Eaton E2LEM3400MWU66 E2 mining MCCB - UL Listed
Part Number: E2LEM3400MWU66
Quick Summary
Eaton E2LEM3400MWU66 is a mining complete molded case circuit breaker designed for rugged underground applications. This unit helps avoid costly downtime by delivering predictable tripping and fast fault isolation in demanding environments. It carries UL Listed, IEC rated, and CSA Certified marks, supporting global safety compliance and interconnection with mine power systems. Built for mining MCCB installations, the L-frame complete breaker supports a wide trip range and reliable magnetic protection for critical equipment. The design aligns with industry best practices for safety, maintenance, and compliance in mining operations. Designed for straightforward Retrofit and integration with E2 accessories, it simplifies field service and reduces total cost of ownership.
Product Information
Extended Description
E2LEM3400MWU66 Eaton: Eaton E2 mining complete molded case circuit breaker, L-frame, E2LEM, Complete breaker, Interchangeable magnetic only trip, 500-2500A trip rating, Three-pole, 400A, 1000Y/577 Vac, 250 Vdc, no terminals, Mining, 120 Vac rear w/ left pigtail
Product Name
Eaton E2 mining complete molded case circuit breaker
Catalog Number
E2LEM3400MWU66
UPC
782114345900
Product Length/Depth
4.06 in
Product Height
10.75 in
Product Width
8.25 in
Product Weight
20 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 IEC Rated CSA Certified
Type
E2 mining
Amperage Rating
400 A
Voltage rating
1000Y/577 Vac, 250 Vdc
Trip Type
T205
Circuit breaker type
E2LEM
Circuit breaker frame type
Complete breaker
Magnetic trip range
500-2500A
Terminals
Without terminals
Undervoltage release
120 Vac rear with left pigtail
Frame
L
Class
Mining
Interrupt rating
35 kAIC at 480 Vac 22 kAIC at 250 Vdc 25 kAIC at 600 Vac 65 kAIC at 240 Vac 10 kAIC at 1000Y/577 Vac
Number of poles
Three-pole
Trip rating
500-2500 A
Eaton E2 Series mining service circuit breakers
Eaton E2 Series mining service circuit breakers
Eaton E2 Series mining service circuit breakers
Eaton E2 Series mining service circuit breakers
Circuit Protection, Molded Case Circuit Breakers, Volume 4, Tab 2
MSHA policy letter for suitability, safety and performance of circuit breakers
Robinson Mine Case Study: Solutions for the mining industry
E2 1200 Vac - K, L, and M-Frame mining service breakers and accessories
E2 1200 Vac - K, L, and M-Frame mining service breakers and accessories
E2 1200 Vac - K, L, and M-Frame mining service breakers and accessories
E2 1200 Vac - K, L, and M-Frame mining service breakers and accessories
Understanding circuit breaker design and operation to improve safety and reliability in underground mining
Feature: Three-pole E2LEM L-frame architecture. Business Impact: Delivers robust three-phase protection with a compact footprint, reducing panel space and easing installation in constrained mining enclosures. Application: Suitable for mine panels and junction boxes where space is limited and high fault current events are common. Feature: Magnetic trip option and T205 trip type with interchangeable magnetic trip. Business Impact: Enables fast fault clearance and selective coordination, minimizing collateral equipment damage and downtime. Application: Critical conveyors, crushers, and processing lines in underground mines. Feature: 500-2500 A trip range and 35 kAIC interrupt rating at 480 Vac (plus higher ratings at other voltages). Business Impact: Supports diverse loads and future expansion while preserving protection margins. Application: Heavy-duty motor control and feeder circuits in mining plants. Feature: Voltage ratings 1000Y/577 Vac and 250 Vdc; Undervoltage release 120 Vac rear with left pigtail. Business Impact: Accommodates mixed AC/DC systems and ensures secure control-line coordination. Application: Substations and control panels requiring reliable energization sequencing. Feature: Certifications UL Listed, IEC Rated, CSA Certified. Business Impact: Improves procurement confidence, regulatory compliance, and global interoperability. Application: Global mining projects and supplier qualification processes. Feature: Without terminals; warranty and L-frame mining design. Business Impact: Simplifies integration with pre-wired control circuits and reduces field wiring complexity; warranty coverage provides post-sale support. Application: New installations and retrofits in challenging underground environments.
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FAQs
Yes. The E2LEM3400MWU66 uses an L-frame, three-pole design suited for mining panels and constrained spaces. It is provided as a complete breaker (without terminals) and includes an undervoltage release option (120 Vac rear with left pigtail) to simplify control wiring. For field wiring, reference Eaton’s MCCB accessories and installation guides to ensure proper fit and coordination with existing systems.
Key ratings include 400 A nominal amperage, 1000Y/577 Vac and 250 Vdc voltage ratings, and a 500-2500 A trip range with a T205 trip type. Interrupt ratings reach up to 35 kAIC at 480 Vac, with additional compatibility noted for other voltages. The unit is a three-pole E2LEM, designed to protect heavy mining loads with fast fault clearing.
Yes. The E2LEM3400MWU66 carries UL Listed, IEC Rated, and CSA Certified marks, meeting global safety and interoperability requirements. This certification mix supports procurement across regions and aligns with industry standards for mining equipment protection and regulatory compliance.
Datasheets and service references are available in Eaton’s downloads section, including E2 mining MCCB specifications, 1200 Vac mining service breakers, and 310-ETU comparisons. Access the PDFs to verify trip curves, accessory compatibility, and installation guidelines before ordering or retrofitting in a mining control panel.
The E2LEM3400MWU66 offers predictable protection, fast fault isolation, and regulatory compliance, reducing unplanned downtime and extending equipment life. Its magnetic trip options and wide trip range enable scalable protection for evolving mine loads, while UL/IEC/CSA certifications support global procurement and safer, more reliable power distribution in harsh underground environments.