Square D IL34400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Quantity
Square D IL34400 - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Utilizing advanced I-Limiter technology, this 400A molded case circuit breaker delivers top-tier 200kAIC protection at 480V without requiring external fuses. The current-limiting capability significantly reduces let-through energy, preserving the integrity of your electrical infrastructure. It features a specialized mounting bracket for quick integration into Square D I-Line switchboards. Facilities upgrading their systems often transition from this model to the newer LIL36400 equivalent.Specifications
| Brand | Square D |
|---|---|
| Part Number | IL34400-R |
| Series | IL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | 1 AWG - 600 kcmil (Al/Cu) or (2) 1 AWG - 250 kcmil (Al/Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 1 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, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, HACR Rated, Visual Trip Indicator |
| Special Features | Current Limiting |
Product FAQs
5 answersWhich panelboards accept the IL34400 circuit breaker?
This breaker is designed for Square D I-Line panelboards and switchboards. It utilizes an I-Line style plug-in connection for the line side, allowing for rapid installation.
The IL34400 is obsolete. What is the modern equivalent for system upgrades?
Facilities upgrading their electrical systems typically transition from the IL34400 to the newer LIL36400 equivalent. The LIL36400 is a PowerPact L-frame breaker that provides the same 400A capacity and current-limiting protection.
What wire sizes and materials are compatible with the lugs on this breaker?
The load-side terminals accept either a single 1 AWG to 600 kcmil wire or dual 1 AWG to 250 kcmil wires. Both aluminum and copper conductors are supported.
How does the current-limiting feature of the IL34400 protect downstream equipment?
As part of the I-Limiter family, this breaker is engineered to clear high-level faults rapidly. By interrupting up to 200kA at 480VAC, it significantly reduces peak let-through current and energy, minimizing thermal and magnetic stress on your electrical infrastructure.
Does the IL34400 require external fuses to achieve its maximum interrupting rating?
No. The advanced I-Limiter technology allows this molded case circuit breaker to deliver its full 200kAIC protection at 480VAC entirely on its own, eliminating the need for external fuses.
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