Free Shipping Over $99
Square D MAL36400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Square D
MAL36400
Molded Case Circuit Breaker
Brand
Square D
SKU
MAL36400
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Square D MAL36400 - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D MAL36400 - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | MAL36400 |
| Series | MAL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 14kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Motor Control Centers |
| Wire Gauge | (3) 3/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Undervoltage Release, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Line and Load Lugs (AL900MA) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Quantity
Square D MAL36400 - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | MAL36400-R |
| Series | MAL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 14kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Motor Control Centers |
| Wire Gauge | (3) 3/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Undervoltage Release, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Line and Load Lugs (AL900MA) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Similar Items
500A 3 Pole Molded Case Circuit Breaker
700A 3 Pole Molded Case Circuit Breaker
1000A 3 Pole Molded Case Circuit Breaker
Description
Built for demanding industrial environments, the Square D MAL36400 delivers high-capacity overcurrent defense. This 400A, 3-pole MCCB utilizes a thermal-magnetic trip mechanism with long-time and instantaneous (LI) functions and an adjustable magnetic trip. This unit mount breaker integrates into Square D switchboards and motor control centers. Part of the legacy M-Frame family, it maintains existing infrastructure and is superseded by the MGA36400. It features a 42kAIC rating at 240VAC.Specifications
| Brand | Square D |
|---|---|
| Part Number | MAL36400 |
| Series | MAL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 14kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Motor Control Centers |
| Wire Gauge | (3) 3/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Undervoltage Release, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Line and Load Lugs (AL900MA) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
7 answersIs the Square D MAL36400 still manufactured?
The MAL36400 is a legacy M-frame circuit breaker and is no longer in active production. It has been superseded by the modern PowerPact M-frame series, such as the MGA36400, though the MAL36400 remains available for maintaining existing infrastructure.
What is the adjustable magnetic trip range for the MAL36400?
The instantaneous magnetic trip on this 400A breaker can be adjusted between 2000A and 4000A. This allows electricians to coordinate the breaker with specific load requirements and prevent nuisance tripping.
Can the MAL36400 be installed in an I-Line panelboard?
No. The MAL36400 is a unit-mount, feed-thru circuit breaker designed for use in Square D switchboards and motor control centers. It does not have the plug-on jaw connections required for I-Line panelboards.
What wire sizes are accepted by the standard lugs on the MAL36400?
The standard lugs accept up to three aluminum or copper conductors ranging from 3/0 AWG to 500 kcmil per phase. Ensure proper torque specifications are followed during installation.
Is the MAL36400 suitable for direct current applications?
Yes, this thermal-magnetic breaker is rated for use in DC systems up to 250VDC, providing a DC interrupting capacity of 14kA.
What safety precautions apply when adjusting the magnetic trip settings?
Always ensure the breaker is de-energized and properly locked out before making any adjustments to the trip unit. Verify that the settings match the coordination study for your specific switchboard or motor control center to ensure proper fault protection.
Does the MAL36400 include ground fault protection?
No, the MAL36400 features an LI (Long-Time and Instantaneous) trip unit. It provides thermal overload and magnetic short-circuit protection but does not have integrated equipment ground fault protection.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 5 reviews.
Search
Rating
5 reviews
- JMJAY M.Verified BuyerReviewingSquare D MAL36600 - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars12/29/25POLE CIRCUIT BREAKER
SQUARE D CIRCUIT BREAKER DELIVERED REAL FAST AND AT A GREAT PRICE
- DFDavid F.Verified BuyerReviewingSquare D MAL36800 - 800A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/14/25thank you for all your
thank you for all your help
- RRyanReviewingSquare D MAL361000 - 1000A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/27/245 Stars
Amazing costumer service
- MCMARCUS C.ReviewingSquare D MAL36600 - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/4/23Great supplier /saves the Bacon every time
I did not know it shipped - I will check - you guys are great
- JMJohn M.ReviewingSquare D MAL36600 - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars12/13/21Clean and very well packaged
Breaker arrived as advertised. Very clean, wrapped and packed with alot of care to ensure it arrived safely.