
4) What amperages does the Square D QO breaker come in?
Amp ratings run 10, 15, 20, 30, 40, 45, 50, 60, 70, 90, 100 and 200 amps, ordered by part number: QO210, QO215, QO320, QO230, QO340, QO245, QO150, QO260, QO270, QO290, QO2100 and QO2200. Match the amp rating to the conductor you are protecting, keeping in mind the lug tops out at #8 AWG.
5) Is the Square D QO breaker UL Listed and CSA certified for an inspection?
Both. The QO breaker is UL Listed and carries CSA certification, which is what an AHJ will look for on a residential panelboard installation. It's also RoHS compliant and mercury free.
6) Can an ABB ST200M miniature breaker be used in place of a Square D QO breaker in a QO load center?
No. The Square D QO 1-Pole breaker is a plug-in miniature circuit breaker built to seat on the QO series load center bus, and it is UL Listed for 120/240V branch circuit protection. The ABB ST200M is a UL1077 supplementary protector, which is a different product standard than a UL Listed branch circuit breaker and uses its own mounting arrangement. For a QO panel, stay with the QO breaker.
7) What voltage is the Square D QO miniature circuit breaker rated for?
120/240 V AC, and 120 V AC operational voltage for single-pole use. That's standard residential and light commercial single-phase service. It is a low voltage thermal magnetic device for overcurrent protection and switching, not a device for 480V systems.
8) How does the QO breaker's trip mechanism work, and can I use it as a switch?
It uses an over-center, trip-free toggle with quick-make, quick-break action, so the contacts open at the same speed regardless of how fast you move the handle. Trip-free means it will still clear a fault even if someone is holding the toggle in the ON position. Square D rates it for switching as well as overcurrent protection.
9) I need a 3-pole breaker for a commercial panel, not a residential QO. What else is there?
The QO plug-in covered here is a 1-pole miniature breaker aimed at residential load centers, so it won't serve a three-phase feeder. For 3-pole work, ZenSupply carries the ABB A2N Series 3-pole molded case breaker (UL Listed), the ABB E150 Series 3-pole thermal magnetic breaker, and the ABB XT4 Series 3-pole molded case breaker kit. Those are molded case devices for switchgear and commercial panelboards, not plug-in residential breakers.
10) Is a QO breaker the same thing as a DIN rail miniature circuit breaker like the ABB ST200M?
No. The QO is a plug-in breaker that snaps onto the bus of a QO load center and is UL Listed for branch circuit protection in residential panelboards. The ABB ST200M is a UL1077 miniature circuit breaker, which is a supplementary protector class of device used in control panels and equipment, typically on DIN rail. They are not substitutes for each other.
11) What is the difference between the Square D QO breaker and an ABB XT4 molded case breaker?
They are different classes of device. The Square D QO is a plug-in miniature circuit breaker in 1-pole configuration for 120/240V systems, installed by snapping onto the bus of a QO load center. The ABB XT4 is a 3-pole molded case circuit breaker kit, a larger frame device bolted or mounted into switchgear or a distribution panel. A QO opening in a residential load center will not accept an XT4.
12) For a thermal magnetic breaker, is the ABB E150 a direct equivalent to the Square D QO?
Both use thermal magnetic tripping, but they are not interchangeable. The Square D QO is a 1-pole plug-in miniature breaker rated 120/240V for QO load centers, UL Listed and CSA certified. The ABB E150 is a 3-pole thermal magnetic molded case breaker, a different pole count and a different frame and mounting method. Match the QO panel with a QO breaker.
13) Will a QO breaker hold up in a hot attic or an unconditioned mechanical room?
The QO breaker is rated for operation at 40 degrees C ambient air temperature. Above that, standard practice is to derate the breaker for the surrounding temperature, so a panel in a space that routinely runs hotter needs that factored into the circuit sizing.
14) Do I need any tools or mounting hardware to install a Square D QO breaker?
No separate mounting hardware is needed. The QO is a plug-in design that seats directly onto the load center bus, then you land the branch conductor in the lug. For a property manager stocking spares across a building, keeping a few common amp ratings on the shelf means a tripped or failed breaker gets swapped without a panel order.
How fast can I get the Square D QO150 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 QO150 come with a warranty?
Absolutely. The Square D QO150 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 QO150?
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 QO150 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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