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White Square D QOU120 miniature circuit breaker single pole 20A 120/240V AC

SQUARE D

SQUARE D QOU120 Circuit Breaker 20A 1 Pole 120/240V AC

SKU CH-EY2S-ZQYXE

Protects residential and commercial circuits with 20A single-pole overcurrent switching at 120/240V AC, verified to UL and CSA datasheet specifications

  • 20 A rating protects circuits from overload
  • Single-pole design fits standard panel slots
  • 120/240 V AC compatibility suits residential and commercial systems
  • UL and CSA verified for reliable overcurrent protection
  • Internally magnetic trip mechanism enables manual circuit opening

QOU Miniature Circuit Breaker 20A 1 Pole

The SQUARE D QOU120 is a miniature molded case circuit breaker rated at 20 amperes and one pole for 120/240V AC systems. It provides overcurrent protection and manual switching in residential and commercial electrical panels. UL and CSA verification confirms adherence to published datasheet specifications. A range of compatible accessories extends mounting versatility.

Replaces legacy 20A single-pole breakers

This breaker serves as a direct replacement for worn or obsolete 20A single-pole devices in existing QO load centres. The jump is worthwhile when a panel requires modern UL and CSA verified protection or when accessories such as shunt trips or auxiliary contacts are needed. It is not for buyers who require multi-pole or higher amperage protection in a single device.

Sustained thermal-magnetic response

Under continuous load the thermal element reacts to prolonged overcurrent while the magnetic strip operates instantly on short-circuit faults. The internally mounted magnetic strips enable manual circuit opening without external tools. Performance remains consistent across AC and DC applications within the rated voltage range.

Highlights

  • 20 A rating protects circuits from overload
  • Single-pole design fits standard panel slots
  • 120/240 V AC compatibility suits residential and commercial systems
  • UL and CSA verified for reliable overcurrent protection
  • Internally magnetic trip mechanism enables manual circuit opening

Specifications

BrandSQUARE D

Questions about this item

Does the 20 A single-pole QOU120 fit a standard QO load-centre slot?

Yes, the QOU120 is built for QO-series load centres and occupies one standard pole position.

What is the common wiring mistake when installing this breaker?

Connecting the load conductor to the line terminal instead of the load terminal, which leaves the circuit unprotected.

When should the QOU120 be replaced?

Replace it if it trips repeatedly without an overload, feels hot to the touch, or shows visible damage after a fault.

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