Eaton E2NM312MWU66 Mining MCCB - Interchangeable Magnetic
Part Number: E2NM312MWU66
Quick Summary
The Eaton E2 mining complete molded case circuit breaker protects mining circuits by interrupting fault currents in demanding underground environments. This helps address downtime and equipment damage caused by delayed or unreliable fault isolation, a common cost driver in mining operations. For field-readiness, the unit offers rugged protection with an N-frame, three-pole design and 1200 A rating at 1000Y/577 Vac and 250 Vdc, along with a 25 kAIC interrupt rating. It also delivers a 25 kAIC interrupt rating and an interchangeable magnetic trip to tailor protection to specific mining circuit profiles. Note that certifications vary by region; CE and IP standards are commonly relevant, with exact compliance confirmed by the manufacturer. This combination of rugged protection and flexible mounting supports higher uptime, lower maintenance costs, and clearer lifecycle planning for mining operations.
Product Information
Extended Description
E2NM312MWU66 Eaton: Eaton E2 mining complete molded case circuit breaker, N-frame, E2NM, Interchangeable magnetic only trip, 1250-5000A, Three-pole, 1200A, 1000Y/577 Vac, 250 Vdc, 25 kAIC at 1000 Vac, No terminals, Mining, 120 Vac mining rear w/ left pigtail
Product Name
Eaton E2 mining complete molded case circuit breaker
Catalog Number
E2NM312MWU66
UPC
786679059944
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
T205
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
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
The E2NM312MWU66 mining MCCB delivers high-current protection with a 1200 A rating and a three-pole N-frame design, enabling reliable interruption of fault currents in demanding mining installations. This translates to reduced unplanned downtime and longer motor life, essential for conveyors, pumps, and primary distribution in underground mines. The device features an interchangeable magnetic trip with a 1250–5000 A range and a 25 kAIC interrupt capacity at 1000 Vac, allowing precise tailoring to circuit fault levels and improving selectivity between upstream protections and downstream loads. Voltage versatility includes 1000Y/577 Vac and 250 Vdc, supporting mixed AC-DC mining systems and facilitating cross-application reuse. Undervoltage release is provided via a 120 Vac mining rear with left pigtail, enabling remote tripping and safer shutdown sequences. Without terminals, installers can match field-terminals to site wiring, simplifying integration with existing enclosures and bus systems. Weighing 45 lb, the fixed frame N design offers rugged durability and predictable mounting in harsh mining environments, while the one-year warranty under Eaton’s policy helps manage lifecycle cost. In practice, this MCCB supports compliant protection schemes for mining equipment, aligns with maintenance workflows, and reduces total cost of ownership through standardized Eaton components and service networks.
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FAQs
The E2NM312MWU66 is specified without terminals. Field-terminated terminals must be added to match your wiring scheme, enclosure spacing, and bus connections. This design choice supports site-specific terminal types and simplifies integration into customized mining panels.
The MCCB is rated for 1200 A continuous current, with a voltage rating of 1000Y/577 Vac and 250 Vdc. It provides a 25 kAIC interrupt capacity at 1000 Vac, and uses a three-pole N-frame configuration suitable for mining applications.
Yes. Its mining class, N-frame, three-pole design, 1200 A rating, and 25 kAIC interrupt capability are tailored for rugged mining environments. Features such as interchangeable magnetic trip and undervoltage release (120 Vac rear with left pigtail) enable precise protection strategies and safe remote actuation in underground facilities.
Plan for a terminal-matching step since the device ships without terminals. Note the overall dimensions (approximately 5.5 in depth, 8.25 in height, and 8.25 in width) and a weight around 45 lb. The unit’s 120 Vac mining rear with left pigtail supports remote tripping, and the N-frame, three-pole configuration facilitates straightforward mounting within mining switchgear or distribution panels.
Download the E2NM312MWU66 datasheet and related literature from Eaton’s site. Key assets include the data sheet for E2 mining MCCBs, mining-specific safety letters, and mining case studies. You can access brochures, catalogs, and technical papers via the provided Eaton links in the product resources section.