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SQUARE D Miniature Circuit Breaker: 90 A, 120/240V AC, Three Phase, 10kA at 120/240V AC - QO Series, Plug-In Square D Miniature Circuit Breakers
SQUARE DQO Series, Plug-In Square D Miniature Circuit Breakers

SQUARE D Miniature Circuit Breaker: 90 A, 120/240V AC, Three Phase, 10kA at 120/240V AC

The SQUARE D QO390 is a 90 A, three-phase miniature circuit breaker from the QO Series, designed for plug-in use with QO Load Centers and NQ Panelboards. It has an AC voltage rating of 120/240V AC and a maximum AIR…

SKU 3G-OTH-22161

Brand
SQUARE D
Item
Miniature Circuit Breaker: 90 A, 120/240V AC, Three Phase, 10kA at 120/240V AC
Category
QO Series, Plug-In Square D Miniature Circuit Breakers
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Technical Specifications

SQUARE D
Manufacturer Part Number
QO390
Type
Three Phase, 10kA at 120/240V AC
AC
120/240V
Amps
90 A
Phase
Three
Poles
3
For Use With
QO Load Centers and NQ Panelboards
Max. AIR Rating
10kA at 120/240V AC
AC Voltage Rating
120/240V AC
View Full Spec Sheet

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SQUARE D Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SQUARE D QO390 is a 90 A, three-phase miniature circuit breaker from the QO Series, designed for plug-in use with QO Load Centers and NQ Panelboards. It has an AC voltage rating of 120/240V AC and a maximum AIR rating of 10kA at 120/240V AC.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the SQUARE D QO390 miniature circuit breaker used for?

The SQUARE D QO390 is a 90 A, three-phase miniature circuit breaker used to protect electrical circuits from overloads and short circuits in QO Load Centers and NQ Panelboards. It is suitable for residential, commercial, and industrial applications requiring 120/240V AC, three-phase power distribution.

What are the specifications of the SQUARE D QO390 circuit breaker?

The SQUARE D QO390 is a 90 A, three-phase, 3-pole miniature circuit breaker with an AC voltage rating of 120/240V AC and a maximum AIR rating of 10kA at 120/240V AC. It is designed for plug-in use with QO Load Centers and NQ Panelboards.

Where to buy the SQUARE D QO390 circuit breaker worldwide?

3G Electric supplies the SQUARE D QO390 miniature circuit breaker to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your location. Contact us for pricing and lead time on this three-phase, 90 A breaker.

How to install the SQUARE D QO390 circuit breaker?

To install the SQUARE D QO390, ensure the panel is de-energized. Align the breaker's plug-in base with the bus bar in a QO Load Center or NQ Panelboard and press firmly until it snaps into place. Verify the breaker is fully seated and the handle operates freely before restoring power.

Used in

Common applications for SQUARE D
Commercial building electrical panels — Square D QO series plug-in circuit breakers for branch circuit protection
Industrial motor control centers — Square D QOB series bolt-on breakers in NQOD panelboards
Heating equipment installations — Square D QOU series unit-mount breakers for overcurrent protection
Outdoor electrical distribution — Square D L-Frame enclosures housing LAL/LHL breakers for 400 A service
Indoor facility power distribution — Square D Q-Frame enclosures with QBL/QDL breakers for 225 A circuits
Retrofit and replacement in existing Square D load centers — QO series breakers for 120/240V AC systems

SQUARE D Products

3G Electric supplies SQUARE D qo series, plug-in square d miniature circuit breakers. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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