Eaton E2N3900WU66 Mining MCCB - UL Listed CSA Certified
Part Number: E2N3900WU66
Quick Summary
The Eaton E2N3900WU66 is a mining complete MCCB designed to protect underground power systems. In rugged mining environments, engineers struggle with nuisance trips, downtime, and limited on-site maintenance access. UL Listed and CSA Certified marks validate safety and regulatory compliance, while the 900 A rating at 600 Vac with an electronic LSI trip enables precise protection coordination. This model integrates with the Eaton E2 family to streamline spares, service, and procurement, helping reduce lifecycle costs. With mining-specific features such as a rear undervoltage release option and a high interrupt capability, it delivers reliable protection in continuous underground operations.
Product Information
Extended Description
E2N3900WU66 Eaton: Eaton E2 mining complete molded case circuit breaker, N-frame, E2N, Electronic LSI trip, 1250-5000A, Three-pole, 900A, 600 Vac, 65 kAIC at 240 Vac, 50 kAIC at 480 Vac, 25 kAIC at 600 Vac, No term., 120 Vac mining rear w/ left pigtail
Product Name
Eaton E2 mining complete molded case circuit breaker
Catalog Number
E2N3900WU66
UPC
786679060094
Product Length/Depth
5.5 in
Product Height
8.25 in
Product Width
8.25 in
Product Weight
45 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 CSA Certified
Type
Specialty complete
Amperage Rating
900 A
Voltage rating
600 Vac
Trip Type
Electronic LSI
Circuit breaker type
E2N
Magnetic trip range
1250-5000A
Terminals
Without terminals
Undervoltage release
120 Vac mining rear with left pigtail
Frame
N
Class
Mining
Interrupt rating
65 kAIC at 240 Vac 25 kAIC at 600 Vac 50 kAIC at 480 Vac
Number of poles
Three-pole
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
Electronic LSI trip provides fast, precise protection with self-diagnostic checks. Business impact: reduces nuisance tripping and improves fault discrimination between feeders and motors. Application: conveyors and pumps in underground hauls where reliability is critical. The 1250-5000A magnetic trip range supports scalable protection for high-fault conditions in large mining drives, delivering better coordination and faster fault isolation. This translates to reduced equipment damage and safer shutdown sequences in underground equipment. The 900 A amperage rating at 600 Vac, combined with 65 kAIC at 240 Vac, 50 kAIC at 480 Vac, and 25 kAIC at 600 Vac, provides robust short-circuit withstand for mining feeders and motor starters, enabling compliant protection without overtripping. Frame N, three-pole construction, and the undervoltage release option (120 Vac mining rear with left pigtail) simplify installation and control‑panel retrofits. Compatibility with the E2 series minimizes spare parts inventory, while the ability to install without terminals in some configurations reduces field wiring complexity. The Eaton warranty and service policy support predictable maintenance budgets and lower lifecycle costs, which is critical for remote mining sites.
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FAQs
The E2N3900WU66 is a three-pole, N-frame mining MCCB designed for panel mounting in harsh underground environments. It ships without terminals, so field wiring is via compatible terminal kits or lugs as required. Its compact 5.5 inch depth and 8.25 inch width/height dimensions fit standard MCCB enclosures, simplifying retrofit projects and minimizing enclosure changes during upgrades.
The electronic LSI trip delivers fast, accurate protection with self-diagnostic checks, reducing nuisance trips and improving fault discrimination. In mining assets such as conveyors, pumps, and ventilation controls, this translates to fewer unnecessary shutdowns, quicker fault isolation, and improved safety margins for operators and maintenance crews.
Yes. The E2N3900WU66 is part of the E2 mining family and shares frame, trip characteristics, and installation practices with other E2 devices. It supports 3-pole N-frame configurations and integrates with standard Eaton accessories, undervoltage release options, and common control schematics, helping streamline procurement, spares, and repair workflows in mining plants.
The E2N3900WU66 carries UL Listed and CSA Certified marks, confirming compliance with applicable safety and performance standards in North American mining installations. While CE and MSHA-specific letters are not listed here, you can reference Eaton datasheets for any country-specific certifications and ensure alignment with site regulatory requirements during installation planning.
The device’s robust interrupt ratings and electronic trip reduce downtime by preventing nuisance trips and enabling faster fault isolation. With a 900 A rating at 600 Vac and high short-circuit withstand (65 kAIC at 240 Vac, 50 kAIC at 480 Vac, 25 kAIC at 600 Vac), you gain greater protection reliability, lower spare parts needs, and predictable maintenance budgets for remote or underground facilities.