Square D - LJA36400U43X 400A 3-Pole 600V I-Line Solid State Circuit Breaker
Square D - LJA36400U43X 400A 3-Pole 600V I-Line Solid State Circuit Breaker
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The Square D LJA36400U43X is a 3-pole, 400-amp solid-state molded case circuit breaker (MCCB) rated for 600VAC with I-Line plug-in mounting. Manufactured by Schneider Electric, this LJ-frame breaker features an adjustable electronic solid-state trip unit for precise, selective overcurrent protection in high-capacity industrial feeder and main circuit applications. It combines high interrupting capacity with flexible trip settings for demanding three-phase 600V power systems.
Specifications
| Attribute | Value |
|---|---|
| Part Number | LJA36400U43X |
| Manufacturer | Square D / Schneider Electric |
| Amperage Rating | 400A |
| Voltage Rating | 600VAC |
| Number of Poles | 3 |
| Trip Type | Solid State (Electronic) |
| Mount Type | I-Line Plug-In |
| Interrupting Rating | 65kA @ 600V |
| Standard | UL 489 Listed |
| Frame Series | LJ |
Key Features
- Adjustable solid-state trip unit with long-time, short-time, and instantaneous settings for selective coordination
- I-Line plug-in mounting for fast installation in Square D LJ-frame I-Line switchboards
- 400-amp capacity for heavy industrial main and feeder circuit protection
- 3-pole for complete three-phase 600V protection
- High 65kA interrupting rating at 600V
- UL 489 Listed, NEC compliant
Common Applications
- 400A main and feeder breaker in heavy industrial I-Line switchboards
- Motor control center (MCC) main incoming protection
- Large manufacturing plant main distribution panels
- Process plant and refinery electrical distribution systems
- High fault-current industrial environments requiring 65kA interrupting
Frequently Asked Questions
What is the Square D LJA36400U43X?
The LJA36400U43X is a 400-amp, 3-pole, 600V solid-state I-Line plug-in MCCB from Square D used for main and feeder circuit protection in heavy industrial three-phase 600V electrical distribution systems.
What does U43X mean in the LJA36400U43X part number?
The U43X suffix on Square D solid-state MCCBs identifies the rating plug configuration of the electronic trip unit, which determines the adjustable current range (pickup and delay settings) available on the breaker. Consult Schneider Electric documentation for the specific ranges associated with U43X.
Is the LJA36400U43X available as new and used?
Yes. Alpha Brokers & Controls stocks the Square D LJA36400U43X in new condition. Contact us for current pricing and availability.