Square D QO 3-Pole Bolt-On Min...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$607.71
Square D QO 3-Pole Bolt-On Mini Circuit Breaker, 25A, 120/240VAC, 65kA

Square D QO 3-Pole Bolt-On Mini Circuit Breaker, 25A, 120/240VAC, 65kA

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Model: QHB325

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

$607.71
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Square D QO 3-Pole Bolt-On Mini Circuit Breaker, 25A, 120/240VAC, 65kA

The Square D QO 25A, 3 pole, bolt-on mini circuit breaker delivers thermal magnetic overcurrent protection and switching for ac and dc systems rated 120/240VAC, with a 65kA interrupt rating for demanding commercial and industrial panelboard applications. Built with an over-center, trip-free toggle mechanism, this QO Series breaker provides quick-make, quick-break switching action and positive contact indication. It is UL Listed and CSA certified, and accepts AWG 14...AWG 8 copper or aluminum conductors, making it a dependable choice for professional electricians upgrading or servicing QO panelboards.

Key Features

  • 3 Pole Configuration: Requires 3 panel spaces for balanced multi-phase circuit protection.
  • Bolt-On Mounting: Secure bolt-on connection for panelboards requiring a fixed, vibration-resistant fit.
  • Voltage Rating: Rated 120/240VAC (also suitable for 120VAC and 240VAC systems) for versatile residential and commercial service.
  • 25A Rating: Provides reliable overcurrent protection sized for 25A branch circuits.
  • 65kA Interrupt Rating: High interrupt capacity supports demanding fault-current environments.
  • Trip-Free Toggle Mechanism: Over-center, quick-make/quick-break action with positive trip indication for safe, reliable operation.
  • Wire Range: Accepts AWG 14...AWG 8 copper or aluminum conductors for flexible field wiring.
  • QO Series: Part of the Square D QO range of thermal magnetic breakers, designed for consistent fit and function across the QO panelboard lineup.

Certifications & Compliance

  • UL Listed
  • CSA Certified

Technical Specifications

  • Toxic Heavy Metal Free: Yes
  • Warranty: 18 months
  • Warranty Period: 18 months
  • Sustainable Packaging: No
  • Mercury Free: Yes
  • Number Of Spaces Required: 3
  • Packaging Without Single Use Plastic: Yes
  • ROHS Eur In Scope: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • Poles Description: 3P
  • Range Of Product: QO
  • Country of Origin: Mexico

Typical Applications

  • Commercial and Industrial Panelboard Wiring
  • Residential and Commercial 120/240VAC Circuit Protection
  • Branch Circuit Overcurrent Protection
  • QO Panelboard Upgrades and Replacements
  • New Construction and Renovation Electrical Work

Why Square D?

Square D QO circuit breakers are engineered with a trip-free, quick-make/quick-break toggle mechanism and are UL Listed and CSA certified for dependable, code-compliant circuit protection. With a 65kA interrupt rating and durable bolt-on construction, this QO Series breaker is built for reliable, long-term performance in professional electrical installations.

Manufacturer Resources

Product Specs

Product Type:
Circuit Breaker
Voltage Rating:
120/240VAC
Amperage Rating:
25A
Configuration:
3-Pole
Connection Type:
Bolt-On
Listing:
UL Listed
Standards:
CSA
Series:
QO
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Circuit Breakers
Product Height:
2.99 in
Product Depth:
2.91 in
Product Width:
2.24 in

