LC36400 - Square D - Molded Case Circuit Breaker I-Line Plug-In - 400 Amp - 3 Pole - 600 Volt
LC36400 - Square D - Molded Case Circuit Breaker I-Line Plug-In - 400 Amp - 3 Pole - 600 Volt
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Square D LC36400 – 400 Amp Molded Case Circuit Breaker, I-Line Plug-In
A dependable solution for commercial power systems, the Square D LC36400 is a 400A legacy molded case circuit breaker using proven thermal-magnetic trip technology to deliver long-time and instantaneous (LI) protection. This 3-pole breaker is designed for Square D I-Line panelboards and switchboards, offering a secure connection.
For current replacements, the manufacturer recommends the PowerPacT LJA36400U31X. It boasts an extra-high interrupting capacity of 65 kAIC at 480VAC.
Product Specifications
| Brand | Square D / Schneider Electric |
| Series | LC (Legacy L-Frame) |
| Part Number | LC36400 |
| Amperage | 400A |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Poles | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 10kA @ 250VDC |
| Mounting Style | I-Line Plug-In |
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Trip Technology | Thermal Magnetic |
| Trip Function | LI – Long-Time, Instantaneous (Fixed Thermal, Adjustable Magnetic) |
| Wire Range | (2) 4/0 AWG – 500 kcmil (Al/Cu) |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approvals | CSA, IEC, UL |
| Temp Rating | 40°C |
| Construction Features | Extra High Interrupting Capacity, HACR Rated |
Why Choose the Square D LC36400?
- Extra High Interrupting Capacity: 100 kA at 240VAC for demanding faults.
- LJA36400U31X Manufacturer Recommendation: Direct current-production replacement.
- Secure I-Line Connection: Installs into Square D I-Line panelboards and switchboards.
- Heavy-Gauge Wire Capacity: Accepts up to (2) 500 kcmil conductors.
Common Applications
- Large feeder and distribution circuits
- Commercial and industrial switchgear
- Legacy L-Frame panelboard maintenance
- High-capacity manufacturing power systems
Frequently Asked Questions
What panels is the LC36400 compatible with?
Square D I-Line panelboards and switchboards that accept plug-in breakers.
What is the interrupting rating of the LC36400?
65 kA at 480VAC, 100 kA at 240VAC, 35 kA at 600VAC, and 10 kA at 250VDC.
What is the current replacement for the LC36400?
The manufacturer recommends the PowerPacT LJA36400U31X.
Is the trip unit adjustable?
Fixed thermal with an adjustable magnetic setting.
Is this a new unit?
Yes — this listing (SKU LC36400-N) is new-in-box and ready for immediate installation.