Square D FGA34040 Molded Case Circuit Breaker
- 40A
- 3 Pole
- I-Line
Square D
FGA34040
Molded Case Circuit Breaker
Brand
Square D
SKU
FGA34040
Quantity
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Square D FGA34040 - 40A 3 Pole Molded Case Circuit Breaker
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Description
Built for commercial and industrial power distribution, the FGA34040 is a 3-pole, 40A molded case circuit breaker. It utilizes thermal-magnetic trip technology to deliver fixed long-time and instantaneous (LI) protection. This breaker mounts into Square D I-Line panelboards. For replacements, note that the newer HGA36040 substitute requires 4.5 inches of mounting space, whereas this original F-Frame model only needs 3 inches. With an interrupting rating of 35kA at 480Y/277VAC, it is HACR rated.Specifications
| Brand | Square D |
|---|---|
| Series | FGA |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480Y/277VAC |
| 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 |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | 40C |
Product FAQs
7 answersWhat panelboards are compatible with the Square D FGA34040?
The FGA34040 is designed specifically for Square D I-Line panelboards and switchboards. Its plug-on phase connections clamp directly onto the I-Line bus stack, making it incompatible with standard bolt-on or load center panels.
How does the I-Line plug-in connection on the FGA34040 operate during a fault?
The I-Line plug-on jaws feature a blow-on joint design. During a high-current short circuit, the magnetic forces generated by the fault current force the jaws tighter against the bus bars, ensuring a secure connection when it is needed most.
What does the 35kAIC rating at 480V mean for system coordination?
The 35kAIC rating indicates the maximum fault current the FGA34040 can safely interrupt at 480V AC without sustaining damage. When installing this breaker in an existing I-Line panel, ensure the available fault current at the panel does not exceed 35kA to maintain proper system safety.
What wire sizes and materials are supported by the FGA34040 load lugs?
The load-side lugs accept 14 AWG to 1/0 AWG conductors and are rated for both copper (Cu) and aluminum (Al) wire. Always torque the lugs to the manufacturer specifications printed on the breaker faceplate to ensure a secure connection and prevent thermal issues.
Is the FGA34040 part of the modern PowerPact series?
No, the FGA34040 is a legacy Square D F-Frame molded case circuit breaker. It is typically used as an exact replacement for aging F-Frame I-Line breakers in existing panels, avoiding the need to retrofit the space for newer PowerPact H-Frame breakers.
What safety precautions are required when installing the FGA34040 in an I-Line panel?
Always de-energize the panelboard before installation if possible. If installing while energized, follow all NFPA 70E guidelines for arc flash PPE. Ensure the breaker is in the OFF or TRIPPED position before engaging the I-Line jaws onto the bus bars.
Can the trip settings on the FGA34040 be adjusted in the field?
No, the FGA34040 features a fixed thermal-magnetic trip unit. Both the long-time overload and instantaneous short-circuit trip thresholds are factory-set and cannot be adjusted by the user.
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