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Grey rectangular bolt-on breaker, two paddle actuators, 3.5 by 1.5 by 2.9 inches

SQUARE D

SQUARE D QOB280 80A 2 Pole 120/240V AC circuit breaker

SKU CH-G22A-J298C

An 80 A two-pole breaker for 120/240 V AC panels with a 10 kA interrupt rating and bolt-on mounting

  • 80 A two-pole protection for 120/240 V AC circuits
  • 10 kA interrupting rating handles high fault currents
  • Bolt-on mounting fits Square D QO and NQOD load centres
  • 48 V DC rating adds low-voltage versatility
  • Compact 3.5 × 1.5 × 2.9 in frame saves panel space

Application Fit

The Square D QOB280 is a bolt-on miniature circuit breaker rated at 80 A for single-phase 120/240 V AC panels. It suits electricians and facility managers who need standard over-current protection in Square D NQOD or QO load centres. Buyers needing a plug-on style, a three-pole device, or a higher AIR rating must select a different model.

Sustained Load Behaviour

The breaker carries its full 80 A rating continuously within a minimum operating temperature of 77 °F inside the enclosure. Thermal-magnetic trip characteristics respond to prolonged overloads without nuisance opening during normal motor-start currents. The 10 kA interrupting capacity at 120/240 V AC clears sustained fault currents safely.

Decisive Specification

The bolt-on mounting style and QOB series designation determine compatibility; the breaker only fits Square D NQOD panelboards that accept QO-frame bolt-on devices. Verify the panelboard series before purchase because plug-on QO breakers will not seat in this footprint.

How it compares

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

Price $171.99
Pricier than about 80% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSQUARE D

Questions about this item

How much heat does the 80 A breaker produce when it runs continuously?

The breaker is rated for a minimum operating temperature of 77 °F and carries a 10 kA interrupting rating at 120/240 V AC; no specific heat-dissipation figure is published.

What panelboard must I already have for this bolt-on breaker to fit?

It mounts on Square D NQOD panelboards and is compatible with the QO load-center series.

Will the QOB280 coordinate with older QO breakers already in my panel?

Yes, it shares the QO series frame size of 100 A and the same bolt-on mounting, so it installs alongside existing QO devices.

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