Skip to main content

- View New Merch Drops. Redeem with SuperPoints. -

Square D QOB245-1021 2 Pole Circuit Breaker
Free Shipping Over $99

Square D QOB245-1021 QOB2451021 - 45A 2 Pole Miniature Circuit Breaker

  • 45A
  • 2 Pole
  • Bolt-On
Square D QOB245-1021
QOB2451021 - 45A 2 Pole Miniature Circuit Breaker
Brand Square D
SKU QOB245-1021
Select Item Condition
Earn 348 SuperPoints
  • 45A
  • 2 Pole
  • Bolt-On

Quantity

Bulk Pricing
Send your parts list for a volume quote.
Request Pricing
Square D QOB245-1021 2 Pole Circuit Breaker

Square D QOB2451021 - 45A 2 Pole Miniature Circuit Breaker

New

$348.00 No Stock

Quantity

Similar Items

Description SpecificationsProduct FAQs SuperClub Warranties Shipping Reviews 4.9 (212)

Description

Engineered for commercial and industrial applications, the Square D QOB245-1021 is a 2-pole miniature circuit breaker rated for 45 amps. It provides robust thermal-magnetic protection for electrical systems requiring remote tripping capabilities. This unit mounts into Square D NQ and NQOD panelboards, utilizing a secure bolt-on connection to ensure stable performance. Rated for 10 kAIC at 120/240VAC, this breaker features a factory-installed shunt trip and the signature Visi-Trip indicator.

Specifications

Key specifications
Brand Square D
Part Number QOB245-1021
Series QOB
Amperage 45A
Poles 2
Mounting Style Bolt-On
Voltage 120VAC, 120/240VAC, 48VDC
Phase 1
AIC Rating 10kA @ 120VAC, 10kA @ 120/240VAC, 5kA @ 48VDC
Fit and installation
Frame Type QOB
Terminal Type Box Lugs
For Use With NQ Panelboards, NQOD Panelboards
Wire Gauge 8-2 AWG (Al/Cu)
Max Wire 2 AWG
Min Wire 8 AWG
Protection and operation
Trip Technology Thermal Magnetic
Trip Function Code LI
Trip Function Long-Time, Instantaneous
Trip Adjustability Fixed
Standards and features
Available Options Auxiliary Switch, Alarm Switch
Accessories Shunt Trip (Factory Installed), Load Side Lugs Included
Standards CSA C22.2 No. 5, UL 489, HACR
Approval CSA, UL
Temp Rating 40C
Construction Features HACR Rated, Visual Trip Indicator

Product FAQs

5 answers
What does the 1021 suffix indicate on the QOB245-1021 breaker?

The 1021 suffix indicates that this breaker includes a factory-installed 120/240V AC shunt trip. This accessory allows the breaker to be opened remotely using a push-button, switch, or other pilot control device.

Which panelboards are compatible with the QOB245-1021?

This bolt-on circuit breaker is designed specifically for use in Square D NQ and NQOD series panelboards. It cannot be installed in standard QO load centers, which require plug-on style breakers.

How does the bolt-on mounting of the QOB245-1021 differ from standard QO breakers?

Unlike standard QO breakers that snap onto the busbar, the QOB245-1021 physically bolts directly to the panelboard bus. This provides a highly secure, vibration-resistant connection typically required in commercial and industrial applications.

What wire sizes are accepted by the terminals on the QOB245-1021?

The box lugs on this 45A breaker are designed to accept 8 AWG to 2 AWG copper or aluminum conductors. Ensure proper torque specifications are followed during installation.

Does the QOB245-1021 feature a tripped circuit indicator?

Yes, it includes the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent or short circuit, the handle moves to a center position and a bright red flag appears in the window for quick identification.

SuperClub

Join free. Get 500 SuperPoints.

Earn points on eligible purchases and redeem them at checkout.

100 SuperPoints = $1 off.

Join SuperClub free Sign in

Warranties

60-Day Warranty

Your purchase includes 60 days of SuperBreakers warranty coverage.

See coverage details

Get a Quote

Don’t see what you’re looking for?

We source obsolete and hard-to-find parts every day.

Shipping

Free Shipping Policy

Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.

Read our full shipping policy

Same Day Shipping

We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.

Expedited Shipments

Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.

International Shipping

All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.

Reviews

4.9
Rated 4.9 out of 5 stars
Based on 212 reviews
Reviews Summary
Customers say these electrical breakers arrive exactly as ordered and work perfectly for their intended applications. They consistently praise the competitive pricing, which many report is significantly lower than local suppliers. Fast shipping and prompt delivery are frequently highlighted, with many receiving orders within days or even next-day delivery for urgent needs. The breakers arrive well-packaged and in excellent condition. Many reviews emphasize the company's extensive inventory availability, particularly for hard-to-find breakers. One customer experienced difficulty with order cancellation and was charged a restocking fee, which caused dissatisfaction.
Search
Search Reviews
Rating
Ratings
Write a Review (Opens in a new tab)
212 reviews
  • SJ
    Sheldon J. H.
    Verified Buyer
    Reviewing
    Square D QOB240 - 40A 2 Pole Miniature Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    10/12/26
    Installer

    Good price, worked great.

    Was this helpful?
  • ML
    Mike L.
    Verified Buyer
    Reviewing
    Square D QOB250 - 50A 2 Pole Miniature Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    10/9/26
    breaker orders

    Breaker worked out great

    Can not be happier with the quick shipping

    Was this helpful?
  • RC
    Richard C.
    Verified Buyer
    Reviewing
    Square D QOB380 - 80A 3 Pole Miniature Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    10/7/26
    Great price quick turn around

    Thank you for getting me the breaker in a timely fashion

    Was this helpful?
  • DS
    Darren S.
    Verified Buyer
    Reviewing
    Square D QOB250 - 50A 2 Pole Miniature Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    10/5/26
    Airport taxi lighting

    After contactor replacement we discovered bad breakers and were able to get replacements from Super Breakers in 2 days. THANK YOU SUPER BREAKERS..

    Was this helpful?
  • MR
    Miguel R.
    Verified Buyer
    Reviewing
    Square D QOB220GFI - 20A GFCI Miniature Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    10/1/26
    Excellent

    Excellent product and service

    Was this helpful?