Square D QHB325 – Frequently Asked Questions

1) Will a Square D QHB325 bolt-on breaker fit a plug-on QO load center?
No. The QHB325 is a bolt-on breaker, so it mounts with screws to the bus of a QO bolt-on panelboard, not to the plug-on bus found in standard QO load centers. If the existing panel takes plug-in QO breakers, a bolt-on will not seat on the bus. Confirm the panel interior is bolt-on QO before ordering this 25A 3-pole.
2) How many panel spaces does a Square D QO 3-pole 25A breaker take up?
Three. The QHB325 is a 3-pole device and occupies three QO spaces in the panelboard, protecting all three phases with a common trip. If you only have two adjacent open spaces left, this one won't go in.
3) What wire size can I land on the Square D QHB325 25A breaker?
Lugs accept AWG 14 through AWG 8, copper or aluminum. For a 25A circuit that covers the usual #10 copper run, and leaves room to go up to #8 if you are derating for ambient temperature or a long pull.
4) Can this QO breaker be used on a 240V three-phase panel?
The QHB325 is rated 120/240VAC and works on 120VAC or 240VAC systems. A 3-pole breaker in a 120/240V panel is used for three-phase or multi-wire applications at that voltage. It is not rated for 277/480V gear, so for a 480Y panel you need a different device entirely.
5) What is the closest cross-brand equivalent to the Square D QHB325 3-pole bolt-on breaker?
The nearest comparable is the Eaton BAB-302, a Quicklag three-pole thermal-magnetic circuit breaker rated 240V. The QHB325 is a 3-pole bolt-on breaker rated 120/240VAC with a 25A rating, so both are three-pole thermal-magnetic devices for panelboard branch circuits. The difference that decides the order is the panel: the QHB325 is built for Square D QO panelboards, while the BAB-302 is an Eaton Quicklag breaker for Eaton loadcenters and panelboards. Breakers are only listed for the panel they are classified in, so match the breaker to the brand of the enclosure.
6) I need a bolt-on thermal-magnetic breaker but my panel is Eaton, not Square D. What do I use?
Use the Eaton BAB1010, a BAB Series Quicklag thermal-magnetic breaker with a bolt-on connection, in Eaton panelboards. The Square D QHB325 is also a bolt-on thermal-magnetic breaker, but it is a QO Series device sized at 25A in a 3-pole configuration for QO panelboards. If you need three poles in an Eaton panel, the BAB-302 is the three-pole Quicklag option.
7) What is the difference between the QHB325 and an ABB ST200M miniature breaker?
The ABB ST200M is a C-curve miniature circuit breaker built to UL1077, which is the standard for supplementary protectors - devices used downstream of a branch-circuit protective device, typically on DIN rail inside equipment. The Square D QHB325 is UL Listed as a branch-circuit breaker and bolts into a QO panelboard at 120/240VAC. If the drawing calls for branch-circuit overcurrent protection in a panelboard, a UL1077 supplementary protector is not an exchange for it.
8) Does a 65kA interrupting rating matter for my service, or is it overkill?
The 65kA interrupt rating on this QO 3-pole is about available fault current at the panel, not the load. On a small residential service you will never approach it, but on a commercial or industrial board fed by a large transformer the AIC rating has to equal or exceed the calculated fault current at that point. 65kA covers most commercial panelboard locations without needing a series-rated combination.
9) What is the alternative if my panel is an Eaton rather than a Square D QO?
QO breakers only go in QO gear. For an Eaton bolt-on panelboard, the equivalent thermal-magnetic bolt-on family is the Eaton BAB Quicklag, including the three-pole 240V BAB-302. Bus geometry is brand specific, so do not try to cross a QO into an Eaton interior.
10) Is a QO mini breaker like this the same thing as a molded case breaker?
No. The QHB325 is a QO Series mini breaker for branch circuit protection in a panelboard, thermal magnetic, fixed 25A. A molded case breaker such as the ABB A2A150TT in the A2 Series or the XT5 is a larger frame device used for feeders and main protection, often with adjustable or interchangeable trip. If you are protecting a branch circuit off a QO board, the mini is the right class of device.
11) Will the QHB325 trip on all three poles if only one phase faults?
Yes. It uses an over-center, trip-free toggle with common trip across the three poles, so an overload or fault on one phase opens all three. The quick-make, quick-break action also means the handle cannot be held closed against a fault, and the toggle position gives positive contact indication.
12) Can I use a molded case breaker like the ABB A2A150TT in place of the QO QHB325?
No. The ABB A2A150TT is an A2N Series 3-pole molded case circuit breaker, a frame-style device that mounts in or feeds switchboard and MCCB enclosures rather than plugging into a residential-style panelboard. The Square D QHB325 is a 3-pole bolt-on mini breaker rated 25A at 120/240VAC that bolts into a QO panelboard interior and occupies three panel spaces. They serve different points in the distribution system: molded case units are typically used as mains or large feeders, the QHB325 as a branch-circuit device.
13) Will a Bussmann CBC or CBF breaker work as a substitute for the Square D QHB325?
No. The Bussmann CBC Series is a Type I automotive circuit breaker rated 14VDC, and the CBF Series is a Type II automotive breaker; the CBS Series is likewise an automotive family. Those are low-voltage vehicle and equipment devices. The Square D QHB325 is a 3-pole bolt-on panelboard breaker rated 120/240VAC and UL Listed for building branch circuits. The two are not interchangeable in any installation.
14) My spec calls for an adjustable or field-settable trip rating on a 3-pole breaker. Is the QHB325 the right choice?
No. The Square D QHB325 is a fixed thermal-magnetic breaker at a 25A rating with no rating plug. For a field-adjustable rating, the Eaton 6602C72G67 is a Series C K-Frame 400A 3-pole breaker with an interchangeable rating plug. That is a much larger frame intended for feeder and mining duty rather than a QO panelboard branch circuit, so confirm the enclosure and the load before switching.
15) I need the breaker to trip from a remote signal on loss of voltage. Does the QO QHB325 do that?
No. The Square D QHB325 is a straight thermal-magnetic overcurrent device with an over-center trip-free toggle; it has no shunt or undervoltage accessory. For that function, the Eaton 10250T-GR is an NZM Series molded case circuit breaker undervoltage release, an accessory that trips its host breaker when voltage drops. It is an NZM-frame accessory, so it does not mount to a QO panelboard breaker.
16) What are the physical dimensions of this QO bolt-on 3-pole breaker?
It measures 2.99 x 2.91 x 2.24 inches (height, depth, width). That matters when you are checking gutter space and cover clearance in a tight panelboard retrofit.
17) What model number do I order for the Square D QO 25A 3-pole bolt-on?
Order Square D QHB325. That is the QO Series 25A, 3-pole, bolt-on mini breaker rated 120/240VAC with a 65kA interrupting rating, made in Mexico.
18) Do any of the comparable 3-pole breakers come as a kit rather than a standalone breaker?
Yes. The ABB MBB33 is an XT4 Series 3-pole molded case circuit breaker kit and the ABB MBM334 is an XT5 3-pole circuit breaker kit. Kits bundle mounting or accessory components with the breaker, which changes what arrives in the box. The Square D QHB325 is a single bolt-on mini breaker, ordered as model QHB325, that bolts directly into a QO panelboard interior.
How fast can I get the Square D QHB325 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 QHB325 come with a warranty?
Absolutely. The Square D QHB325 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 QHB325?
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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