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

SQUARE D QOB350GFI Miniature Circuit Breaker, 50 A, 3-Pole, 120/208V AC, 10kA - QOB Series, Bolt-On Square D Miniature Circuit Breakers
SQUARE DQOB Series, Bolt-On Square D Miniature Circuit Breakers

SQUARE D QOB350GFI Miniature Circuit Breaker, 50 A, 3-Pole, 120/208V AC, 10kA

The SQUARE D QOB Series Miniature Circuit Breaker (MPN QOB350GFI) is a 50 A, three-phase, bolt-on breaker rated for 120/208V AC with a maximum AIR rating of 10kA at 208/120V AC. Designed for use with QO Load Centers…

SKU 3G-OTH-23185

Brand
SQUARE D
Item
QOB350GFI Miniature Circuit Breaker, 50 A, 3-Pole, 120/208V AC, 10kA
Part Number
QOB350GFI
Category
QOB Series, Bolt-On Square D Miniature Circuit Breakers
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
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

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

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
QOB350GFI
Type
Three Phase, 10kA at 208/120V AC
Length
4.1
AC
120/208V
Amps
50
Depth
2.9
Poles
3
Width
2.3
SQUARE
D
Standards
UL
Mfr. Model
QOB350GFI
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
Alternate Products

Technical Documents

(1)
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 QOB Series Miniature Circuit Breaker (MPN QOB350GFI) is a 50 A, three-phase, bolt-on breaker rated for 120/208V AC with a maximum AIR rating of 10kA at 208/120V AC. Designed for use with QO Load Centers and NQ Panelboards, this 3-pole unit provides overcurrent protection in industrial electrical distribution systems.

Frequently Asked Questions

What is the SQUARE D QOB350GFI miniature circuit breaker used for?

The SQUARE D QOB350GFI provides overcurrent protection in industrial electrical distribution systems. It is designed for use with QO Load Centers and NQ Panelboards, handling 50 A at 120/208V AC three-phase. This bolt-on breaker is common in manufacturing plants, commercial buildings, and facility power panels.

What are the specifications of the SQUARE D QOB350GFI circuit breaker?

The SQUARE D QOB350GFI is a 3-pole, 50 A miniature circuit breaker rated for 120/208V AC three-phase. It has a maximum AIR rating of 10kA at 208/120V AC. This bolt-on unit is part of the QOB Series and is compatible with QO Load Centers and NQ Panelboards.

Where to buy the SQUARE D QOB350GFI circuit breaker worldwide?

3G Electric supplies the SQUARE D QOB350GFI miniature circuit breaker to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery for international orders. Contact us for pricing and lead time on this 50 A, three-phase breaker.

How to install the SQUARE D QOB350GFI bolt-on circuit breaker?

Install the SQUARE D QOB350GFI by ensuring the panel is de-energized, then bolt the breaker securely onto the bus bars of a compatible QO Load Center or NQ Panelboard. Torque terminals to manufacturer specifications for the 50 A, 120/208V AC circuit. Always follow local electrical codes and use proper 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
Not sure this is the right part? Photo-identify it

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.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
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
SQUARE D
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
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
SQUARE D
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
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
SQUARE D
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

More from SQUARE D

View all SQUARE D parts
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
SQUARE D
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 15 A at 120/240V AC, single phase, with a maximum interrupting rating of 22kA at 120/240V AC. Two-pole construction for overcurrent protection in branch circuits. Suitable for use in Square D NQOD panelboards in commercial and industrial electrical distribution systems
SQUARE D
Bolt-on miniature circuit breaker from the QOB Series, rated 15 A at 120/240V AC, single phase, with a maximum interrupting rating of 22kA at 120/240V AC. Two-pole construction for overcurrent protection in branch circuits. Suitable for use in Square D NQOD panelboards in commercial and industrial 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
SQUARE D
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 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
SQUARE D
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
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
SQUARE D
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
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
SQUARE D
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
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
SQUARE D
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 40 A at 120/208V AC, three-phase, with a maximum interrupting rating of 10kA at 208/120V AC. Provides overcurrent and ground-fault protection for use in QO Load Centers and NQ Panelboards in commercial and industrial electrical distribution systems
SQUARE D
Three-pole bolt-on miniature circuit breaker rated 40 A at 120/208V AC, three-phase, with a maximum interrupting rating of 10kA at 208/120V AC. Provides overcurrent and ground-fault protection for use in QO Load Centers and NQ Panelboards in commercial and industrial electrical distribution systems