QO Single Pole Miniature Tandem Circuit Breaker (120/240V, 20A)

Square D QO Single Pole Tandem Circuit Breaker, 20 Amp (Model QO2020)

The Square D QO2020 is a single pole miniature tandem circuit breaker rated for 20 amps at 120/240V, designed to protect two separate 1-pole circuits while occupying just one space in your QO load center. This plug-in breaker delivers overload and short-circuit protection with a 10 kA interrupt rating at 120/240V AC 50/60 Hz, meeting UL and CSA certification standards. Built by Schneider Electric for residential and light commercial applications, it allows electricians to maximize panel capacity without upgrading to a larger enclosure. The HACR rating confirms compatibility with heating, air conditioning, and refrigeration equipment. This tandem design solves the common problem of running out of panel space when you need to add circuits.

Key Features & Benefits

• Tandem Single Pole Design: Houses two independent 20-amp, 1-pole circuits in a single breaker space, allowing you to double your circuit capacity in panels where space is limited without replacing the entire load center.
• Plug-In Mounting: Installs directly onto the panel bus bar without bolts or screws, cutting installation time and making future service or replacement faster than bolt-on designs.
• 10 kA Interrupt Rating: Provides protection against short-circuits up to 10,000 amps at 120/240V AC 50/60 Hz, safeguarding both your wiring and connected equipment from electrical faults.
• Box Lug Electrical Connection: Accepts AWG 14 through AWG 8 copper or aluminum wire in box-style terminals, giving you flexibility in wire sizing for different circuit loads.
• UL Listed and CSA Certified: Meets North American safety and performance standards, ensuring code compliance and reliable operation in residential and commercial installations.
• HACR Rated: Approved for use with heating, air conditioning, and refrigeration equipment, making it suitable for protecting HVAC circuits that require specialized breaker ratings.
• 104°F Operating Temperature: Designed to function reliably at ambient temperatures up to 104°F (40°C), maintaining protection even in hot attic or utility room installations.

Compatibility & Requirements

This tandem breaker is compatible only with Square D QO load centers that are specifically designed to accept tandem breakers. Not all QO panel spaces permit tandem installations, so verify your panel documentation or labeling before purchase. The breaker requires a QO series panel with plug-in bus bar configuration. It accepts AWG 14 to AWG 8 copper or aluminum conductors in its box lug terminals.

Installation & Care

The QO2020 uses a plug-in mounting system that connects directly to the panel bus bar. Install by aligning the breaker with the panel slot and pressing firmly until it seats onto the bus connection. Wire connections are made via box lugs that accommodate AWG 14 through AWG 8 wire. This breaker operates in ambient temperatures up to 104°F (40°C). No ongoing maintenance is required under normal operating conditions.

Frequently Asked Questions

Q: Does Square D make a tandem breaker? A: Yes, Square D manufactures tandem breakers for both their QO and Homeline panel series. The QO2020 is a single pole tandem breaker in the QO line, rated for 20 amps and designed to fit one space in compatible QO load centers. This plug-in breaker provides two independent 1-pole circuits in a single breaker position, allowing you to add circuits without upgrading your panel.

Q: What is a tandem 20 amp breaker used for? A: A tandem 20 amp breaker provides overcurrent protection for two separate 20-amp, 120V circuits while occupying just one space in your electrical panel. Common applications include adding circuits for outlets, lighting, or small appliances when your panel is full. Each pole operates independently and can protect different circuits, such as a bedroom outlet circuit and a bathroom lighting circuit, both at 20 amps.

Q: Will this tandem breaker fit all Square D QO panels? A: No, the QO2020 tandem breaker only fits QO load centers that are specifically designed and labeled to accept tandem breakers. Some QO panel spaces do not permit tandem installations due to panel design or local code restrictions. Check your panel's labeling or documentation to confirm which spaces allow tandem breakers before purchasing or installing.

Q: What is the interrupt rating of the QO2020? A: The QO2020 has a 10 kA (10,000 amp) interrupt rating at 120/240V AC 50/60 Hz. This means the breaker can safely interrupt short-circuit currents up to 10,000 amps without failure, providing protection for your wiring and connected equipment. The breaker is UL listed and CSA certified to meet North American safety standards.

Q: What wire sizes does this breaker accept? A: The QO2020 accepts AWG 14 through AWG 8 copper or aluminum wire in its box lug terminals. This range covers the standard wire sizes used for 20-amp circuits, with AWG 12 being the most common for residential 20-amp applications. The box lug design provides secure connections for both copper and aluminum conductors.

Q: Can I use this breaker for HVAC equipment? A: Yes, the QO2020 is HACR rated, which means it is approved for use with heating, air conditioning, and refrigeration equipment. HACR-rated breakers meet specific requirements for protecting motor loads and HVAC systems. However, verify that your specific HVAC equipment requires 20-amp, single-pole protection, as many units need different configurations.

Q: What is the difference between plug-in and bolt-on breakers? A: The QO2020 uses plug-in mounting, which means it connects directly to the panel bus bar by pressing into position without requiring mounting bolts. Plug-in breakers install faster and are easier to remove for service compared to bolt-on designs that require screws. Square D QO panels use the plug-in mounting system exclusively.

Q: What voltage is the QO2020 rated for? A: The QO2020 is rated for 120/240V operation. Each of the two poles provides 20-amp protection at 120V for standard branch circuits. The 120/240V rating indicates the breaker can be used in panels with either voltage configuration, though each individual pole protects a 120V circuit.

Q: What certifications does this breaker carry? A: The QO2020 is UL listed and CSA certified, meeting the safety and performance standards required for electrical equipment in the United States and Canada. These certifications ensure the breaker has been independently tested and complies with the National Electrical Code (NEC) and Canadian Electrical Code (CEC) requirements for circuit protection devices.

Q: What temperature can this breaker operate in? A: The QO2020 is designed to operate at ambient air temperatures up to 104°F (40°C). This operating temperature range covers typical residential and commercial installation environments, including attics, basements, garages, and utility rooms. Operating the breaker above this temperature may affect its performance and trip characteristics.