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Square D QO330 three-pole miniature circuit breaker, grey plastic housing with toggle switches

SQUARE D

SQUARE D QO330 Miniature Circuit Breaker, 30A 3 Pole 120/240V AC

SKU CH-9120-380R8

Three-pole thermal-magnetic breaker rated 30 A at 120/240 V AC with 10 kA interrupting capacity and VisiTrip indication

  • 10 kA interrupting capacity protects equipment
  • VisiTrip indicator shows tripped status at a glance
  • 30 A three-pole rating suits 120/240 V AC loads
  • UL Listed and CSA Certified for code compliance
  • Plug-in mounting speeds up panel installation

QO330 30 A Three-Pole Breaker

The SQUARE D QO330 is a miniature thermal-magnetic circuit breaker rated at 30 A and 120/240 V AC. It provides overcurrent protection and switching for residential and light commercial panels. The unit features a trip-free toggle mechanism with quick-make, quick-break action and positive handle indication. VisiTrip indication shows at a glance when the breaker has tripped.

Installers needing 10 kA plug-in protection

Electricians fitting QO load centres will find the plug-in mounting and 10 kA interrupting rating match standard panel requirements. The three-pole design suits 120/240 V circuits such as sub-panels or heavy-duty appliance feeds. Builders who need DIN-rail mounting, higher interrupting ratings or DC ratings beyond the listed specification should look at alternative ranges. Projects requiring factory-fitted shunt trips or alarm switches must verify accessory compatibility separately.

10 kA interrupting rating at 120/240 V AC

The single figure that decides suitability is the 10 kA breaking capacity at the rated voltage. If the available fault current at the installation point exceeds this value, the breaker cannot be used safely. Confirm the prospective short-circuit current before specifying the QO330.

How it compares

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

Price $83.99
Pricier than about 64% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSQUARE D

Questions about this item

How can I confirm the QO330 breaker has tripped after installation?

The VisiTrip indicator provides a visual signal that the breaker has tripped and interrupted the circuit.

What accessories are included with the QO330 and what must be purchased separately?

The breaker itself is supplied; shunt trips, auxiliary switches and alarm switches are factory-installed accessories available separately.

Which QO series breaker should I choose for a 30 A three-pole 120/240 V AC circuit?

The QO330 is rated 30 A, three pole, 120/240 V AC with 10 kA breaking capacity and plug-in mounting.

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