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Square D FJA34020 Molded Case Circuit Breaker
- 20A
- 3 Pole
- I-Line
Square D
FJA34020
Molded Case Circuit Breaker
Brand
Square D
SKU
FJA34020
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Square D FJA34020 - 20A 3 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty commercial applications, this 20-amp F-frame breaker delivers essential long-time and instantaneous overcurrent protection. The device mounts into Square D I-Line panelboards, utilizing a specialized plug-on line connection for rapid deployment. While currently replaced by the PowerPact HJA36020, this specific model maintains compatibility with legacy infrastructure. Featuring a high interrupting capacity of 65kA at 480VAC, it safely clears severe electrical faults.Specifications
| Brand | Square D |
|---|---|
| Part Number | FJA34020-R |
| Series | FJA |
| Amperage | 20A |
| 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 |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | 14-4 AWG (Cu/Al) |
| Max Wire | 4 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 | Load Side Lugs Included |
| 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 answersWhat type of panelboards will accept the FJA34020 circuit breaker?
This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It utilizes the I-Line plug-on mounting system for the phase connections and cannot be used in standard unit-mount or load center applications.
How does the I-Line mounting system work on this breaker?
The breaker snaps directly onto the panelboard bus stack using a blow-on joint design. This specialized plug-on line connection uses magnetic forces to tighten the jaws under short circuit conditions, ensuring a secure connection and rapid deployment.
What does the J in the FJA34020 catalog number indicate?
The J designates the interrupting rating tier within the Square D F-frame family. It indicates a high interrupting capacity, specifically rated to safely clear faults up to 100 kA at 240 VAC and 65 kA at 480 VAC.
What wire sizes are compatible with the lugs on this breaker?
The factory-installed lugs accept wire sizes ranging from 14 AWG to 4 AWG. They are dual-rated for use with either copper or aluminum conductors.
What is the modern replacement for the legacy FJA34020?
The FJA frame is a legacy molded case circuit breaker. In modern applications, it is typically replaced by the PowerPact H-frame series, specifically the HJA36020. However, the FJA34020 remains a direct fit for existing I-Line panelboards without requiring adapters.
How does the LI trip function operate on this breaker?
The LI designation stands for Long-Time and Instantaneous trip functions. The fixed thermal element provides Long-Time protection against sustained overloads, while the fixed magnetic element provides Instantaneous protection to quickly clear short circuits.
Can the FJA34020 be used in DC applications?
Yes, this breaker is rated for use in DC systems up to 250 VDC, where it provides an interrupting capacity of 10 kA.
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