Square D - LA36400 400A 3-Pole 600V I-Line Plug-In Circuit Breaker
Square D - LA36400 400A 3-Pole 600V I-Line Plug-In Circuit Breaker
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The Square D LA36400 is a 3-pole, 400-amp thermal magnetic molded case circuit breaker (MCCB) rated for 600VAC with I-Line plug-in mounting. Manufactured by Schneider Electric, the LA-frame breaker delivers high-capacity overcurrent and short-circuit protection for large industrial feeder and main circuits. The I-Line plug-in interface allows for fast installation and replacement in compatible Square D switchboards and panelboards, making it a standard choice for heavy industrial power distribution.
Specifications
| Attribute | Value |
|---|---|
| Part Number | LA36400 |
| Manufacturer | Square D / Schneider Electric |
| Amperage Rating | 400A |
| Voltage Rating | 600VAC |
| Number of Poles | 3 |
| Trip Type | Thermal Magnetic |
| Mount Type | I-Line Plug-In |
| Interrupting Rating | 30kA @ 480V |
| Standard | UL 489 Listed |
| Frame Series | LA |
Key Features
- I-Line plug-in design for quick installation and removal in Square D I-Line switchboards
- Thermal magnetic trip for reliable overload and instantaneous short-circuit protection
- 400-amp capacity for high-current main and feeder circuit protection
- 3-pole design for three-phase 600VAC industrial distribution systems
- LA frame standard in Square D I-Line switchboard applications
- UL 489 Listed, NEC compliant
Common Applications
- 400A main or feeder breaker in industrial I-Line switchboards
- Large motor control center (MCC) incoming feeder protection
- Heavy manufacturing plant distribution panels
- Industrial sub-main circuit protection at 600V
- Utility and process industry high-capacity power distribution
Frequently Asked Questions
What is the Square D LA36400?
The Square D LA36400 is a 400-amp, 3-pole, 600V thermal magnetic I-Line plug-in MCCB used as a main or feeder circuit breaker in heavy industrial and commercial three-phase 600VAC switchboards and panelboards.
What is the interrupting rating of the LA36400?
The Square D LA36400 has a standard interrupting capacity of 30kA at 480V. This is suitable for most industrial distribution systems; for higher available fault current environments, consider the LJA36400U43X with a solid-state trip and higher interrupting rating.
What is the difference between LA36400 and LJA36400U43X?
The LA36400 uses a thermal magnetic trip unit (fixed settings), while the LJA36400U43X uses an adjustable solid-state electronic trip unit, offering higher interrupting capacity and flexible protection coordination. The LJA is preferred for systems requiring selective coordination or higher fault-current protection.