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Square D QOB235-1021 2 Pole Circuit Breaker
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Square D QOB235-1021 QOB2351021 - 35A 2 Pole Miniature Circuit Breaker

  • 35A
  • 2 Pole
  • Bolt-On
Square D QOB235-1021
QOB2351021 - 35A 2 Pole Miniature Circuit Breaker
Brand Square D
SKU QOB235-1021
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  • 35A
  • 2 Pole
  • Bolt-On

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Square D QOB235-1021 2 Pole Circuit Breaker

Square D QOB2351021 - 35A 2 Pole Miniature Circuit Breaker

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$249.00 No Stock

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Description SpecificationsProduct FAQs SuperClub Warranties Shipping Reviews 4.9 (212)

Description

Providing advanced control, the Square D QOB235-1021 is a 2-pole, 35A miniature circuit breaker. It integrates a 120-240VAC shunt trip mechanism, enabling remote tripping capabilities for specialized commercial safety systems. Designed with a bolt-on mounting configuration, this breaker installs into Square D NQ and NQOD panelboards. Its box lug terminals are rated to accept 8-2 AWG copper or aluminum wiring. The breaker delivers a 10 kAIC interrupting rating and features a Visi-Trip flag.

Specifications

Key specifications
Brand Square D
Part Number QOB235-1021
Series QOB
Amperage 35A
Poles 2
Mounting Style Bolt-On
Voltage 120/240VAC
Phase 1
AIC Rating 10kA @ 120/240VAC
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, Padlock Attachment
Accessories Shunt Trip
Standards CSA C22.2 No. 5, HACR, UL 489
Approval CSA, UL
Temp Rating 40C
Construction Features HACR Rated, Visual Trip Indicator

Product FAQs

7 answers
What panelboards are compatible with the QOB235-1021 circuit breaker?

This bolt-on breaker is designed specifically for use in Square D NQ and NQOD series panelboards. It will not fit in standard QO residential load centers, which require plug-on breakers.

What does the 1021 suffix indicate on the QOB235-1021 catalog number?

The 1021 suffix designates that the breaker includes a factory-installed 120/240V AC shunt trip accessory. This allows the breaker to be tripped remotely by an external voltage signal, which is commonly required for emergency stops or fire alarm system integration.

What is the plug-on equivalent of the QOB235-1021?

If you need this exact 35A breaker with a 120/240V AC shunt trip for a standard QO load center, the plug-on equivalent is catalog number QO2351021.

How does the QOB235-1021 mount into the panelboard?

It features a bolt-on connection, meaning it secures directly to the panelboard bus bar with screws. This provides a highly secure connection that prevents the breaker from vibrating loose in commercial and industrial environments.

What wire sizes are accepted by the terminals on this breaker?

The box lugs on this 35A breaker accept 8 AWG to 2 AWG wire. The terminals are rated for both copper (Cu) and aluminum (Al) conductors, providing flexibility for field wiring.

Can the QOB235-1021 be used in DC applications?

Yes, in addition to its standard AC ratings, this breaker is rated for 48V DC systems. When used in DC applications, it has a maximum interrupting capacity of 5kA.

How does the thermal-magnetic trip mechanism operate on this breaker?

The breaker uses a fixed LI (long-time and instantaneous) trip unit. The thermal component provides long-time protection against sustained overloads, while the magnetic component provides instantaneous tripping during short-circuit events.

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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.

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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.
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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?