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Square D QO I-Line Panelboard Distribution Panel
The Square D QO I-Line panelboard distribution panel is engineered for AC and DC power distribution in commercial and industrial electrical systems. This configuration provides 6 spaces, a 30A rated current, 3-pole construction, and a 25kA short circuit current rating at 240 V AC, making it a dependable accessory for I-Line panelboard installations. Built to mount in all I-Line panelboards and compatible with QO load centers, it accepts AWG 14...AWG 10 copper or aluminum conductors for flexible branch circuit wiring.
Key Features
- Space Configuration: 6 spaces for organized branch breaker mounting within I-Line panelboards.
- Current Rating: 30A line rated current for reliable branch circuit distribution.
- Pole Configuration: 3-pole design supports multi-phase branch circuit applications.
- Short Circuit Current: 25kA rating for robust fault protection performance.
- Operational Voltage: Rated for 240 V AC (Ue) systems, single phase, ABC phase connection.
- Wire Compatibility: Accepts AWG 14...AWG 10 copper or aluminum conductors.
- Panelboard Compatibility: Mounts in all I-Line panelboards and is compatible with QO load centers.
- Operating Temperature: Rated for ambient air temperatures from -5 °C to 40 °C.
Certifications & Compliance
- Complies with UL 489 listed, CSA, and IEC standards
- RoHS EUR Compliant with Exemptions
- Mercury Free construction
- REACH Free of SVHC
Technical Specifications
- Warranty: 18 months
- Take Back: No
- Warranty Period: 18 months
- Returnability: Yes
- Product Contributes To Saved And Avoided Emissions: No
- Number Of Spaces: 6
- Sustainable Packaging: No
- Mercury Free: Yes
- Packaging Without Single Use Plastic: Yes
- Reach Free Shvc: Yes
- ROHS Eur In Scope: Yes
- Recycled Metal Content At Cr Level: 0 %
- Legacy WEEE Scope: In
- Packaging Made With Recycled Cardboard: No
- Phase Connection: ABC
- With Recycled Cardboard: No
- Range Of Product: QO
- Without Single Use Plastic: Yes
- Complies with UL 489 listed, CSA, and IEC standards
- ROHS Eur Status: Compliant with Exemptions
- ROHS Exemption Information: Yes
- Reach Free Of Svhc: Yes
- Consumer packaging
Typical Applications
- Commercial and Industrial Electrical Distribution Systems
- I-Line Panelboard Installations
- Branch Circuit Breaker Mounting
- QO Load Center Retrofits and Upgrades
- 1 or 3 Phase AC/DC Power Distribution
Why Square D?
Square D QO components are built for code-compliant performance in demanding commercial and industrial environments, backed by UL 489, CSA, and IEC compliance. With mercury-free construction and compatibility across the QO and I-Line panelboard families, this distribution panel delivers the reliability electrical professionals expect from Square D.
Manufacturer Resources
Product Specs
- Product Type:
- Distribution Panel
- Series:
- QO
- Voltage Rating:
- 240V AC
- Amperage Rating:
- 30A
- Configuration:
- 3-Pole
- Listing:
- UL Listed
- Standards:
- UL 489
- Country of Origin:
- United States
- Department:
- Electrical
- Product Group:
- Power Distribution
- Product Subgroup:
- Panelboards & Load Centers
Square D HQO306 – Frequently Asked Questions
1) Will the Square D HQO306 mount in my I-Line panelboard?
Yes. The HQO306 QO branch mounting assembly is built to mount in all I-Line panelboards, and it also works with QO load centers. That is the point of the part: it gives you 6 spaces for QO branch breakers inside an I-Line enclosure.
2) What wire sizes will the QO HQO306 terminals accept?
Terminations take AWG 14 through AWG 10 conductors, and either copper or aluminum is accepted. If your branch circuits run heavier than #10, this is not the assembly for them.
3) What is the interrupting rating on the Square D HQO306 at 240 volts?
25kA short circuit current rating at 240 V AC. Check that against the available fault current at your panel location, because the assembly can't be applied on a system with more available fault current than that.
4) Does the Square D QO HQO306 meet UL 489 for a commercial panelboard job?
It is UL Listed and complies with UL 489, plus CSA and IEC standards. For a spec that calls for UL 489 listed panelboard components, that requirement is met on the face of the product data.
5) Is the HQO306 a 3-phase device, and how are the phases landed?
It's a 3-pole configuration with ABC phase connection, rated 240 V AC, and it can be applied on 1 or 3 phase AC or DC distribution. The 3-pole build is what lets it feed multi-phase branch circuits off an I-Line bus.
6) What amperage is the Square D HQO306 rated for?
30A line rated current. It is sized for branch circuit distribution at that level, so the QO breakers you land on it have to stay within the 30A line rating rather than being treated as a main-size feeder tap.
7) Can the HQO306 be installed in an unconditioned mechanical room or outdoor enclosure?
Ambient air rating runs from -5 C to 40 C. A heated indoor electrical room or a conditioned space is fine; a location that drops below -5 C or runs hotter than 40 C is outside the rating and you should look at a different assembly or condition the space.
8) What is the exact part number to order this 6-space QO I-Line assembly?
Square D part number HQO306, from the QO range. That single model is the whole offering here: 6 spaces, 30A, 3-pole, 25kA at 240 V AC. If you need a different space count or pole configuration, you're looking at a different HQO number.
9) Is the Square D HQO306 RoHS and REACH compliant for a government or institutional submittal?
For submittal purposes: RoHS EUR compliant with exemptions, REACH free of SVHC, mercury free construction, and it ships in packaging without single use plastic. Country of origin is the United States, which matters if your project carries domestic sourcing language.
How fast can I get the Square D HQO306 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 HQO306 come with a warranty?
Absolutely. The Square D HQO306 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 HQO306?
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installation tips, and troubleshooting. Contact Us
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