Schneider Square D MCB – Buy Square D QO & Homeline Circuit Breakers Online

Schneider Square D MCB – Complete Range Overview

When you buy Schneider Square D MCB from ElectriHub, you gain access to the complete North American circuit breaker portfolio from the world's most recognised residential panelboard brand. Square D is Schneider Electric's flagship North American brand — acquired in 1991 and since expanded into a global standard for residential and light commercial electrical protection. The Square D QO series (Quality One) is the premium line, built around the patented Visi-Trip indicator, with standard 10kA and up to 22kA interrupting ratings on selected models, covering single pole, 2-pole, and 3-pole configurations from 15A through 100A alongside GFCI, AFCI, dual-function, and QOT tandem variants. The Square D Homeline series provides the same UL 489 Listed reliability at a more cost-optimised price point, covering single pole and 2-pole configurations from 15A through 100A with GFCI, AFCI, and HOMT tandem variants for Homeline-compatible load centres. All Schneider Square D MCBs supplied by ElectriHub are 100% genuine, UL 489 listed, and available globally with worldwide shipping and full technical support.

Square D QO Series – Deep Dive

The Square D QO circuit breaker (Quality One series) is Schneider's premium North American residential and commercial MCB, with a product lineage dating back to the 1950s and one of the longest service histories of any circuit breaker brand in North America. The key differentiating feature of the QO series is the patented Visi-Trip indicator — a colour-coded trip mechanism that turns the handle red when the breaker has tripped on a fault condition, making it immediately distinguishable from an intentionally OFF breaker even in a fully loaded, poorly lit residential panel. The QO series covers single pole (QO1 series: QO115 through QO1100), 2-pole (QO2 series: QO215 through QO2100), and 3-pole (QO3 series: QO315 through QO3100) configurations, with standard 10kA interrupting rating and up to 22kA on selected higher-rated models. Special-function variants include the QO GFCI breaker (QO115GFIC, QO120GFIC, QO220GFIC), the QO AFCI breaker (QO115PCAFI, QO120PCAFI — plug-on neutral models), the QO dual-function breaker (QO120DFI combining AFCI and GFCI in one), and the QOT tandem breaker (QOT1515, QOT2020) for two circuits in one slot. Retail and contractor convenience packs (QO115CP, QO120CP) package the standard QO single pole breaker in a clamshell blister for shelf and counter display.

Square D Homeline Series – Deep Dive

The Square D Homeline MCB (HOM series) is Schneider's value-optimised residential circuit breaker line, designed for standard residential load centres and volume construction applications where 10kA interrupting rating is sufficient and unit cost is the primary driver. The Homeline series covers single pole (HOM1 series: HOM115, HOM120, HOM130 through HOM1100) and 2-pole (HOM2 series: HOM215, HOM220 through HOM2100) configurations, with the same UL 489 listing and 120/240V AC rating as the QO series but without the Visi-Trip indicator. Special-function variants include the Homeline GFCI breaker (HOM115GFIC, HOM120GFIC, HOM220GFIC), the Homeline AFCI breaker (HOM115AFIC, HOM120AFIC), and the HOMT tandem breaker (HOMT1515, HOMT2020) for two circuits in one slot. Homeline breakers are only compatible with Square D Homeline-series load centres and are not interchangeable with QO-series panels — always confirm your panel series before ordering.

Square D MCB Catalogue Number Explained

Understanding the Square D QO catalogue number structure makes ordering straightforward. For the QO series: QO = Quality One series; the digit following (1, 2, or 3) = number of poles; the remaining two or three digits = ampere rating (15 = 15A, 20 = 20A, 30 = 30A, 100 = 100A — written without the final zero for 100A). So QO115 = 1-pole 15A; QO230 = 2-pole 30A; QO3100 = 3-pole 100A. Suffix codes indicate special functions: GFIC = ground fault circuit interrupter; PCAFI = plug-on neutral arc fault circuit interrupter; DFI = dual function (AFCI+GFCI); CP = clamshell retail convenience pack. For the Homeline series: HOM replaces QO as the prefix, with the same pole-digit and ampere-code structure — HOM115 = 1-pole 15A, HOM220 = 2-pole 20A, and so on.

