SQUARE D
SQUARE D QOB360 60A 3 Pole 120/240V AC circuit breaker
Three-pole 60 A breaker for 120/240 V AC panels, bolt-on mounting for QO load centres, 10 kA interrupting rating
- Three-pole protection for 120/240V AC three-phase loads
- 60 A rating with 10 kA interrupting capacity at 120/240V AC
- Bolt-on mounting fits Square D QO and NQOD panelboards
- Operates down to 77 °F for reliable cold-start performance
- Compact 3.12 × 2.25 × 2.91 in frame saves panel space
QOB360 3-pole miniature breaker
The Square D QOB360 is a bolt-on miniature circuit breaker rated at 60 amps for 120/240 volt AC three-phase panels. It fits Square D QO and NQOD load centres and provides standard branch-circuit protection for commercial and light-industrial installations.
10 kA interrupting rating at 120/240 V AC
The single specification that decides fit is the 10 kA AIR rating at the rated voltage. A panel’s available fault current must not exceed this value, otherwise the breaker cannot safely clear a short circuit and a higher-rated device is required.
Thermal-magnetic trip under sustained overload
Under continuous load the thermal element responds to prolonged overcurrent by bending a bimetal strip, while the magnetic coil acts instantly on high-magnitude faults. The paddle actuator gives a clear visual indication when the breaker has tripped.
Highlights
- Three-pole protection for 120/240V AC three-phase loads
- 60 A rating with 10 kA interrupting capacity at 120/240V AC
- Bolt-on mounting fits Square D QO and NQOD panelboards
- Operates down to 77 °F for reliable cold-start performance
- Compact 3.12 × 2.25 × 2.91 in frame saves panel space
Specifications
| Brand | SQUARE D |
|---|
Questions about this item
How much current does the 60 A rating actually let through in a panel?
The breaker carries up to 60 A continuously and trips on sustained overloads or short circuits, with a 10kA interrupting rating at 120/240V AC.
Does the 120/240V AC rating limit the voltage I can apply to each pole?
Each pole is rated for 120/240V AC and 48V DC, so the device can be used on single-phase 120/240V systems and on 48V DC circuits within its interrupting capacity.
What space and hardware does the bolt-on frame need to mount in a QO load center?
The unit measures 3.12 in long, 2.25 in wide and 2.91 in deep, and bolts directly onto the bus bars of a Square D QO or NQOD panelboard using the integral lug terminals.
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