SQUARE D
SQUARE D QOB325 Miniature Circuit Breaker 25A 3 Pole 120/240V AC
A 25 A three-pole miniature breaker for 120/240 V AC panels with a 10 kA interrupting rating
- 25 A rating protects three-phase circuits up to 240 V AC
- 10 kA interrupting capacity clears faults safely at 120/240 V AC
- Bolt-on mounting fits Square D QO and NQOD panelboards directly
- Pressure-plate terminals accept conductors without special tools
- 48 V DC rating adds flexibility for low-voltage DC applications
Square D QOB325 Three-Pole Breaker
The Square D QOB325 is a bolt-on miniature circuit breaker rated at 25 A for 120/240 V AC three-phase panels. It carries a 10 kA interrupting rating and fits Square D QO load centres and NQOD panelboards. The paddle actuator provides clear on-off indication and the pressure-plate terminals accept standard copper conductors. Operating temperature minimum is 77 °F.
Electricians wiring three-phase branch circuits
This breaker suits electricians protecting 25 A three-phase loads in commercial or light-industrial QO equipment. It is not for single-phase only installations, for DC systems above 48 V, or for panels that require plug-on rather than bolt-on mounting. Buyers needing a different ampere rating, a higher interrupting capacity, or a two-pole device should select another model.
Bolt-on mounting in QO enclosures
The unit bolts directly to the QO bus stack, requiring a compatible panelboard with available three-pole space. Its 3-inch length, 2.25-inch width and 2.91-inch depth fit standard QO interiors without special hardware. Pressure-plate terminals speed conductor landing and free the installer from sourcing separate lug kits. The 100 A frame size ensures mechanical compatibility with other QO branch devices.
Highlights
- 25 A rating protects three-phase circuits up to 240 V AC
- 10 kA interrupting capacity clears faults safely at 120/240 V AC
- Bolt-on mounting fits Square D QO and NQOD panelboards directly
- Pressure-plate terminals accept conductors without special tools
- 48 V DC rating adds flexibility for low-voltage DC applications
Specifications
| Brand | SQUARE D |
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Questions about this item
What panelboard series must I already have for this QOB325 breaker to bolt on?
It is designed for Square D NQOD panelboards and the compatible QO load-center series.
Will this 3-pole 25 A breaker coordinate with existing 100 A frame QO breakers in the same panel?
Yes, it shares the 100 A frame size and 10 kA AIR rating at 120/240 V AC with other QO devices.
How can I verify the breaker is operating correctly after installation?
Confirm the paddle actuator moves firmly to ON, the circuit carries load without nuisance trips, and the panel interior stays at or below 77 °F ambient.
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