Square D FDA140305 Molded Case Circuit Breaker
- 30A
- 1 Pole
- I-Line
Quantity
Square D FDA140305 - 30A 1 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for heavy-duty applications, this 1-pole, 30A MCCB offers reliable thermal-magnetic protection. It handles long-time and instantaneous fault conditions. The unit is configured for Square D I-Line panelboards with a Phase C connection. It serves as a replacement for legacy F-frame installations, though the BDA140305 is recommended for new projects. With an 18kAIC rating at 277VAC, it provides robust short-circuit protection and features a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Series | FDA |
| Amperage | 30A |
| Poles | 1 |
| Mounting Style | I-Line |
| Voltage | 120VAC, 277VAC, 125VDC |
| Phase | 1 |
| AIC Rating | 25kA @ 120VAC, 18kA @ 277VAC, 10kA @ 125VDC |
| Frame Type | FDA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards |
| 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 |
|---|---|
| Accessories | Phase C Connection (Suffix 5) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
Product FAQs
8 answersWhat type of panelboard is the FDA140305 designed for?
This breaker features an I-Line style plug-in connection and is exclusively designed for use in Square D I-Line panelboards and switchboards. It will not fit in standard load centers like QO or Homeline.
How does the I-Line connection on the FDA140305 work?
The I-Line mounting system uses a plug-on design where the breaker's line-side jaws push directly onto the panelboard bus stack. A mounting bracket and retaining screw secure the breaker to the backpan, ensuring a solid mechanical and electrical connection without the need for line-side cabling.
Can this 1-pole breaker be used in DC applications?
Yes, the FDA140305 is rated for use in DC circuits up to 125VDC, with a DC interrupting rating of 10kA. This makes it suitable for specific control circuits or battery-backed systems requiring 1-pole DC protection.
What wire sizes and materials are accepted by the load lugs on this breaker?
The factory-installed mechanical lugs accept both copper and aluminum conductors ranging from 14 AWG to 4 AWG. Ensure proper torque specifications are followed during installation to prevent thermal issues at the termination.
Is the FDA140305 a current production breaker?
The FDA series is part of Square D's legacy F-Frame molded case circuit breaker line. While still widely used and supported in existing installations, Schneider Electric has transitioned modern F-Frame applications to the newer PowerPacT B-Frame and H-Frame series.
How does the thermal-magnetic trip unit operate in the FDA140305?
The breaker uses a fixed LI (Long-Time, Instantaneous) trip unit. The Long-Time thermal function uses a bimetallic strip to protect against sustained overloads, while the Instantaneous magnetic function trips immediately during a short circuit. Both trip points are factory calibrated and cannot be adjusted in the field.
Can I use this F-Frame breaker to replace an older FA or FH 1-pole breaker?
Yes, the FDA frame shares the same physical dimensions and I-Line mounting footprint as other legacy Square D F-Frame breakers like the FA and FH series. Always verify that the voltage, amperage, and interrupting ratings meet or exceed the requirements of the circuit you are replacing.
What does the 18kAIC at 277V rating mean for this breaker?
The 18kAIC rating indicates the maximum fault current (18,000 amps) the breaker can safely interrupt at 277VAC without sustaining catastrophic damage. It also carries a higher 25kAIC rating for 120VAC applications, allowing it to be used in systems with varying available fault currents.
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