Square D vs Other MCB Brands – Why Square D?

Square D circuit breakers are the default specification for North American residential and light commercial panelboards for several distinct reasons. The Square D QO series' Visi-Trip indicator is a genuine functional advantage in real-world use — maintenance electricians and homeowners can identify a tripped breaker across a 40-circuit panel without a torch or close inspection. The QO series' published service life of 40+ years and robust internal construction reflect Schneider's investment in the premium residential market. The Homeline series provides a genuine cost-saving alternative without sacrificing the UL 489 listing or core reliability — making it the dominant choice for residential construction volume. Both series benefit from Schneider Electric's global manufacturing standards, quality control, and the Square D brand's over-75-year history in the North American electrical market.

Square D and Schneider Electric – Brand Relationship

Square D is a brand of Schneider Electric, acquired from Square D Company in 1991. Since the acquisition, Square D has remained the flagship North American brand identity for Schneider's residential and commercial circuit protection products in the US and Canadian markets, while Schneider Electric's own brand name is more prominent on industrial control and automation products globally. In practice, when buyers search for Schneider Square D MCB, Square D circuit breaker, Square D QO breaker, or Square D Homeline breaker, they are all searching for the same Schneider Electric product line. ElectriHub stocks and ships these products as Schneider Square D MCBs, with all products bearing authentic Square D labelling and UL markings as shipped from Schneider Electric's manufacturing facilities.

How to Select the Right Square D MCB – Step-by-Step

1. Confirm Your Panel Series: Check whether your load centre or panelboard is a QO-series or Homeline-series Square D panel — QO and Homeline breakers are NOT interchangeable between the two bus types. The panel model number is typically printed on the inside of the panel door or on the interior label.
2. Determine Pole Count: Single pole (1-pole) for 120V branch circuits. 2-pole for 240V circuits (dryers, ranges, HVAC, EV chargers). 3-pole for 3-phase equipment in 208/240V commercial panelboards.
3. Select the Ampere Rating: Match to the circuit conductor ampacity per NEC (or local applicable code). The most common residential ratings are 15A (QO115/HOM115) for general lighting and receptacle circuits and 20A (QO120/HOM120) for kitchen, bathroom, laundry, and outdoor circuits; 30A–50A for 240V appliance circuits; 60A–100A for sub-feeders and sub-panel mains.
4. Standard vs Special Function: Select standard thermal-magnetic (QO or HOM) for the majority of branch circuits. Select QO/HOM GFCI where NEC requires ground fault protection. Select QO/HOM AFCI where NEC requires arc fault protection. Select QO DFI (dual-function) where NEC requires both. Select QOT/HOMT tandem only in CTL-rated panels accepting tandem breakers.
5. QO vs Homeline: Choose QO for commercial panelboards, higher fault current locations, or when the Visi-Trip indicator is required. Choose Homeline for cost-sensitive volume residential construction in Homeline-compatible load centres.
6. Confirm Interrupting Rating: Standard 10kA suits the vast majority of residential and light commercial installations. If the available fault current at the panel exceeds 10kA, confirm whether a higher-rated QO model is required — contact ElectriHub's technical team for guidance.

Why Buy Schneider Square D MCB from ElectriHub?

• ✓ Complete Square D MCB range — QO and Homeline series, single pole, 2-pole, and 3-pole in all standard ampere ratings 15A through 100A — all stocked globally at ElectriHub
• ✓ Special-function variants in stock — QO GFCI, QO AFCI (plug-on neutral), QO dual-function AFCI+GFCI, QOT tandem, Homeline GFCI, Homeline AFCI, and HOMT tandem
• ✓ Retail convenience packs in stock — QO120CP, QO115CP, HOM120CP, HOM115CP — for contractor and retail supply
• ✓ 100% genuine Schneider Square D products — UL 489 listed with full manufacturer warranty on every unit supplied
• ✓ Worldwide shipping with full tracking and export documentation — supporting projects across the USA, Canada, UAE, Caribbean, and all markets specifying Square D panelboards
• ✓ Competitive pricing with volume discounts for electrical contractors, distributors, panel builders, and large project orders
• ✓ Same or next business day dispatch on standard stocked QO and Homeline ampere ratings
• ✓ Technical support — QO vs Homeline panel compatibility, ampere selection, GFCI/AFCI/DFI code compliance guidance, tandem breaker CTL compatibility, and catalogue number verification

