SQUARE D
SQUARE D QO315 15A 3 Pole 120/240V AC Circuit Breaker
A 15 A three-pole miniature breaker rated 120/240 V AC with 10 kA interrupting capacity for QO load centres
- 15 A protection for three-phase loads
- 10 kA interrupting rating handles high fault currents
- 120/240 V AC rating suits standard panelboards
- Plug-in mounting fits QO load centres quickly
- Compact 3 in frame saves panel space
QO315 Three-Pole Breaker for 15 A Circuits
The SQUARE D QO315 is a 15 A miniature circuit breaker built for three-phase 120/240 V AC panels. It carries a 10 kA interrupting rating at that voltage and also handles 48 V DC circuits. The plug-in design fits QO load centres and NQ panelboards with a 100 A frame size. Electricians and panel builders use it to protect lighting, receptacle and small motor branches.
15 A Trip Rating Matches Branch Load
The single figure that decides fit is the 15 A continuous current rating. A breaker must match the wire ampacity and the calculated load of the circuit it protects; a higher or lower rating would violate code and leave the circuit unprotected. Verify the branch conductor size and load calculation before selecting this pole count and amperage.
10 kA Interrupting Capacity Holds Under Fault
Under sustained fault current the breaker is rated to interrupt up to 10 kA at 120/240 V AC without damage. The thermal-magnetic trip unit responds to prolonged overloads and short-circuit peaks, keeping the contacts intact through repeated events. Pressure-plate terminals maintain low resistance during thermal cycling, so the breaker continues to trip at the calibrated 15 A level over its service life.
Highlights
- 15 A protection for three-phase loads
- 10 kA interrupting rating handles high fault currents
- 120/240 V AC rating suits standard panelboards
- Plug-in mounting fits QO load centres quickly
- Compact 3 in frame saves panel space
Specifications
| Brand | SQUARE D |
|---|
Questions about this item
What does the 15 A rating mean when the breaker is installed in a panel?
It will carry up to 15 A continuously and trip on sustained overloads to protect the downstream wiring.
How does the 10 kA AIR rating at 120/240 V AC limit the breaker's use?
It can safely interrupt fault currents up to 10 000 A on a 120/240 V AC system; do not apply it where available fault current exceeds that value.
What panel space and mounting style does this three-pole QO breaker require?
It uses a plug-in mounting style, fits QO load centres and NQ panelboards, and measures 3 in long by 2.3 in wide by 2.9 in deep.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
