Square D QO120EM 20A 1-Pole 240 V Circuit Breaker

Square D QO120EM 20A 1-Pole 240 V Circuit Breaker is a compact, reliable protection device engineered for residential panels that accept the QO series. With part number QO120EM, this breaker delivers precise overload protection for a single 240-volt circuit, helping keep wiring and connected equipment safe from faults and short circuits.

Designed specifically for the Square D QO family, the QO120EM combines straightforward installation with dependable performance. Its 20-amp rating makes it ideal for circuits that require solid, consistent protection without sacrificing usability in standard home electrical setups.

• Model/Part Number: QO120EM
• Current rating: 20 A
• Poles: 1
• Voltage rating: 240 V
• Series: Square D QO

Key benefits and practical value

Why choose a 1-pole 240V breaker like the QO120EM? It’s purpose-built for protecting a dedicated 240-volt circuit in compatible panels, offering reliable interruption when overloads occur and helping prevent damage to wiring and connected appliances. The QO design is known for consistent trip characteristics and straightforward replacement, making it a practical choice for both professional electricians and diligent homeowners maintaining their own panels.

Ideal use cases

• Replacement for a faulty 240V, 1-pole circuit breaker in compatible Square D panels
• Protection for specific 240V loads within a residential electrical system that uses QO-type breakers
• Stock item for service professionals performing panel maintenance or upgrades

Installation and safety tips

• Always shut off main power before handling or replacing breakers.
• Verify that your panel accepts QO-style breakers and that the 1-pole, 240V configuration matches the circuit you’re protecting.
• Seat the breaker firmly in the bus bar and secure per the panel manufacturer’s instructions. Follow all applicable electrical codes and safety guidelines.

With the Square D QO120EM, you gain a reliable, purpose-built solution for protecting 240-volt circuits in a compatible panel. It’s a practical, ready-to-use component for maintaining safe, efficient residential electrical systems.