Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
SQUARE D Miniature Circuit Breaker: 45 A, 120/240V AC, Three Phase, 10kA at 120/240V AC - QOU Series, Unit-Mount Square D Miniature Circuit Breakers
SQUARE DQOU Series, Unit-Mount Square D Miniature Circuit Breakers

SQUARE D Miniature Circuit Breaker: 45 A, 120/240V AC, Three Phase, 10kA at 120/240V AC

The SQUARE D QOU345 is a 45 A, three-phase miniature circuit breaker from the QOU Series, designed for unit-mount applications. It is rated for 120/240V AC with a maximum AIR rating of 10kA at 120/240V AC. This…

SKU 3G-OTH-23358

Brand
SQUARE D
Item
Miniature Circuit Breaker: 45 A, 120/240V AC, Three Phase, 10kA at 120/240V AC
Category
QOU Series, Unit-Mount Square D Miniature Circuit Breakers
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

SQUARE D
Manufacturer Part Number
QOU345
Type
Three Phase, 10kA at 120/240V AC
AC
120/240V
Amps
45 A
Phase
Three
Poles
3
For Use With
Air Conditioning and Refrigeration Equipment
Max. AIR Rating
10kA at 120/240V AC
AC Voltage Rating
120/240V AC
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

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

Product Description

The SQUARE D QOU345 is a 45 A, three-phase miniature circuit breaker from the QOU Series, designed for unit-mount applications. It is rated for 120/240V AC with a maximum AIR rating of 10kA at 120/240V AC. This breaker is intended for use with air conditioning and refrigeration equipment.

Frequently Asked Questions

What is the SQUARE D QOU345 miniature circuit breaker used for?

The SQUARE D QOU345 is a 45 A, three-phase miniature circuit breaker designed for unit-mount applications in air conditioning and refrigeration equipment. It protects circuits from overloads and short circuits at 120/240V AC with a 10kA interrupting rating.

What are the specifications of the SQUARE D QOU345?

The SQUARE D QOU345 is a 45 A, three-pole miniature circuit breaker rated for 120/240V AC. It has a maximum AIR rating of 10kA at 120/240V AC and is part of the QOU Series. It is intended for use with air conditioning and refrigeration equipment.

Where to buy the SQUARE D QOU345 worldwide?

3G Electric supplies the SQUARE D QOU345 miniature circuit breaker worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us to source this breaker for your air conditioning or refrigeration application.

How to select the SQUARE D QOU345 for an application?

Select the SQUARE D QOU345 when you need a 45 A, three-phase miniature circuit breaker for air conditioning or refrigeration equipment. Verify your system voltage is 120/240V AC and that the available fault current does not exceed 10kA. Ensure the breaker is compatible with your panel's unit-mount configuration.

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 qou series, unit-mount square d miniature circuit breakers. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
SQUARE D Miniature Circuit Breaker: 35 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU335). Key specifications — Phase: Three; Amps: 35 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 35 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU335). Key specifications — Phase: Three; Amps: 35 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 100 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU3100). Key specifications — Phase: Three; Amps: 100 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 100 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU3100). Key specifications — Phase: Three; Amps: 100 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 30 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU330). Key specifications — Phase: Three; Amps: 30 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 30 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU330). Key specifications — Phase: Three; Amps: 30 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 40 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU340). Key specifications — Phase: Three; Amps: 40 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 40 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU340). Key specifications — Phase: Three; Amps: 40 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 30 A, 120/240V AC, Single Phase, 10kA at 120/240V AC, 2 Poles (MPN QOU230). Key specifications — Phase: Single; Amps: 30 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 30 A, 120/240V AC, Single Phase, 10kA at 120/240V AC, 2 Poles (MPN QOU230). Key specifications — Phase: Single; Amps: 30 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 45 A, 120/240V AC, Single Phase, 10kA at 120/240V AC, 2 Poles (MPN QOU245). Key specifications — Phase: Single; Amps: 45 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 45 A, 120/240V AC, Single Phase, 10kA at 120/240V AC, 2 Poles (MPN QOU245). Key specifications — Phase: Single; Amps: 45 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.

More from SQUARE D

View all SQUARE D parts →
SQUARE D Miniature Circuit Breaker: 100 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU31001021). Key specifications — Phase: Three; Amps: 100 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 100 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU31001021). Key specifications — Phase: Three; Amps: 100 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 50 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU350). Key specifications — Phase: Three; Amps: 50 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 50 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU350). Key specifications — Phase: Three; Amps: 50 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 30 A, 120/240V AC, Single Phase, 22kA at 120/240V AC, 2 Poles (MPN QOU230VH). Key specifications — Phase: Single; Amps: 30 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 22kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 30 A, 120/240V AC, Single Phase, 22kA at 120/240V AC, 2 Poles (MPN QOU230VH). Key specifications — Phase: Single; Amps: 30 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 22kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 60 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU360). Key specifications — Phase: Three; Amps: 60 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 60 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU360). Key specifications — Phase: Three; Amps: 60 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 60 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU3601021). Key specifications — Phase: Three; Amps: 60 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 60 A, 120/240V AC, Three Phase, 10kA at 120/240V AC, 3 Poles (MPN QOU3601021). Key specifications — Phase: Three; Amps: 60 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 60 A, 120/240V AC, Single Phase, 10kA at 120/240V AC, 2 Poles (MPN QOU2601021). Key specifications — Phase: Single; Amps: 60 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 60 A, 120/240V AC, Single Phase, 10kA at 120/240V AC, 2 Poles (MPN QOU2601021). Key specifications — Phase: Single; Amps: 60 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 20 A, 120/240V AC, Single Phase, 10kA at 120/240V AC, 1 Poles (MPN QOU120). Key specifications — Phase: Single; Amps: 20 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 20 A, 120/240V AC, Single Phase, 10kA at 120/240V AC, 1 Poles (MPN QOU120). Key specifications — Phase: Single; Amps: 20 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Heating; Brand: SQUARE D.
SQUARE D Miniature Circuit Breaker: 50 A, 120/240V AC, Single Phase, 10kA at 120/240V AC, 1 Poles (MPN QOU150). Key specifications — Phase: Single; Amps: 50 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.
SQUARE D
SQUARE D Miniature Circuit Breaker: 50 A, 120/240V AC, Single Phase, 10kA at 120/240V AC, 1 Poles (MPN QOU150). Key specifications — Phase: Single; Amps: 50 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Air Conditioning and Refrigeration Equipment; Brand: SQUARE D.