Frequently Asked Questions – Schneider Square D MCB

Q: What is a Schneider Square D MCB?

A Schneider Square D MCB is a Miniature Circuit Breaker from Square D — Schneider Electric's flagship North American brand — used in residential and light commercial 120/240V panelboards to protect branch circuits and feeders against overload and short-circuit faults. The two main Square D MCB families are the premium QO series (with Visi-Trip indicator) and the value Homeline series, both UL 489 listed and designed for their respective Square D compatible load centres and panelboards.

Q: What is the difference between Square D QO and Square D Homeline?

The Square D QO is the premium line with Visi-Trip indicator (the handle turns red when tripped), up to 22kA interrupting rating on selected models, and plug-on neutral GFCI/AFCI variants — for QO-compatible panels. The Square D Homeline is the value-optimised line at 10kA standard interrupting rating, without a Visi-Trip indicator — for Homeline-compatible panels. The two series are NOT interchangeable — breakers must match the panel bus type. Both are UL 489 listed and 100% genuine Schneider Square D products.

Q: What does QO120CP mean?

QO120CP is a Square D QO series 1-pole 20A circuit breaker packaged in a clamshell (CP = Clamshell Pack) retail/contractor convenience blister for over-the-counter and shelf display. The breaker itself is identical to a standard QO120 — the CP suffix refers only to the packaging, not any difference in the breaker's ratings, specifications, or UL listing.

Q: Can I use a Square D QO breaker in a Homeline panel?

No — Square D QO breakers are designed for QO-series load centres and panelboards, while Homeline breakers are designed for Homeline-series panels. The two bus types are physically different and not interchangeable. Using a QO breaker in a Homeline panel (or vice versa) is unsafe and not UL Listed. Always confirm your panel series before ordering.

Q: What is a Square D QOT tandem breaker?

A Square D QOT tandem breaker (e.g. QOT1515, QOT2020) accommodates two independent 1-pole branch circuits in the space of a single standard panel slot, allowing additional circuits in a fully loaded panel without adding physical panel spaces. QOT tandem breakers can only be installed in QO-series panels that are rated to accept tandem (CTL) breakers — confirm your panel's CTL rating before ordering.

Q: How do I buy Schneider Square D MCB internationally from ElectriHub?

ElectriHub ships Square D MCBs — QO and Homeline series, single pole, 2-pole, 3-pole, GFCI, AFCI, dual-function, and tandem across all standard ampere ratings — worldwide, with complete export documentation. Contact our team with the full catalogue number (e.g. QO120, QO230, QO120GFIC, QO120PCAFI, HOM120), quantity required, and delivery destination for a fast quotation with confirmed lead time.

Buy Schneider Square D MCB Today

Browse our complete range of Schneider Square D MCBs above — Square D QO single pole (QO115, QO120, QO130 to QO1100), QO 2-pole (QO215 to QO2100), QO 3-pole (QO315 to QO3100), QO GFCI, QO AFCI, QO dual-function, QOT tandem, and the complete Square D Homeline (HOM) series — or contact our technical team for QO vs Homeline panel compatibility, ampere rating confirmation, GFCI/AFCI/dual-function NEC compliance guidance, tandem breaker CTL panel confirmation, and catalogue number verification. ElectriHub ships 100% genuine Schneider Square D circuit breakers worldwide, supporting projects of all scales — from a single replacement breaker to complete panelboard stocking packages for residential development and commercial construction projects. Buy Schneider Square D MCB online with fast dispatch, competitive pricing, and full technical support — only at ElectriHub.