SQUARE D
SQUARE D QOB125 25A 1 Pole 120/240V AC Bolt On Circuit Breaker
A 25 A, single-pole bolt-on breaker rated 120/240 V AC with a 10 kA interrupting rating for QO load centres
- 25 A standard protection for single-phase circuits
- 10 kA interrupting rating handles high fault currents
- Bolt-on mounting fits Square D QO load centers directly
- Pressure-plate terminals accept wire without ring lugs
- Operates down to 77 °F for cold-environment reliability
Square D QOB 25A Bolt-On Breaker
The Square D QOB125 is a single-pole miniature circuit breaker rated at 25 amps for 120/240V AC and 48V DC systems. It uses a bolt-on mounting style designed specifically for Square D QO and NQOD panelboards. The paddle actuator provides clear on/off indication for residential or light-commercial circuit protection.
Sustained Load Behaviour
The breaker carries its 25A rating continuously within a minimum operating temperature of 77°F inside the enclosure. A 10kA interrupting rating at 120/240V AC ensures safe fault clearance during extended overloads or short circuits. Pressure-plate terminals maintain secure conductor contact without loosening under thermal cycling.
Upgrade Context
This unit replaces a worn or tripped QO-series single-pole breaker in the same 100A frame size. The jump is warranted when a circuit requires dedicated 25A protection rather than a different amperage. It is not suited for panels outside the QO/NQOD series or for multi-pole applications.
Highlights
- 25 A standard protection for single-phase circuits
- 10 kA interrupting rating handles high fault currents
- Bolt-on mounting fits Square D QO load centers directly
- Pressure-plate terminals accept wire without ring lugs
- Operates down to 77 °F for cold-environment reliability
Specifications
| Brand | SQUARE D |
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Questions about this item
How much heat does the QOB125 generate when it carries a continuous 25 A load all day?
The breaker is rated for a minimum operating temperature of 77 °F and a frame size of 100 A, so normal temperature rise at 25 A stays within those limits.
Which panelboard must I already own for this bolt-on breaker to fit?
It is designed for Square D NQOD panelboards and the QO load-center series.
Will this single-pole QOB125 share a bus with my existing two-pole QO breakers?
Yes, it mounts on the same QO-series bus and uses the same pressure-plate terminals as other QO breakers.
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