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Square D LAP36400MT Circuit Breaker
- 400
- 3 Pole
- Unit
Square D
LAP36400MT
Circuit Breaker
Brand
Square D
SKU
LAP36400MT
Quantity
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Square D LAP36400MT 3 Pole Circuit Breaker
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Square D LAP36400MT 3 Pole Circuit Breaker
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| Brand | Square D |
|---|---|
| Part Number | LAP36400MT |
| Series | LA |
| Amperage | 400 A |
| Poles | 3 |
| Mounting Style | Unit |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 30kA@480V |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Motor Control Centers, Control Panels |
| Wire Gauge | 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, Padlock Attachment |
|---|---|
| Accessories | Line Side Lugs Included, Plug-On Shroud (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Quantity
Square D LAP36400MT 3 Pole Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Series | LA |
| Amperage | 400 A |
| Poles | 3 |
| Mounting Style | Unit |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 30kA@480V |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Motor Control Centers, Control Panels |
| Wire Gauge | 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, Padlock Attachment |
|---|---|
| Accessories | Line Side Lugs Included, Plug-On Shroud (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
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Description
Square D LAP36400MT 3 Pole Circuit Breaker
The Square D LAP36400MT is a 3 Pole thermal magnetic molded case circuit breaker with a current rating of 400 Amps and a voltage rating of 600VAC, 250VDC. It has an interrupting rating of 30kAIC at 480V. The LAP36400MT has a bolt-on connection type and includes long time and instantaneous trip functions.
Specifications
| Brand | Square D |
|---|---|
| Series | LA |
| Amperage | 400 A |
| Poles | 3 |
| Mounting Style | Unit |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 30kA@480V |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Motor Control Centers, Control Panels |
| Wire Gauge | 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, Padlock Attachment |
|---|---|
| Accessories | Line Side Lugs Included, Plug-On Shroud (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
5 answersWhat does the MT suffix indicate on the LAP36400MT catalog number?
The MT suffix signifies that this circuit breaker includes a factory-installed plug-on shroud. This shroud is typically located on the OFF end of the breaker to facilitate specific connections in Square D switchboards and motor control centers.
Is the LAP36400MT compatible with Square D I-Line panelboards?
No. The LAP36400MT is a unit-mount (bolt-on) circuit breaker designed for switchboards, motor control centers, and control panels. I-Line panelboards require a breaker with plug-on jaw connections, such as the standard LA36400.
How does the adjustable magnetic trip function on the LAP36400MT?
While the thermal overload protection is fixed, the instantaneous magnetic trip element can be adjusted. This allows panel builders and electricians to tune the short-circuit response range to properly coordinate with downstream devices and specific motor loads.
How can I safely verify the mechanical operation of this breaker?
The LAP36400MT is equipped with a push-to-trip button on the front face. This feature allows electricians to manually trip the breaker mechanism and verify its mechanical integrity without requiring exposure to live electrical parts.
What is the modern replacement path for the legacy LAP36400MT?
While the LAP36400MT remains available for maintaining existing systems, facilities upgrading to modern switchgear typically replace these legacy L-Frame breakers with Square D PowerPact L-Frame models (such as the LJA series) using an appropriate retrofit kit.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 13 reviews.
Total 5 star reviews: 13 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
13 reviews
- RGRobert G.Verified BuyerReviewingSquare D LA36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/16/26LA36400
Perfectly boxed and arrived on time. Thanks for the shirt and stickers as well.
- CECraig E.Verified BuyerReviewingEaton / Cutler-Hammer LA3600 - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/13/25Westinghouse breaker
Excellent customer service and quick shipping
- CLClifton L.Verified BuyerReviewingSquare D LA36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/30/25estimator
Good
- BCBenjamin C.Verified BuyerReviewingEaton / Cutler-Hammer LA3225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/4/25Refurbished Breaker
Breaker seems to be working great, no complaints from Client
- JMJerry M.ReviewingEaton / Cutler-Hammer LA3400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/14/23Where is my breaker?
Where is my breaker?