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SQUARE D QOB340GFI Miniature Circuit Breaker - QOB Series, Bolt-On Square D Miniature Circuit Breakers
SQUARE DQOB Series, Bolt-On Square D Miniature Circuit Breakers

SQUARE D QOB340GFI Miniature Circuit Breaker

The SQUARE D QOB Series Miniature Circuit Breaker (MPN QOB340GFI) is a 40 A, three-phase, bolt-on breaker rated for 120/208V AC with a maximum AIR rating of 10kA at 208/120V AC. It is designed for use with QO Load…

SKU 3G-OTH-23073

Brand
SQUARE D
Item
QOB340GFI Miniature Circuit Breaker
Part Number
QOB340GFI
Category
QOB Series, Bolt-On Square D Miniature Circuit Breakers
Available to Order
Also known as:QOB340GFISQUARE D
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Technical specs
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Local availability & support

Delivery
Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Compliance & shipping

Hazardous material
Not classified as hazardous
California Prop 65 warning
No warning recorded
Licence required
No licence required
Safety Data Sheet
Not available
Special shipping
Ships under standard freight

Technical Specifications

SQUARE D
Manufacturer Part Number
QOB340GFI
Type
Three Phase, 10kA at 208/120V AC
Length
4.1
AC
120/208V
Amps
40
Depth
2.9
Poles
3
Width
2.3
SQUARE
D
Standards
UL
Mfr. Model
QOB340GFI
Min. Wire Size
12 AWG (Al); 14 AWG
Number of Poles
3
AC Voltage Rating
120/208V
Max. Operating Temp.
104
Min. Operating Temp.
77
QO and QOB Miniature Breakers Catalog
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Technical Documents

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

Product Description

The SQUARE D QOB Series Miniature Circuit Breaker (MPN QOB340GFI) is a 40 A, three-phase, bolt-on breaker rated for 120/208V AC with a maximum AIR rating of 10kA at 208/120V AC. It is designed for use with QO Load Centers and NQ Panelboards.

Frequently Asked Questions

What is the SQUARE D QOB340GFI miniature circuit breaker used for?

The SQUARE D QOB340GFI is a 40 A, three-phase, bolt-on miniature circuit breaker rated for 120/208V AC. It provides overcurrent and ground-fault protection in QO Load Centers and NQ Panelboards, commonly used in commercial and industrial electrical distribution systems.

What are the specifications of the SQUARE D QOB340GFI?

The SQUARE D QOB340GFI is a 40 A, three-phase, bolt-on breaker with an AC voltage rating of 120/208V AC and a maximum AIR rating of 10kA at 208/120V AC. It is designed for use with QO Load Centers and NQ Panelboards. The manufacturer part number is QOB340GFI.

Where to buy the SQUARE D QOB340GFI worldwide?

3G Electric supplies the SQUARE D QOB340GFI miniature circuit breaker worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time on this SQUARE D QOB340GFI breaker.

How to install the SQUARE D QOB340GFI breaker?

Install the SQUARE D QOB340GFI by bolting it into a compatible QO Load Center or NQ Panelboard. Ensure the panel is de-energized, then torque the bolt-on connections per the manufacturer's specifications. Always follow local electrical codes and use appropriate personal protective equipment.

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
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SQUARE D Products

3G Electric supplies SQUARE D qob series, bolt-on 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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Compatible alternatives & equivalents

Cross-referenced by specification & description
Bolt-on miniature circuit breaker rated 50 A at 120/208V AC three-phase. Provides overcurrent protection with a maximum interrupting rating of 10kA at 208/120V AC. Suitable for use in QO Load Centers and NQ Panelboards in commercial and industrial electrical distribution systems
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Bolt-on miniature circuit breaker rated 50 A at 120/208V AC three-phase. Provides overcurrent protection with a maximum interrupting rating of 10kA at 208/120V AC. Suitable for use in QO Load Centers and NQ Panelboards in commercial and industrial electrical distribution systems
Three-pole, 15 A miniature circuit breaker for bolt-on mounting in QO Load Centers and NQ Panelboards. Rated 120/208V AC with a maximum interrupting rating of 10kA at 208/120V AC. Provides overcurrent and short-circuit protection in three-phase electrical distribution systems
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Three-pole, 15 A miniature circuit breaker for bolt-on mounting in QO Load Centers and NQ Panelboards. Rated 120/208V AC with a maximum interrupting rating of 10kA at 208/120V AC. Provides overcurrent and short-circuit protection in three-phase electrical distribution systems
Three-phase bolt-on miniature circuit breaker rated 60 A at 120/240V AC. Provides overcurrent protection with a maximum interrupting rating of 10 kA at 120/240V AC. Suitable for use in Square D NQOD panelboards for commercial and industrial electrical distribution systems
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Three-phase bolt-on miniature circuit breaker rated 60 A at 120/240V AC. Provides overcurrent protection with a maximum interrupting rating of 10 kA at 120/240V AC. Suitable for use in Square D NQOD panelboards for commercial and industrial electrical distribution systems

