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Square D QOB250 50A two-pole bolt-on breaker, grey plastic housing with black paddle actuator

SQUARE D

SQUARE D QOB250 50A 2 Pole 120/240V AC Bolt On circuit breaker

SKU CH-TA18-EXG7W

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.

How it compares

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

Price $66.99
Pricier than about 58% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSQUARE D

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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