Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Eaton / Cutler-Hammer MDL3400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Eaton / Cutler-Hammer
MDL3400
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
MDL3400
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Eaton / Cutler-Hammer MDL3400 - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Similar Items
500A 3 Pole Molded Case Circuit Breaker
300A 3 Pole Molded Case Circuit Breaker
600A 3 Pole Molded Case Circuit Breaker
Description
Delivering reliable 400A protection, the Eaton MDL3400 is a 3-pole MCCB engineered for industrial power distribution. It utilizes thermal-magnetic technology to provide essential long-time and instantaneous (LI) defense. The M-Frame breaker fits into Eaton Series C panelboards and switchboards. It serves as a direct substitute for the HMDL3400 when a 65 kAIC rating at 240V is acceptable. This HACR-rated unit supports reverse feed capabilities and includes factory-installed lugs.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | MDL3400 |
| Series | MDL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 50kA @ 480VAC, 25kA @ 600VAC, 22kA @ 250VDC |
| Frame Type | MDL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | (2) 1 AWG-500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Line and Load Lugs |
| Standards | HACR Rated, UL 489, CSA C22.2 No. 5, IEC 60947-2, NEMA AB-1 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Interchangeable Trip |
Product FAQs
8 answersIs the Eaton MDL3400 a direct replacement for the Cutler-Hammer MDL3400?
Yes. Eaton acquired Cutler-Hammer, and the Eaton MDL3400 is the exact direct replacement for the legacy Cutler-Hammer MDL3400. They share the same physical dimensions, Series C M-Frame footprint, and electrical ratings.
What is the difference between the MDL3400 and the HMDL3400?
The difference is the interrupting capacity. The MDL3400 is the standard interrupting version rated at 50 kAIC at 480VAC, while the HMDL3400 is the high interrupting version rated at 65 kAIC at 480VAC. Both share the same physical M-Frame dimensions and accept the same accessories.
What types of equipment is the MDL3400 compatible with?
This Series C M-Frame breaker is designed for use in Eaton and Cutler-Hammer Series C panelboards, switchboards, and motor control centers.
Can the MDL3400 be used in DC electrical systems?
Yes, this breaker is equipped with a thermal magnetic trip unit, which allows it to function safely in DC applications. It is rated for up to 250VDC with a maximum interrupting capacity of 22 kAIC.
What size wire is accepted by the standard lugs on the MDL3400?
The standard factory lugs accept two wires per phase, ranging from 1 AWG to 500 kcmil. The terminals are rated for both copper (Cu) and aluminum (Al) conductors.
Where can I find the correct torque specifications for the MDL3400 lugs?
The required torque values for the line and load terminals are printed directly on the circuit breaker front nameplate. Always use a calibrated torque wrench during installation to prevent terminal overheating and nuisance tripping.
Is the MDL3400 suitable for reverse feed applications?
No. Standard MDL frame breakers with interchangeable trip units, like the MDL3400, are not rated for reverse feed. Only the factory sealed MDLB and HMDLB versions are suitable for reverse feed applications.
Are the trip settings on the MDL3400 adjustable?
No, the MDL3400 features a fixed thermal and fixed magnetic (LI) trip unit. If you require adjustable trip settings, you will need to select an M-Frame breaker equipped with an electronic trip unit, such as a Digitrip RMS.
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.