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The SQUARE D QOB170 is a 70 A, single-pole miniature circuit breaker from the QOB Series, rated for 120/240V AC and 10kA interrupting capacity. Designed for bolt-on installation, it provides overcurrent protection for branch circuits in residential and commercial electrical systems
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The SQUARE D QOB170 is a 70 A, single-pole miniature circuit breaker from the QOB Series, rated for 120/240V AC and 10kA interrupting capacity. Designed for bolt-on installation, it provides overcurrent protection for branch circuits in residential and commercial electrical systems
Three-pole bolt-on miniature circuit breaker rated 30 A at 120/208V AC, three-phase, with a maximum interrupting rating of 10kA at 208/120V AC. Designed for overcurrent protection in QO Load Centers and NQ Panelboards. Suitable for commercial and industrial electrical distribution systems
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Three-pole bolt-on miniature circuit breaker rated 30 A at 120/208V AC, three-phase, with a maximum interrupting rating of 10kA at 208/120V AC. Designed for overcurrent protection in QO Load Centers and NQ Panelboards. Suitable for commercial and industrial electrical distribution systems
Single-pole, bolt-on miniature circuit breaker rated 20 A at 120V AC. Provides overcurrent and ground-fault protection with a maximum interrupting rating of 10kA at 120V AC. For use in QO load centers and NQ panelboards in residential and light commercial electrical distribution systems
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Single-pole, bolt-on miniature circuit breaker rated 20 A at 120V AC. Provides overcurrent and ground-fault protection with a maximum interrupting rating of 10kA at 120V AC. For use in QO load centers and NQ panelboards in residential and light commercial electrical distribution systems
Bolt-on miniature circuit breaker from the QOB Series, rated 25 A at 120V AC, single-phase, with a maximum interrupting rating of 10kA at 120V AC. This 1-pole unit provides overcurrent protection for electrical distribution systems. Designed for use in QO Load Centers and NQ Panelboards
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Bolt-on miniature circuit breaker from the QOB Series, rated 25 A at 120V AC, single-phase, with a maximum interrupting rating of 10kA at 120V AC. This 1-pole unit provides overcurrent protection for electrical distribution systems. Designed for use in QO Load Centers and NQ Panelboards
Bolt-on miniature circuit breaker from the QOB Series, rated 25 A, single-phase, 2-pole, 120/240V AC with a maximum interrupting rating of 10kA at 120/240V AC. Designed for use in QO Load Centers and NQ Panelboards to protect branch circuits in electrical distribution systems
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Bolt-on miniature circuit breaker from the QOB Series, rated 25 A, single-phase, 2-pole, 120/240V AC with a maximum interrupting rating of 10kA at 120/240V AC. Designed for use in QO Load Centers and NQ Panelboards to protect branch circuits in electrical distribution systems
Bolt-on miniature circuit breaker from the QOB Series, rated 20 A, 120/240V AC, single phase, with a maximum interrupting rating of 10kA at 120/240V AC. Two-pole construction provides overcurrent protection in electrical distribution systems. For use with QO Load Centers and NQ Panelboards
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Bolt-on miniature circuit breaker from the QOB Series, rated 20 A, 120/240V AC, single phase, with a maximum interrupting rating of 10kA at 120/240V AC. Two-pole construction provides overcurrent protection in electrical distribution systems. For use with QO Load Centers and NQ Panelboards
Bolt-on miniature circuit breaker from the QOB Series, rated 30 A at 120/240V AC, single phase, with a maximum interrupting rating of 10kA at 120/240V AC. Provides overcurrent and ground-fault protection for QO Load Centers and NQ Panelboards in residential and light commercial electrical distribution systems
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Bolt-on miniature circuit breaker from the QOB Series, rated 30 A at 120/240V AC, single phase, with a maximum interrupting rating of 10kA at 120/240V AC. Provides overcurrent and ground-fault protection for QO Load Centers and NQ Panelboards in residential and light commercial electrical distribution systems
Three-pole, three-phase bolt-on miniature circuit breaker rated 20 A at 120/208V AC. Provides overcurrent protection with a maximum interrupting rating of 10kA at 208/120V AC. Designed for use in QO Load Centers and NQ Panelboards in commercial and industrial electrical distribution systems
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Three-pole, three-phase bolt-on miniature circuit breaker rated 20 A at 120/208V AC. Provides overcurrent protection with a maximum interrupting rating of 10kA at 208/120V AC. Designed for use in QO Load Centers and NQ Panelboards in commercial and industrial electrical distribution systems

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