Schneider ElectricLGL36400U31X
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Square D LGL36400U44X Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Square D
LGL36400U44X
Molded Case Circuit Breaker
Brand
Square D
SKU
LGL36400U44X
Quantity
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Square D LGL36400U44X - 400A 3 Pole Molded Case Circuit Breaker
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Description
Built for demanding industrial environments, the Square D LGL36400U44X is a standard 80% rated PowerPacT L-Frame molded case circuit breaker. It provides 400A of continuous current handling with a 35kAIC rating at 480VAC. The integrated MicroLogic 6.3A electronic trip unit offers precise coordination through adjustable long-time, short-time, instantaneous, and ground-fault (LSIG) functions, alongside a built-in ammeter. This unit-mount breaker is ideal for motor control centers.Specifications
| Brand | Square D |
|---|---|
| Part Number | LGL36400U44X |
| Series | LGL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 18kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LGL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Switchboards, Motor Control Centers, Enclosures |
| 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 | MicroLogic 6.3A |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Motor Operator, Rotary Handle, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs (AL600LS52K3) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, HACR, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | 80% Rated, HACR Rated, Current Limiting, True RMS Sensing |
Product FAQs
8 answersWhat does the "U44X" suffix indicate on the LGL36400U44X circuit breaker?
The U44X suffix designates a MicroLogic 6.3A electronic trip unit. While the standard LSIG protection is listed in the specs, the "A" in 6.3A specifically indicates an integrated ammeter for local current monitoring and phase measurement.
Is the Square D LGL36400U44X rated for 100% continuous current?
No, this is a standard 80% rated circuit breaker. Continuous loads should not exceed 320 amps (80% of its 400A nominal rating) in accordance with standard National Electrical Code (NEC) guidelines.
Can the trip unit on the LGL36400U44X be upgraded or replaced?
Yes, PowerPacT L-frame circuit breakers feature field-interchangeable trip units. The factory-installed MicroLogic 6.3A unit can be swapped for other compatible MicroLogic units if advanced power metering or energy management features are required in the future.
What is the difference between the LGL36400U44X and the LJL36400U44X?
The difference lies in the interrupting rating. The LGL frame has a 35kAIC rating at 480VAC, whereas the LJL frame offers a higher 65kAIC rating at 480VAC. Both share the same physical dimensions, 400A capacity, and MicroLogic 6.3A trip unit.
Is the LGL36400U44X compatible with Square D I-Line panelboards?
No, this is a unit-mount circuit breaker designed for feed-thru connections using lugs. It does not have the plug-on jaw connections required for I-Line panelboards. For I-Line applications, you would need an L-frame breaker with an "LGA" catalog prefix, such as the LGA36400U44X.
How is the MicroLogic 6.3A trip unit adjusted on this breaker?
The MicroLogic 6.3A trip unit features rotary dials on the front of the breaker to adjust the pickup and delay settings for Long-Time, Short-Time, Instantaneous, and Ground-Fault protection. The integrated LCD screen and keypad allow for fine-tuning and visual confirmation of these settings.
What is the recommended tightening torque for the lugs on the LGL36400U44X?
The factory-installed AL600LS52K3 lugs should be torqued to 442.5 lbf-in (50 N.m) when securing the 2/0 AWG to 500 kcmil conductors. Always verify torque specifications on the breaker faceplate label before finalizing the installation.
What are the physical dimensions of the LGL36400U44X circuit breaker?
This PowerPacT L-frame breaker measures 11.3 inches in height, 5.5 inches in width, and 6.61 inches in depth.
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