Eaton MDLB3400 Molded Case Circuit Breaker - UL Listed
Part Number: MDLB3400
Quick Summary
Eaton MDLB3400 molded case circuit breaker protects electrical distribution panels by interrupting faults in motor and process circuits. Design teams often battle nuisance trips and protection-settings misconfigurations that cause unplanned downtime and higher maintenance costs. This device carries UL Listed certification, signaling conformance to established safety standards for industrial MCCBs used in Series C configurations. With fixed thermal and fixed magnetic trip, it delivers a 400 A rating and rated interrupt of 65 kAIC at 240 Vac and 50 kAIC at 480 Vac, compatible with 50/60 Hz systems. By matching Eaton’s Series C family, it ensures seamless integration, easy stocking, and predictable protection, delivering reliability and cost efficiency for panel builders and engineers alike.
Product Information
Extended Description
MDLB3400 Eaton: Eaton Series C complete molded case circuit breaker, MDL-frame, MDLB, Complete breaker, Fixed thermal, fixed magnetic trip type, Three-pole, 400A, 65 kAIC at 240 Vac, 50 kAIC at 480 Vac, 50/60 Hz
Product Name
Eaton Series C complete molded case circuit breaker
Catalog Number
MDLB3400
UPC
782114586273
Product Length/Depth
0.01 in
Product Height
0.01 in
Product Width
0.01 in
Product Weight
0.01 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Certifications
UL Listed
Amperage Rating
400 A
Trip Type
T186
Circuit breaker type
MDLB
Circuit breaker frame type
Complete breaker
Series
Series C
Frame
MDL
Frequency rating
50 to 60 Hz
Interrupt rating
65 kAIC at 240 Vac 50 kAIC at 480 Vac
Number of poles
Three-pole
Application of Multi-Wire Terminals for Molded Case Circuit Breakers
Application of Multi-Wire Terminals for Molded Case Circuit Breakers
Application of Multi-Wire Terminals for Molded Case Circuit Breakers
Motor protection circuit breakers product aid
Motor protection circuit breakers product aid
Motor protection circuit breakers product aid
Motor protection circuit breakers product aid
Motor protection circuit breakers product aid
Motor protection circuit breakers product aid
Motor protection circuit breakers product aid
Breaker service centers
Circuit Protection, Molded Case Circuit Breakers, Volume 4, Tab 2
Circuit Breakers Explained
Circuit Breakers Explained
Series C F-Frame molded case circuit breakers
Series C F-Frame molded case circuit breakers
Series C F-Frame molded case circuit breakers
Series C F-Frame molded case circuit breakers
Series C F-Frame molded case circuit breakers
Feature → Business Impact → Application: The MDLB3400 provides a 400 A amperage rating for high-current feeders, reducing the risk of nuisance trips while enabling safe motor and process circuit protection. This translates to improved uptime and lower repair costs in manufacturing lines, packaging systems, and conveyors that demand robust current handling. Feature → Business Impact → Application: Fixed thermal and fixed magnetic trip deliver deterministic protection, minimizing coordination surprises during short circuits and overloads, which reduces downtime and enhances panel reliability in automation racks. Feature → Business Impact → Application: 65 kAIC at 240 Vac and 50 kAIC at 480 Vac interrupt ratings enable selective disconnection across multi-tier distribution, supporting compliant fault isolation in complex manufacturing cells and data-driven maintenance programs. Feature → Business Impact → Application: Series C MDL frame with three poles streamlines installation and stocking for panel builders, enabling faster assembly, easier troubleshooting, and consistent performance across new builds and retrofit projects. Feature → Business Impact → Application: UL Listed certification and a standardized protection platform offer risk reduction for audits and regulatory reviews, while compatibility with 50/60 Hz systems supports global plant footprints and shared spares. Warranty and service terms reinforce confidence in long-term ownership, with a one-year policy from installation or 18 months from shipment, whichever comes first.
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FAQs
Yes. The MDLB3400 is a three-pole molded case circuit breaker designed with the MDL frame and Series C family in mind, aligning with common 3-phase panel boards. Its fixed thermal-magnetic trip simplifies coordination and minimizes field calibration. When retrofitting, verify panel bus stabs and conductor sizing match the 400 A rating to maintain proper protection and accurate trip performance.
Core specs include 400 A amperage rating, 65 kAIC interrupt at 240 Vac, and 50 kAIC at 480 Vac, with a 50/60 Hz frequency rating and T186 trip type. These figures indicate strong fault interruption capability for high-current loads and compatibility with global electrical systems. The UL Listed certification further confirms safety compliance. Use these values to plan protection coordination and selectivity in motor drives and process lines.
The MDLB3400 excels in motor control centers, panel boards, and machine automation cabinets where high-current protection and reliable short-circuit interruption are critical. Its three-pole design and Series C compatibility support standard industrial layouts, while the 50/60 Hz rating enables use in facilities with varying power grids. This makes it ideal for manufacturing lines, material handling, and process industries seeking predictable protection performance.
UL Listed certification is the primary credential available for this model, signaling compliance with established safety standards for molded case circuit breakers. In addition, its 50/60 Hz operation supports compliance with regional electrical codes. For site-specific requirements, consult your local codes and consider cross-referencing with UL 489 standards commonly associated with MCCBs to ensure full scope conformity.
With fixed thermal-magnetic trip and a robust 400 A rating, maintenance intervals are typically low, reducing planned downtime and spare parts consumption. The UL Listed reliability and compatibility with Series C families simplify stocking and replacement, contributing to faster maintenance windows and improved asset uptime. The one-year warranty from installation (or 18 months from shipment) provides initial value protection as part of total cost of ownership discussions.