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Square D FH26040AB Molded Case Circuit Breaker
- 40A
- 2 Pole
- I-Line
Square D
FH26040AB
Molded Case Circuit Breaker
Brand
Square D
SKU
FH26040AB
Quantity
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Square D FH26040AB - 40A 2 Pole Molded Case Circuit Breaker
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Description
Engineered for industrial applications, the Square D FH26040AB 2-pole, 40A molded case circuit breaker belongs to the legacy F-Frame family. This unit mounts into Square D I-Line panelboards and features a specific AB phase connection. It serves as a drop-in replacement for older systems and is replaced by the HGA260401 in modern setups. Rated for 25kAIC at 480VAC, this high-interrupting breaker includes HACR certification and a visual trip indicator for quick fault identification.Specifications
| Brand | Square D |
|---|---|
| Part Number | FH26040AB |
| Series | FH |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | FH |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards |
| Wire Gauge | 14-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Phase Connection AB |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Visual Trip Indicator, Non-Interchangeable Trip |
Product FAQs
8 answersWhat panelboards are compatible with the FH26040AB circuit breaker?
This breaker is designed exclusively for use in Square D I-Line panelboards and switchboards. It utilizes an I-Line style plug-in connection.
What does the AB suffix indicate on this Square D breaker?
The AB suffix specifies the phase connection. It means this 2-pole breaker is factory configured to connect to the A and B phases on the I-Line bus.
Is the Square D FH26040AB still manufactured, or is there a modern replacement?
The FH series is a legacy F-Frame breaker. For modern panel upgrades, it is typically replaced by the Square D PowerPact H-Frame series, such as the HGA260401, which offers the same I-Line mounting and phase configuration.
What wire sizes are accepted by the lugs on the FH26040AB?
The factory-installed lugs accept wire gauges from 14 AWG up to 1/0 AWG. They are rated for both copper and aluminum conductors.
How does this breaker mount into the panel?
It features an I-Line style plug-in connection, allowing the breaker to snap directly onto the bus assembly of a compatible Square D I-Line panelboard without the need for bolt-on hardware.
What type of trip unit is equipped on the FH26040AB?
It features a fixed thermal magnetic trip unit providing Long-Time and Instantaneous (LI) protection. Both the thermal and magnetic trip points are fixed and non-adjustable.
Can this breaker be used in DC electrical systems?
Yes, in addition to its AC ratings, this breaker is rated for 250VDC with an interrupting capacity of 10kA.
How can I tell if the FH26040AB has tripped?
When the breaker trips due to an overcurrent or short circuit, the operating handle will move to a central position between ON and OFF, providing clear visual confirmation of the fault.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 10 reviews.
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Rating
10 reviews
- DMDonald M.Verified BuyerReviewingSquare D FH36030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Excellent Service
The support team with Super Breakers went over and beyond in ensuring the breakers were on site for an emergency repair…
CAVA Construction Manager very pleased!
Donald Mayo
Mayo Electric
- PHpayton h.Verified BuyerReviewingSquare D FH36090 - 90A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/17/26great
great straightforward company has almost everything you could ever need in stock
- SGShawn G.Verified BuyerReviewingSquare D FH36020 - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/20/26Thanks !
Excellent service & gear per usual !
Thanks !
- EEarnestVerified BuyerReviewingSquare D FH36060 - 60A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/3/25Fast delivery and quality
The breaker was in great condition.
- JPJason P.Verified BuyerReviewingSquare D FH36050 - 50A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/5/25Breakers
Order was placed and they came in on time in good condition