Square D LLA36400U54XEKYP Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Quantity
Square D LLA36400U54XEKYP - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for commercial and industrial applications, the LLA36400U54XEKYP delivers advanced circuit protection with its MicroLogic 6.3 E electronic trip unit. This 3-pole, 400A breaker installs into Square D I-Line panelboards and switchboards, serving as a direct upgrade for legacy LA36400 and LH36400 models. Rated at 100 kAIC at 480VAC, it provides adjustable long-time, short-time, instantaneous, and ground fault (LSIG) functions, plus factory-installed key interlock and padlock attachments.Specifications
| Brand | Square D |
|---|---|
| Part Number | LLA36400U54XEKYP |
| Series | LLA |
| 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 | I-Line Panelboards, I-Line Switchboards |
| Wire Gauge | (2) 2/0 AWG-500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 2/0 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSIG |
| Trip Function | Long-Time, Short-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Adjustable |
| Trip Unit Model | Energy |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Communication Module |
|---|---|
| Accessories | Load Side Lugs Included, Handle Padlock Attachment (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | Current Limiting, HACR Rated, True RMS Sensing, Ground Fault Protection, Phase Loss Protection |
Product FAQs
8 answersWhat type of enclosures or panels accept the LLA36400U54XEKYP?
This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It features a plug-in mounting style that connects directly to the I-Line bus stack.
What does the U54X trip unit provide on this PowerPacT L-frame breaker?
The U54X designates a MicroLogic 6.3 E (Energy) electronic trip unit. It delivers adjustable LSIG (Long-time, Short-time, Instantaneous, and Ground-fault) protection and includes integrated energy metering for advanced power monitoring.
What are the standard lug wire range specifications for this 400A breaker?
The factory lugs accommodate two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase. Ensure proper torque specifications are followed during installation as outlined on the breaker faceplate.
What do the XEKYP suffixes mean at the end of the catalog number?
The 'X' specifies the I-Line connection type. The 'EKYP' portion indicates a specific bundle of factory-installed accessories, which typically includes communication modules like a Breaker Status and Control Module (BSCM) with an NSX cord, along with auxiliary contacts or wire harnesses.
How does the LLA interrupting tier compare to other PowerPacT L-frame breakers?
The second letter in the LLA catalog number denotes the 'L' interrupting rating class. This provides a higher short-circuit capacity (100kA at 480VAC) compared to the standard 'G' class (35kA at 480VAC) and 'J' class (65kA at 480VAC).
Can this I-Line breaker be reverse-fed?
No. Circuit breakers with I-Line plug-in connections are not suitable for reverse connection. They must be fed directly from the I-Line bus.
Does the MicroLogic 6.3 E trip unit require an external power supply to function?
The basic LSIG overcurrent protection is self-powered by the current flowing through the breaker. However, an external 24VDC power supply is required to operate the LCD display, advanced energy metering, and communication features when the breaker is open or under low load conditions.
Is this breaker 100% rated or standard 80% rated?
Unless specified with a 'C' in the catalog number (such as LLA36400CU54X), standard PowerPacT L-frame breakers like this one are 80% rated for continuous current.
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