Square D FJA34040 Molded Case Circuit Breaker
- 40A
- 3 Pole
- I-Line
Quantity
Square D FJA34040 - 40A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for robust commercial applications, the Square D FJA34040 is a 3-pole, 40A molded case circuit breaker. It features fixed thermal-magnetic trip units providing long-time and instantaneous (LI) protection for industrial electrical systems. This legacy F-frame breaker mounts into standard Square D I-Line panelboards and switchboards using a plug-on connection. Rated for 65kAIC at 480VAC, it is an exact replacement for older installations and can be substituted with the HJA36040.Specifications
| Brand | Square D |
|---|---|
| Part Number | FJA34040 |
| Series | FJA |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 10kA @ 250VDC |
| Frame Type | FJA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs |
| Standards | UL 489, CSA C22.2 No. 5, NEMA AB 1, IEC 60947-2 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity |
Product FAQs
6 answersWhat panelboards are compatible with the FJA34040 circuit breaker?
This breaker is designed for use in Square D I-Line panelboards and switchboards. It features an I-Line style plug-in connection that mounts directly onto the interior busbar stack.
What does the J in the FJA34040 catalog number indicate?
In the Square D F-frame nomenclature, the J designates the interrupting rating tier. For this breaker, it signifies a high interrupting capacity of 65kA at 480VAC and 100kA at 240VAC.
Is the Square D FJA34040 a current or legacy circuit breaker?
The FJA34040 is part of the legacy Square D F-frame molded case circuit breaker family. While still widely used for maintaining existing I-Line panelboards, it is often replaced by the newer PowerPact H-frame series, such as the HJA36040, in modern installations.
What wire sizes are accepted by the standard lugs on the FJA34040?
The standard lugs on this breaker accept wire sizes ranging from 14 AWG to 1/0 AWG. They are rated for use with either copper or aluminum conductors.
Does the FJA34040 have adjustable trip settings?
No, this breaker features a fixed thermal and fixed magnetic trip unit. It provides standard long-time and instantaneous protection without adjustable dials.
Can the FJA34040 be used in direct current applications?
Yes, this breaker is rated for use in DC systems up to 250VDC, where it provides an interrupting rating of 10kA.
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