Square D FC24040AC Molded Case Circuit Breaker
- 40A
- 2 Pole
- I-Line
Quantity
Square D FC24040AC - 40A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed to protect commercial and industrial electrical systems, the Square D FC24040AC is a 40A, 2-pole molded case circuit breaker. It provides fixed thermal and magnetic trip functions for reliable LI protection. The legacy F-Frame breaker installs into Square D I-Line panelboards, featuring a specific phase A-C connection. For modern panel upgrades, this configuration is replaced by the PowerPacT HJA260402. It is rated for 65 kAIC at 480VAC and is HACR rated for HVAC equipment.Specifications
| Brand | Square D |
|---|---|
| Series | FC |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 10kA @ 250VDC |
| Frame Type | F |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | 14-1/0 AWG (Cu), 12-1/0 AWG (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 |
|---|---|
| Accessories | I-Line Phase Connection A-C |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Extra High Interrupting Capacity, Visual Trip Indicator, 2-Pole in 3-Pole Housing |
Product FAQs
6 answersWhat does the AC suffix indicate on the FC24040AC catalog number?
The AC suffix specifies the phase connection for the I-Line plug-on bus. This 2-pole breaker is factory-configured to connect exclusively to the A and C phases in a Square D I-Line panelboard or switchboard.
Does the mounting position in the I-Line panel dictate the phase connection?
No. In Square D I-Line panelboards, the phase connection is determined by the breaker's specific jaw configuration, not its physical location on the bus. The FC24040AC will always draw from the A and C phases regardless of where it is mounted.
What is the modern replacement for the legacy FC24040AC breaker?
The FC24040AC is a legacy F-frame circuit breaker. For modern panel upgrades, this specific 40A, 2-pole, A-C phase configuration is typically replaced by the PowerPacT H-frame series, specifically catalog number HJA260402.
Is the FC24040AC suitable for heating and cooling applications?
Yes, this breaker is HACR rated, making it fully approved for use with heating, air conditioning, and refrigeration equipment that requires a dedicated circuit breaker.
What temperature rating is required for the conductors used with this breaker?
For 40-amp Square D F-frame breakers, the terminals are designed for use with 75 degree Celsius rated conductors. The factory lugs accept 14 to 1/0 AWG copper or 12 to 1/0 AWG aluminum wire.
Can I install the FC24040AC in a standard Square D NQ or NF load center?
No. This breaker features an I-Line style plug-in connection and is only compatible with Square D I-Line power distribution panelboards and switchboards. It will not fit in NQ, NF, or QO series panels.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
- AMAlan M.ReviewingSquare D FC34050 - 50A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/25/21Breaker Order
All units were as described and sent quickly.
- JLJon L.ReviewingSquare D FC34030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/10/20SQ D Breaker
Needed an older breaker for a last minute job. Super Breakers had it in stock and it was in my hands in 2 days. Saved the day.