Square D QO Series Convertible...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$454.86
Square D QO Series Convertible Main Breaker Load Center, NEMA 1

Square D QO Series Convertible Main Breaker Load Center, NEMA 1

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Model: QO142M200PQ

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

$454.86
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Square D QO Series Convertible Main Breaker Load Center, NEMA 1

The Square D QO Series Load Center is a 1 phase, 42-space, 52-circuit panel built with a 200A convertible main breaker (PoN configuration) for residential and light industrial electrical distribution. Rated 120/240 V AC, this load center accepts QO breakers, ground fault interrupters, arc fault interrupters, and surge arresters, and is housed in a NEMA 1 indoor enclosure of welded sheet steel with a baked enamel Gray finish. Copper busbars and straight-in wiring terminals support clutter-free, code-compliant installations.

Key Features

  • Configuration: 42 spaces, 52 circuits with a 200A convertible main breaker (PoN) for flexible service entrance or main lug applications.
  • Durable Construction: Welded sheet steel enclosure with baked enamel Gray finish for long-term durability.
  • Copper Busbar: Copper busbar construction supports AWG 4...300 kcmil aluminum/copper conductors.
  • Operational Voltage: Rated 120/240 V AC for standard residential and light commercial service.
  • Enclosure Rating: NEMA 1 indoor enclosure suitable for protected interior installations.
  • Straight-In Wiring: Straight-in wiring design saves wire, labor, and time during installation.
  • 50% More Terminations: Additional terminations provide clutter-free wiring versus standard load centers.
  • Operating Range: Rated for ambient air temperatures from -5°C to 40°C.

Certifications & Compliance

  • UL Listed
  • Mercury Free
  • NEMA 1 Indoor Enclosure

Technical Specifications

  • Number Of Spaces: 42
  • Sustainable Packaging: No
  • Mercury Free: Yes
  • Packaging Without Single Use Plastic: No
  • Tier Id: 2
  • ROHS Eur In Scope: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • Number Of Tandem Circuit Breakers: 10
  • With Recycled Cardboard: No
  • WEEE Product Category: 5
  • Range Of Product: QO
  • China ROHS In Scope: No
  • Return Indicator: Y
  • Take Back: No
  • Device Composition: grounding bar (ordered separately)

Typical Applications

  • Residential Electrical Service Panels
  • Light Industrial Power Distribution
  • New Construction Electrical Rough-In
  • Panelboard and Load Center Upgrades
  • Indoor Protected Installations

Why Square D?

Square D QO load centers combine a welded steel enclosure, copper busbar, and UL Listed construction to deliver reliable, code-compliant power distribution. The convertible main breaker design and straight-in wiring terminals give contractors flexible, time-saving installation for both new construction and panel upgrades.

Manufacturer Resources

Product Specs

Product Type:
Load Center
Voltage Rating:
120/240V
Amperage Rating:
200A
Listing:
UL Listed
Series:
QO
Product Finish:
Baked Enamel Gray
Configuration:
NEMA 1 Enclosure
Product Material:
Welded Sheet Steel
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Panelboards & Load Centers
Product Depth:
3.74 in
Product Height:
39.37 in
Product Width:
14.25 in
Country Of Origin:
United States
Phase:
1 Phase

