Square D QOB QO 22kA Bolt-On M...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$53.03
Square D QOB QO 22kA Bolt-On Miniature Circuit Breaker

Square D QOB QO 22kA Bolt-On Miniature Circuit Breaker

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Model: QOB135

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

$53.03
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Square D QO 22kA Bolt-On Miniature Circuit Breaker

The Square D QO 22kA Miniature Circuit Breaker is a thermal magnetic circuit breaker from the QO range, built for overcurrent protection and switching on AC and DC systems. This bolt-on breaker is offered across a Motor FLA range spanning 10A, 15A, 30A, 35A, 40A, 50A, 60A, 70A, 90A, and 150A, letting you match the exact rating to your motor circuit while retaining the same 22kA interrupt rating, HACR listing, and bolt-on mounting across every option. Available in 1, 2, and 3-pole configurations rated for 120 V AC or 120/240 V AC systems, it accepts AWG 8...AWG 2 copper or aluminum conductors, making it a dependable choice for panelboard upgrades and new installations.

Key Features

  • Motor FLA Range: Available from 10A up to 150A, allowing selection of the rating that matches your specific motor load.
  • QO Range: Part of the Square D QO family of thermal magnetic circuit breakers, available in 1, 2, and 3-pole configurations.
  • Mounting: Bolt-on connection secures the breaker firmly to the panelboard bus for a reliable installation.
  • Interrupt Rating: 22kA interrupt capacity supports higher fault-current applications than standard QO breakers.
  • Trip Mechanism: Over-center, trip-free toggle mechanism provides quick-make, quick-break switching with positive trip indication.
  • Voltage Rating: Rated for 120 V AC or 120/240 V AC operation depending on pole configuration.
  • Wire Range: Accepts AWG 8...AWG 2 copper or aluminum conductors.
  • Operating Temperature: Rated for ambient air operation up to 40 °C.
  • Application: HACR rated for heating, air conditioning, and refrigeration circuits.

Certifications & Compliance

  • UL Listed
  • CSA Certified
  • RoHS Compliant
  • Mercury Free

Technical Specifications

  • Series: QO
  • Voltage Rating: 120/240 VAC
  • Standards: CSA
  • Toxic Heavy Metal Free: Yes
  • Warranty Period: 18 months
  • Mercury Free: Yes
  • Range Of Product: QO
  • Environmental Disclosure: ENVPEP2111016

Typical Applications

  • Residential and Commercial Panelboards
  • Load Center Circuit Protection
  • HACR Equipment Circuits (Heating, Air Conditioning, Refrigeration)
  • Motor Circuit Protection Across a Range of FLA Ratings
  • Higher Fault-Current Electrical Systems
  • New Construction and Panel Upgrades

Why Square D?

Square D by Schneider Electric engineers the QO breaker line for reliable, code-compliant circuit protection, backed by an 18-month warranty and UL Listed, CSA certified construction. The trip-free toggle mechanism and bolt-on mounting are built for consistent performance in panelboard environments across the full Motor FLA lineup, while RoHS-compliant and mercury-free construction supports responsible manufacturing.

[{"name": "Product Type", "value": "Circuit Breaker"}, {"name": "Series", "value": "QO"}, {"name": "Voltage Rating", "value": "120/240 VAC"}, {"name": "Amperage Rating", "value": "10A - 150A"}, {"name": "Standards", "value": "CSA"}, {"name": "Listing", "value": "UL Listed"}]

Manufacturer Resources

Product Specs

Product Type:
Circuit Breaker
Series:
QO
Connection Type:
Bolt-On
Voltage Rating:
120/240 VAC
Listing:
UL Listed
Standards:
CSA
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Circuit Breakers

