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Square D LH36400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Square D
LH36400
Molded Case Circuit Breaker
Brand
Square D
SKU
LH36400
Quantity
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Square D LH36400 - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D LH36400 - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | LH36400 |
| Series | LH |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 50kA @ 250VDC |
| Frame Type | LH |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | (1) 1 AWG-600 kcmil (Al/Cu) or (2) 1 AWG-250 kcmil (Al/Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs (AL400LA) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Push-To-Trip, Trip-Free Mechanism |
Quantity
Square D LH36400 - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | LH36400-R |
| Series | LH |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 50kA @ 250VDC |
| Frame Type | LH |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | (1) 1 AWG-600 kcmil (Al/Cu) or (2) 1 AWG-250 kcmil (Al/Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs (AL400LA) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Push-To-Trip, Trip-Free Mechanism |
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Description
Engineered for industrial applications, the Square D LH36400 is a 3-pole, 400A MCCB from the legacy L-Frame family. It provides robust thermal-magnetic protection with fixed thermal and adjustable magnetic trip settings. This breaker utilizes an I-Line mounting style for quick installation into Square D I-Line panelboards and switchboards. It serves as a direct replacement for older installations and is superseded by the LGA36400U31X. Rated 35kA at 480VAC, it features a push-to-trip mechanism.Specifications
| Brand | Square D |
|---|---|
| Part Number | LH36400 |
| Series | LH |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 50kA @ 250VDC |
| Frame Type | LH |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | (1) 1 AWG-600 kcmil (Al/Cu) or (2) 1 AWG-250 kcmil (Al/Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs (AL400LA) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Push-To-Trip, Trip-Free Mechanism |
Product FAQs
6 answersWhat equipment is the Square D LH36400 breaker compatible with?
The LH36400 features an I-Line plug-in mounting style, making it compatible exclusively with Square D I-Line panelboards and switchboards. It is not designed for standard unit-mount or bolt-on enclosures.
Can I run parallel conductors on the load side of the LH36400?
Yes, the factory-installed load lugs are designed to accept either a single 1 AWG to 600 kcmil conductor or two parallel 1 AWG to 250 kcmil conductors per phase. The lugs are rated for both copper and aluminum wire.
How are connections made on the line and load sides of this breaker?
The line side utilizes an I-Line plug-in jaw mechanism that mounts directly to the panelboard bus assembly. The load side comes equipped with mechanical lugs for terminating field wiring.
Can the trip settings on the LH36400 be adjusted?
Yes, this breaker features a thermal-magnetic trip unit with a fixed long-time thermal setting and an adjustable instantaneous magnetic trip function, allowing you to fine-tune the short-circuit response.
What is the difference between the Square D LH36400 and the LA36400?
Both are 400-amp, 3-pole L-frame breakers that utilize the exact same I-Line plug-in connection and share physical dimensions. The LH36400 is the high-interrupting model (rated 35kA at 480VAC), whereas the standard LA36400 is rated at 30kA at 480VAC.
What safety precautions apply to installing an I-Line circuit breaker?
Installation must be performed by a qualified electrician in accordance with NEC requirements. The panelboard or switchboard must be completely de-energized, locked out, and tested for absence of voltage before plugging the breaker onto the bus or terminating load conductors.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
2 reviews
- MLMatthew L.Verified BuyerReviewingSquare D LH36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/21/26Super Breakers Does It Again!
New, in excellent condition, cheaper and faster than the competition
- MGMarkus G.Verified BuyerReviewingSquare D LH36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/4/25it states correctly what it was
Product as described