Square D QO142M200PQ – Frequently Asked Questions

1) Can the Square D QO142M200PQ be used as a main lug panel instead of main breaker?
Yes. The QO142M200PQ ships with a 200A convertible main breaker, which means the breaker can be removed so the panel runs as main lugs only. That lets the same box serve either as a service entrance panel or as a downstream subfeed panel off a larger service.
2) How many breakers will a Square D QO 42-space load center actually hold?
42 spaces, and up to 52 circuits because the panel accepts 10 tandem breakers in addition to full-size single-pole QO breakers. If you need all 52 poles you have to plan which positions get tandems.
3) Can I mount this Square D QO load center outside on the meter wall?
No. The enclosure is NEMA 1, which is indoor-only, protected-location rated. For an outdoor or wet location you need a rainproof enclosure such as the Eaton CH 125A main lug loadcenter in NEMA 3R or the ABB PAM ReliaHome in a NEMA 3R aluminum enclosure.
4) Is a ground bar included with the Square D QO142M200PQ?
No, the grounding bar is ordered separately. For a service entrance install where neutral and ground are bonded at the panel, or any subpanel where they must be kept separate, add the ground bar kit to the order so the job is not held up.
5) Does this panel take AFCI and GFCI breakers, or only standard QO breakers?
It accepts the full QO line: standard QO breakers, ground fault interrupters, arc fault interrupters, and surge arresters. Breakers from other families (Eaton BR, Eaton CH) do not fit a QO bus.
6) Is this the right panel for a 200A residential service upgrade, or is a 125A load center enough?
For a full 200A service replacement, the QO142M200PQ is the match: 200A, 1 phase, 120/240V AC with the main breaker in the can. If you are feeding a garage, addition, or small subpanel instead, a 125A main lug unit like the Eaton BRP24L125GW (NEMA 1, aluminum bus) is the lighter option and does not include a main breaker.
7) What is the difference between the Square D QO142M200PQ load center and the Eaton CH 125A main lug loadcenter?
The Square D QO142M200PQ is a 200A, 1 phase, 120/240V load center with a convertible main breaker in a NEMA 1 welded sheet steel enclosure, so it can serve as a service entrance panel or be used in a main lug arrangement. The Eaton CH2L is a 125A main lug only loadcenter with a copper bus in a NEMA 3R enclosure, meaning it has no main breaker of its own and is fed from upstream overcurrent protection, and its NEMA 3R rating suits outdoor or rain-exposed mounting rather than the protected indoor locations the NEMA 1 QO enclosure is built for. Both use copper busbar. Choose by service size and by whether the panel needs a main disconnect in the can.
8) I only need a small subpanel, not a 200A service panel. What is a simpler alternative to the Square D QO convertible main load center?
For a small subpanel fed from an existing service, the Eaton BRP24L125GW is the lighter-duty option: it is a 125A main lug only loadcenter with an aluminum bus in a NEMA 1 enclosure. The Square D QO142M200PQ is sized for the service itself at 200A with 42 spaces and 52 circuits and a convertible main breaker, in a NEMA 1 enclosure 39.37 in high by 14.25 in wide. If the panel is downstream of a main disconnect and the load is modest, the 125A main lug unit covers it; if it is the service entrance panel, the 200A convertible QO is the one that fits that role.
9) The panel is going on an exterior wall. Can I use the Square D QO142M200PQ outdoors, or should I pick something else?
The Square D QO142M200PQ is a NEMA 1 indoor enclosure in welded sheet steel with a baked enamel gray finish, intended for protected interior installations. For a weather-exposed location, look to a rainproof enclosure instead: the ABB PAM ReliaHome load center uses a NEMA 3R aluminum enclosure with a plug-on neutral, and the Eaton CH2L is a 125A main lug loadcenter with a copper bus in a NEMA 3R enclosure. Match the amperage and the main breaker versus main lug arrangement your service requires when you make that swap.
10) Can I put Eaton BR or CH breakers in the Square D QO142M200PQ?
No. The Square D QO142M200PQ is a QO series load center and its interior accepts QO breakers, including QO ground fault and arc fault devices and surge arresters. Eaton's BR series, as used in the BRP24L125GW loadcenter, and Eaton's CH series, as used in the CH2L, are separate breaker families on their own loadcenter interiors and are not interchangeable with QO. Specify the panel brand and series first, then buy breakers in that same family.
11) What size service conductors do the main lugs on this 200A QO panel take?
The main terminals accept AWG 4 through 300 kcmil aluminum or copper conductors, and they are straight-in type, so service entrance cable lands without bending back on itself. Bus is copper.
12) Will a QO load center work on a 3 phase commercial service?
No. The QO142M200PQ is a single phase, 120/240V AC load center. A 3 phase 208Y/120 or 480Y/277 service needs a 3 phase panelboard, not this unit.
13) Is the Square D QO142M200PQ UL Listed for use as service equipment inspection?
The load center is UL Listed, and it is also mercury free. For an inspector, the relevant points are the UL listing, the NEMA 1 indoor enclosure rating, and that it is rated for ambient air from -5 C to 40 C, so an unconditioned garage in a cold climate may fall outside that range.
14) Is an aluminum bus load center equivalent to the Square D QO142M200PQ?
Not on the bus material. The Square D QO142M200PQ is built with a copper busbar and terminals that take AWG 4 to 300 kcmil aluminum or copper conductors. Among the alternatives, the Eaton CH2L also uses a copper bus, while the Eaton BRP24L125GW uses an aluminum bus and the ABB PAM ReliaHome uses an aluminum enclosure with a plug-on neutral design. If a copper bus is called out on the drawing, the aluminum-bus unit will not satisfy that line of the spec.
15) I want a plug-on neutral panel for AFCI and GFCI breakers. How does that compare to the Square D QO142M200PQ?
The ABB PAM ReliaHome load center is specified as a plug-on neutral design in a NEMA 3R aluminum enclosure. The Square D QO142M200PQ is a 200A, 42-space, 52-circuit QO panel in a NEMA 1 steel enclosure that accepts QO arc fault and ground fault breakers along with standard QO breakers and surge arresters, with straight-in wiring terminals and extra terminations for cleaner neutral and ground runs. Decide between them on enclosure rating and breaker family, since the ABB unit is on the ReliaHome platform and the Square D takes QO devices.
16) What is the enclosure on this QO panel made of, and will it hold up in a utility room?
Welded sheet steel with a baked enamel gray finish. That is fine for a dry basement, utility room, or closet. It is not a corrosion-resistant enclosure, so a damp or washdown area calls for a different rating.
17) Where is the Square D QO142M200PQ made, for Buy American documentation?
Country of origin is the United States, which is the detail a government or institutional procurement file usually needs on a panel submittal.
How fast can I get the Square D QO142M200PQ 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 QO142M200PQ come with a warranty?
Absolutely. The Square D QO142M200PQ 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 QO142M200PQ?
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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