Square D QOB135 – Frequently Asked Questions

1) Will a Square D QOB bolt-on breaker fit my plug-on QO load center?
No. The QOB is a bolt-on breaker, meaning it bolts to the panelboard bus rather than clipping on. Plug-on QO load centers take plug-on QO breakers; QOB breakers belong in panelboards with bolt-on bus prep. Check how the breaker you are pulling out is attached before ordering.
2) Is the QOB breaker rated for an air conditioning or refrigeration circuit?
Yes, the QOB is HACR rated, so it can be used as the branch protection on heating, air conditioning and refrigeration equipment circuits. That is the rating an HVAC contractor needs to see when the condensing unit nameplate calls for an HACR type breaker.
3) What wire size can I land in a Square D QOB breaker?
The QOB terminals accept AWG 8 through AWG 2 conductors, copper or aluminum. If your feeder is larger than 2 AWG or smaller than 8 AWG, this breaker's lugs are not the right termination.
4) How do I tell a 1-pole QOB from a 2-pole or 3-pole by the part number?
Read the digit after QOB. QOB130VH and QOB135 are single pole; QOB210, QOB215, QOB240, QOB250, QOB270, QOB290 and QOB2150VH are two pole; QOB360 is three pole. Single pole breakers are rated 120 V AC, multi-pole 120/240 V AC.
5) What is the closest bolt-on alternative to a Square D QOB breaker from another manufacturer?
The Eaton BAB Series Quicklag thermal-magnetic circuit breaker is the nearest counterpart in construction: it is also a bolt-on, thermal-magnetic miniature breaker, matching the bolt-on connection and thermal-magnetic trip design of the Square D QOB QO breaker. Note that bolt-on breakers mount to a specific panelboard bus pattern, so a QOB and a BAB are not interchangeable in the same panel - confirm the panelboard the breaker is going into before substituting.
6) If a QOB miniature breaker is not large enough for the feeder, what should be used instead?
The Square D QOB QO breaker is a miniature circuit breaker topping out at 150A Motor FLA, as with the QOB2150VH. For larger feeders, step up to a molded case breaker such as the ABB A2A150TT in the A2 Series, a 3-pole molded case circuit breaker. Molded case frames mount differently than a bolt-on miniature breaker and require their own enclosure or panel provision.
7) Can an ABB ST200M miniature breaker be used in place of a Square D QOB?
No. The ABB ST200M Series is a C-curve miniature circuit breaker built to UL1077, which covers supplementary protectors rather than branch-circuit breakers, and it is a DIN-rail style device rather than a bolt-on panelboard breaker. The Square D QOB QO breaker is UL Listed and bolts onto the panelboard bus, so the two are not substitutes for branch-circuit protection in a QO panelboard.
8) What amp ratings does the Square D QOB series come in?
Square D QOB bolt-on breakers are offered at 10A, 15A, 30A, 35A, 40A, 50A, 60A, 70A, 90A and 150A Motor FLA. Every rating keeps the same 22kA interrupting capacity, HACR listing and bolt-on mounting, so you size to the motor load without changing anything else about the breaker's behavior in the panel.
9) Why would I pay for a 22kA QOB instead of a standard QO breaker?
Available fault current. The QOB's 22kA interrupting rating covers services where the calculated short circuit current exceeds what a standard QO breaker is rated to clear. If your coordination study or utility fault data puts the panel above the standard rating, the 22kA device is the one that satisfies the series rating; if you are well under it, the standard QO is adequate.
10) Is the Square D QOB approved for work in Canada?
The QOB is UL Listed and CSA Certified, so it carries approvals for both US and Canadian installations. It is also RoHS compliant and mercury free, which matters on institutional and government specs with materials restrictions.
11) Can I use a QOB breaker in a hot mechanical room or rooftop panel?
The QOB is rated for ambient air operation up to 40 degrees C. Above that the thermal element will trip earlier than its nameplate rating, so panels in attics, rooftop enclosures or boiler rooms running hotter than 40 C need derating consideration rather than a straight swap.
12) What is the difference between a Square D QOB and an Eaton BAB bolt-on breaker?
Both are thermal-magnetic bolt-on breakers, but they are not interchangeable in the panel. The Eaton BAB Quicklag line, including BAB1010 single pole and the BAB three-pole 240V devices, mounts to Eaton bus; the Square D QOB mounts to Square D QO bolt-on bus. Match the breaker brand to the panelboard label, not just the amp rating.
13) Is a miniature circuit breaker like the QOB the same thing as a molded case breaker?
No. The QOB is a miniature circuit breaker for panelboards and load centers, sized to QO bus spacing. Molded case breakers such as the ABB A2A150TT 3-pole or the ABB XT4 and XT5 frames are larger standalone frames used for feeders and equipment mains, mounted in their own enclosure or a frame-specific interior. If your drawing calls out a frame size, you need a molded case device, not a QOB.
14) Will a Bussmann CBC or CBF breaker work on a 120/240V HVAC circuit?
No. The Bussmann CBC Series is a Type I automotive circuit breaker rated 14VDC, and the CBF Series is a Type II automotive breaker - both are vehicle and low-voltage DC devices. For a 120/240 V AC HACR circuit, the Square D QOB QO bolt-on breaker is the correct class of product, rated 120/240 VAC and HACR rated for heating, air conditioning, and refrigeration circuits.
15) What are the differences between an ABB XT4 or XT5 breaker kit and a Square D QOB breaker?
The ABB XT4 Series and XT5 offerings are 3-pole molded case circuit breaker kits - molded case frames supplied as a kit assembly. The Square D QOB QO breaker is a bolt-on miniature circuit breaker in 1, 2, and 3-pole configurations with a Motor FLA range from 10A to 150A and a 22kA interrupt rating, intended to bolt directly to a panelboard bus. The two serve different enclosure and mounting approaches.
16) Can the QOB be used on a DC circuit?
The QOB is a thermal magnetic breaker built for overcurrent protection and switching on both AC and DC systems. Its marked voltage rating is 120 V AC or 120/240 V AC depending on pole count, so apply it within those AC ratings and confirm the DC application against the breaker's DC marking before use.
17) Can the QOB be used as a disconnecting switch, not just overcurrent protection?
Yes. The over-center, trip-free toggle gives quick-make, quick-break switching with positive trip indication, so the handle can be operated as a switch and will show when the breaker has tripped rather than sitting in a false off position. That is useful where maintenance staff switch circuits at the panel.
18) Is an Eaton NZM undervoltage release an alternative to a QOB breaker?
No - it is an accessory, not a breaker. The Eaton 10250T item is a molded case circuit breaker undervoltage release for the NZM Series, a trip accessory fitted to a host breaker. The Square D QOB QO is the breaker itself, a bolt-on thermal magnetic miniature circuit breaker for panelboard branch and motor circuits.
How fast can I get the Square D QOB135 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 QOB135 come with a warranty?
Absolutely. The Square D QOB135 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 QOB135?
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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