SQUARE D
SQUARE D QOB115 Miniature Circuit Breaker 15A 1 Pole 120/240V AC
Protects single-phase circuits at 15 A with a 10 kA interrupting rating in a bolt-on QO frame
- 15 A single-pole protection for residential panels
- Bolt-on mounting fits Square D QO load centres
- 10 kA interrupting rating handles fault currents
- 120/240 V AC and 48 V DC dual voltage rating
- Compact 3 × .8 × 2.9 in frame saves panel space
QOB115 bolt-on breaker for QO panelboards
The SQUARE D QOB115 is a single-pole miniature circuit breaker rated at 15 A for 120/240 V AC and 48 V DC systems. It uses a bolt-on mounting style that secures directly to compatible QO-series panelboards and NQOD load centers. A paddle actuator provides clear on-off indication for residential and light-commercial branch circuits.
Replaces worn QO 15 A single-pole units
This breaker serves as a direct replacement for failed or aged 15 A QO bolt-on breakers in existing panels. The 10 kA interrupting rating at 120/240 V AC matches the original specification, so the upgrade is warranted when the old device trips nuisance-free but shows heat damage or will not reset. No panel modification is required because the frame size and terminal layout are identical.
Fits 100 A QO frames with pressure-plate terminals
The unit occupies one pole space in a 100 A QO frame and connects via pressure-plate terminals that accept standard copper conductors. Its 3 in length, 0.8 in width and 2.9 in depth leave adjacent pole positions accessible for future expansion. Operating temperature minimum is 77 °F, so the breaker is suited for indoor installations that stay above that threshold.
Highlights
- 15 A single-pole protection for residential panels
- Bolt-on mounting fits Square D QO load centres
- 10 kA interrupting rating handles fault currents
- 120/240 V AC and 48 V DC dual voltage rating
- Compact 3 × .8 × 2.9 in frame saves panel space
Specifications
| Brand | SQUARE D |
|---|
Questions about this item
What panelboard series and mounting style does the QOB115 bolt-on breaker require?
It fits Square D NQOD and QO load centres that accept bolt-on mounting in a single-pole space.
How do you install the QOB115 and what common step is missed?
Align the bolt-on foot with the panel rail, tighten the mounting screw to the specified torque, then press the pressure-plate terminals onto the conductors.
When should the QOB115 be replaced and what indicates end of life?
Replace it if the paddle actuator fails to trip at 15 A, shows visible contact damage, or exceeds the 10 kA interrupting rating during a fault event.
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