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Square D QOB125 bolt-on circuit breaker, single paddle, grey plastic body

SQUARE D

SQUARE D QOB125 25A 1 Pole 120/240V AC Bolt On Circuit Breaker

SKU CH-RXS2-7S73K

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.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $29.99
Cheaper than about 70% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSQUARE D

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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