SQUARE D
SQUARE D QOB250 50A 2 Pole 120/240V AC Bolt On circuit breaker
A 50 A, two-pole bolt-on breaker rated 120/240 V AC with a 10 kA interrupting capacity for QO load centres
- 50 A bolt-on breaker protects 120/240 V circuits
- 10 kA interrupting rating clears faults safely
- Two-pole design serves single-phase panelboards
- QO-series compatibility fits Square D NQOD load centres
- Compact 3.1 × 1.5 × 2.9 in frame installs easily
Circuit Breaker for QO Panels
The Square D QOB250 is a 50 A two-pole bolt-on miniature circuit breaker rated for 120/240 V AC single-phase systems. It fits Square D QO and NQOD panelboards and carries a 10 kA interrupting rating at the rated voltage.
Bolt-On Mounting and Lug Terminals
The bolt-on mounting style secures the breaker directly to the panel bus for a firm mechanical connection. A standard lug terminal accepts wire connections without special tools and the paddle actuator provides clear on, off and trip positions.
Thermal-Magnetic Protection at 77 °F
Thermal-magnetic operation trips on sustained overloads and instantaneous short circuits within the 10 kA rating. The unit is calibrated for a minimum operating temperature of 77 °F and the compact frame measures 3.1 in long, 1.5 in wide and 2.9 in deep for standard panel spacing.
Highlights
- 50 A bolt-on breaker protects 120/240 V circuits
- 10 kA interrupting rating clears faults safely
- Two-pole design serves single-phase panelboards
- QO-series compatibility fits Square D NQOD load centres
- Compact 3.1 × 1.5 × 2.9 in frame installs easily
Specifications
| Brand | SQUARE D |
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Questions about this item
What interrupting rating does the QOB250 provide at 120/240V AC?
The QOB250 delivers a maximum AIR rating of 10 kA at 120/240V AC.
What panelboard space and mounting style does this breaker require?
It uses a bolt-on mounting style and fits Square D QO and NQOD panelboards with a 100A frame size.
How is the QOB250 installed, and what step is often missed?
Align the breaker with the panel bus, press firmly until the bolt-on clips engage, then secure the mounting screw; skipping the screw leaves the breaker loose.
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