Eaton E2NM312WU66 Mining MCCB - 25 kAIC at 1000 Vac
Part Number: E2NM312WU66
Quick Summary
The Eaton E2 mining complete molded case circuit breaker protects critical underground power circuits. In harsh mining environments, downtime and miscoordination drive costly production losses, so reliable protection is essential. This product line aligns with CE safety conformity and rugged mining-class performance, delivering dependable operation under demanding conditions. For engineers and procurement teams, the combination of robust protection, long-term reliability, and Eaton’s mining-focused support translates into lower maintenance costs, faster commissioning, and safer, more available electrical systems. The E2NM312WU66 is a specialized solution within the broader Electrical Protection & Circuit Control category, offering enhanced protection for mining feeders and motor circuits while simplifying installation and service planning.
Product Information
Extended Description
E2NM312WU66 Eaton: Eaton E2 mining complete molded case circuit breaker, N-frame, E2NM, Electronic LI trip, 1250-5000A trip rating, Three-pole, 1200A, 1000Y/577 Vac, 250 Vdc, 25 kAIC at 1000 Vac, No terminals, Mining, 120 Vac mining rear with left pigtail
Product Name
Eaton E2 mining complete molded case circuit breaker
Catalog Number
E2NM312WU66
UPC
786679059814
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.
Compliances
Contact Manufacturer
Certifications
Contact Manufacturer
Type
Specialty complete
Amperage Rating
1200 A
Voltage rating
1000Y/577 Vac, 250 Vdc
Trip Type
T165
Circuit breaker type
E2NM
Magnetic trip range
1250-5000A
Terminals
Without terminals
Undervoltage release
120 Vac mining rear with left pigtail
Frame
N
Class
Mining
Interrupt rating
25 kAIC at 1000 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
Benchmark tests of factory production vs. third-party reconditioned mining molded case circuit breakers
Benchmark tests of factory production vs. third-party reconditioned mining molded case circuit breakers
Benchmark tests of factory production vs. third-party reconditioned mining molded case circuit breakers
Benchmark tests of factory production vs. third-party reconditioned mining molded case circuit breakers
Understanding circuit breaker design and operation to improve safety and reliability in underground mining
Feature → Business Impact → Application: The E2NM312WU66 uses an N-frame, three-pole construction with an electronic LI trip, delivering precise overcurrent protection for complex mine feeder circuits. This translates to improved selectivity, reduced nuisance trips, and safer shutdown sequences during fault events, which minimizes unplanned downtime on critical mining equipment. In practice, it supports reliable control of underground ventilation and ore handling systems, while reducing maintenance interventions and boosting overall equipment availability. Feature → Business Impact → Application: A 1200 A amperage rating paired with a 1000Y/577 Vac and 250 Vdc voltage capability ensures compatibility with high-energy mining power networks and DC links used in hoisting or conveyor drives, enabling seamless integration with existing switchgear and motor controls. This enables faster, safer commissioning and streamlined changeouts in new or retrofit mining installations. Feature → Business Impact → Application: The 25 kAIC interrupt rating at 1000 Vac provides robust fault-current handling for high-energy mine electrical rooms, delivering dependable short-circuit protection even in high fault scenarios. This reduces arc-flash risk and supports compliance with rigorous safety standards in underground environments. Feature → Business Impact → Application: The unit’s “Undervoltage release” option (120 Vac mining rear with left pigtail) supports remote signaling and coordinated tripping, improving system reliability for remote restart sequences and safe isolation during maintenance or emergencies. This is particularly valuable in multi-panel mining setups where remote control and clear fault indication shorten mean-time-to-repair. Feature → Business Impact → Application: With a three-pole, mining-class frame (N-frame) and a compact 5.5 in depth by 8.25 in height and width footprint, this MCCB fits standard mining MCCB enclosures while simplifying field wiring and panel layout. The absence of terminals on the device itself reduces shipping damage and simplifies handling in tight mine spaces, while compatible accessories and documented data sheets support quick, error-free installation. Feature → Business Impact → Application: The warranty and documented feeder-grade performance (Eaton Selling Policy 25-000) provide a predictable maintenance window and long-term total cost of ownership benefits, helping maintenance teams plan replacements and refurbishments without surprise overhead. This is especially important for underground mine operations where downtime carries a premium. Feature → Business Impact → Application: Access to Eaton’s mining-focused datasheets, service bulletins, and case studies (including MSHA-compliant materials) supports informed decision-making and faster validation during procurement, installation, and commissioning in mining projects. These resources help engineers justify the purchase with tangible ROI in reliability, uptime, and safety.
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FAQs
Begin with a compatible N-frame enclosure and verify panel bus ratings to support 1200 A. Since this model ships without terminals, select appropriate lugs or terminal kits per Eaton recommendations and follow the 3-pole wiring plan to ensure proper phase connection, grounding, and safe isolation during maintenance. Ensure the undervoltage release option is correctly wired if remote signaling is required.
The unit features an electronic LI trip with a magnetic trip range of 1250–5000 A and an interrupt rating of 25 kAIC at 1000 Vac. It is rated for 1200 A and supports 1000Y/577 Vac and 250 Vdc, enabling selective protection in high-energy mining networks and rapid fault isolation to limit damage.
Yes. The E2NM312WU66 is specifically designed for mining applications with N-frame, mining-class classification, and robust overcurrent protection. Its 25 kAIC interrupt capacity and 1200 A rating support demanding underground feeders and motor control circuits while maintaining safety and uptime in harsh environments.
Compliances and certifications for this model are listed by Eaton; refer to the product datasheet and service literature for exact approvals. In mining environments, expect CE-related safety conformity and mining-grade documentation to support regulatory audits. For definitive certifications, consult Eaton’s official materials and the E2NM312WU66 PDF datasheet.
You gain improved system reliability from precise LI protection and a high 25 kAIC fault-current rating, reducing unplanned outages. The compact N-frame design and documented installation support shorten commissioning time, while Eaton’s warranty and service resources help lower lifecycle costs and simplify maintenance planning in challenging underground mines.