SQUARE D
SQUARE D QOU250 Miniature Circuit Breaker 50A 2 Pole 120/240V AC
Provides 50 A overcurrent protection for 120/240 V AC circuits in residential and commercial panels
- 50 A rating protects circuits from overload
- 2-pole design switches both lines in 120/240 V AC systems
- UL and CSA verification confirms datasheet compliance
- QO series fits a wide range of mounting accessories
- Miniature moulded case suits residential and commercial panels
QOU250 50 A two-pole breaker
The SQUARE D QOU250 is a miniature moulded-case circuit breaker rated at 50 amperes and two poles for 120/240 V AC systems. It provides overcurrent protection and manual switching in residential and commercial panels. UL and CSA verification confirms compliance with published datasheet specifications. The QO series design allows versatile mounting options with a range of compatible accessories.
Panel integration and space saved
The breaker fits standard QO load-centres and occupies two pole positions, freeing adjacent slots for additional circuits. It protects both AC and DC branch circuits without requiring separate devices. Internal magnetic trip elements open the circuit automatically under fault conditions. Accessory compatibility simplifies future upgrades or auxiliary contact additions.
Sustained-load behaviour
Under continuous operation the thermal-magnetic mechanism maintains calibration at the 50 A rating without nuisance tripping. Magnetic strips respond instantly to short-circuit currents while the thermal element handles prolonged overloads. UL and CSA testing validates performance across the full temperature range. The breaker resets manually after a trip, restoring protection without component replacement.
Highlights
- 50 A rating protects circuits from overload
- 2-pole design switches both lines in 120/240 V AC systems
- UL and CSA verification confirms datasheet compliance
- QO series fits a wide range of mounting accessories
- Miniature moulded case suits residential and commercial panels
Specifications
| Brand | SQUARE D |
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Questions about this item
How long can the 50 A rating hold before the magnetic trip operates under sustained load?
The breaker uses internal magnetic strips that open the circuit automatically when overcurrent is detected, providing the primary limit during continuous operation.
What heat or noise should I expect when this 2-pole breaker runs all day at 120/240 V AC?
Normal operation produces minimal audible noise and the moulded case dissipates heat within UL and CSA verified limits for residential and commercial panels.
Which panel or mounting system must I already have for this QO series breaker to install correctly?
It is designed for QO compatible load centres and DIN rail accessories that accept the QOU frame size and two-pole footprint.
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