SQUARE D
SQUARE D QOU240 Miniature Circuit Breaker 40A 2 Pole 120/240V AC
A 40 A two-pole miniature breaker rated 120/240 V AC and 48 V DC with a 10 kA interrupting rating for QO load centres
- 40 A rating protects 120/240 V AC circuits
- 2-pole design covers single-phase loads
- 10 kA interrupting capacity clears faults safely
- Slotted box lug accepts line or load either way
- Fits QO panelboards for direct installation
Square D QOU240 40A 2-Pole Breaker
This Square D QOU240 miniature circuit breaker provides 40 A over-current protection on a 120/240 V AC supply. It fits QO-series load centres and mounts on a surface or DIN rail with a reversible slotted box lug for line or load connections.
Suits single-phase panels needing 10 kA interrupting
The breaker suits residential or light-commercial panels where a 40 A two-pole device with a 10 kA AIR rating at 120/240 V AC is specified. It is not for installations that require a higher interrupting rating, a different pole count, or a DC-only rating above 48 V.
40 A continuous capacity with 10 kA fault headroom
The device carries 40 A continuously and clears faults up to 10 kA at 120/240 V AC. It also carries a 48 V DC rating for limited low-voltage use. Headroom ends at the 40 A thermal trip point or the 10 kA interrupting limit.
Highlights
- 40 A rating protects 120/240 V AC circuits
- 2-pole design covers single-phase loads
- 10 kA interrupting capacity clears faults safely
- Slotted box lug accepts line or load either way
- Fits QO panelboards for direct installation
Specifications
| Brand | SQUARE D |
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Questions about this item
What panelboard series must I already have for this QOU-series 40 A breaker to fit?
It is compatible with QO-series panelboards or load centres; the breaker mounts on surface or DIN rail within those enclosures.
Can I install this 2-pole 40 A breaker beside older single-pole breakers in the same QO panel?
Yes, it occupies two adjacent poles in a QO load centre and operates at 120/240 V AC alongside existing single-pole devices.
How do I confirm the breaker is operating correctly after wiring it to my A/C circuit?
Switch the toggle to ON; the handle stays firmly latched and the connected air-conditioning or refrigeration equipment runs without nuisance tripping.
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