Square D LLA36400U53X Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Quantity
Square D LLA36400U53X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for circuit protection, Square D LLA36400U53X is a 400A, 3-pole molded case circuit breaker. The 3-phase PowerPacT L breaker uses an L frame and I-Line mounting. Its electronic trip provides long-time, short-time and instantaneous functions with adjustable thermal and magnetic settings. Interrupting ratings are 125kA at 240VAC, 100kA at 480VAC and 50kA at 600VAC. Approvals include CSA, IEC, NOM and UL.Specifications
| Brand | Square D |
|---|---|
| Part Number | LLA36400U53X |
| Series | PowerPacT L |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 125kA @ 240VAC, 100kA @ 480VAC, 50kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LLA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | 3/0 AWG-500KCmil (Cu/Al) |
| Max Wire | 500 kcmil |
| Min Wire | 2/0 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSI |
| Trip Function | Long-Time, Short-Time, Instantaneous |
| Trip Adjustability | Adjustable Thermal, Adjustable Magnetic |
| Accessories | Load Side Lugs |
|---|---|
| Standards | HACR, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting |
Product FAQs
8 answersCan I adjust the current setting on the Square D LLA36400U53X below 400A?
This 400A breaker has an adjustable trip range of 160-400A. Select the setting to coordinate overload protection with the circuit conductors and load requirements.
How do I select this breaker for the available fault current?
The interrupting ratings are 125kA at 240VAC, 100kA at 480VAC and 50kA at 600VAC. Use the rating at your circuit voltage and ensure it is at least equal to the available fault current at the installation point.
What does the LSI electronic trip do?
LSI means long-time, short-time and instantaneous protection. Long-time protection addresses sustained overloads, short-time protection allows a controlled delay for coordination, and instantaneous protection acts without intentional delay on high fault currents.
What does current limiting mean when selecting this breaker?
Current limiting reduces the peak current and energy let through during faults within the breaker's current-limiting operating region. This feature helps reduce fault stress on downstream conductors and equipment.
Can I use this breaker where equipment calls for HACR-rated protection?
This breaker is HACR rated for heating, air-conditioning and refrigeration applications. Use that rating as a selection criterion when the equipment requires HACR-rated circuit protection.
How does the three-pole construction apply to a three-phase circuit?
The breaker has three poles for a three-phase circuit. A three-pole breaker interrupts the three phase conductors together, allowing the circuit to be disconnected as a unit.
What temperature range should I consider when selecting this breaker?
The temperature rating is -25C to 70C. Compare that range with the temperatures expected where the breaker will be installed.
What dimensions should I use for installation layout planning?
The breaker measures 13.40 in high, 5.50 in wide and 4.30 in deep. Use these dimensions for layout planning, with additional space allocated for wiring and operation.
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