Square D FJA140401 Molded Case Circuit Breaker
- 40A
- 1 Pole
- I-Line
Quantity
Square D FJA140401 - 40A 1 Pole Molded Case Circuit Breaker
New
Quantity
Description
Utilizing proven thermal-magnetic trip technology, this 40A circuit breaker delivers essential long-time and instantaneous protection. The unit is specifically configured for Phase A connections in commercial systems. Installation is streamlined for Square D I-Line panelboards. For future upgrades, this legacy component is replaced by the HJA260401, occupying two pole spaces. Equipped with a 65kA interrupting capacity at 277VAC, it safely clears severe faults and is fully HACR rated.Specifications
| Brand | Square D |
|---|---|
| Part Number | FJA140401 |
| Series | FJA |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 277VAC, 125VDC |
| Phase | 1 |
| AIC Rating | 65kA @ 240VAC, 65kA @ 277VAC, 10kA @ 125VDC |
| 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, Padlock Attachment |
|---|---|
| Accessories | Phase A Connection (Factory Configured) |
| 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
7 answersWhich panelboards are compatible with the FJA140401 circuit breaker?
This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It utilizes the I-Line plug-in mounting system to connect directly to the busbar stack.
Is this 1-pole breaker suitable for use on a 480V system?
Yes, it is rated for 277VAC, which allows it to serve 277V single-phase loads on a 480Y/277V solidly grounded wye system. It provides a 65kA interrupting rating at 277VAC.
What are the acceptable wire sizes for the terminals on this breaker?
The standard mechanical lugs accept wire gauges from 14 AWG up to 1/0 AWG. The terminals are rated for both copper and aluminum conductors.
Can the FJA140401 be utilized in DC circuits?
Yes, this thermal magnetic breaker is rated for DC applications up to 125VDC, where it provides a 10kA interrupting capacity.
What is the modern replacement for the legacy FJA I-Line breaker series?
The legacy F-frame breakers have largely been superseded by the Square D PowerPact H-frame series. However, this FJA breaker remains a direct drop-in replacement for existing I-Line installations without requiring busbar modifications.
How is the FJA140401 secured inside the panelboard?
The line side features plug-in jaws that snap onto the I-Line bus. The load side is then secured to the panelboard mounting pan using a captive retaining screw to ensure a rigid connection.
Does this breaker feature adjustable trip settings?
No, the FJA140401 has fixed thermal and fixed magnetic trip elements. It provides standard long-time and instantaneous protection without adjustable dials.
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