Eaton Cutler Hammer Mining E2NM3900WU66 900A 3 Pole Molded Case Mining Circuit Breaker – Bolt-On Mount – 1000VAC

The Eaton E2NM3900WU66 is a high-capacity molded case mining circuit breaker engineered for demanding industrial and mining applications. Built on the durable N-frame platform, it features a non-interchangeable thermal-magnetic trip unit that provides reliable protection against overloads and short circuits. With a 900-ampere rating and support for up to 1000VAC, this breaker ensures dependable performance in heavy-duty power distribution systems. The U66 configuration includes a 120VAC undervoltage release (UVR) with LED indicator, left pole mounting, and rear exit, offering enhanced monitoring, visibility, and controlled operation.

Product Specifications

• Frame Style: E2NM (N Frame)
• Breaker Type: Molded Case Mining Circuit Breaker
• Trip Unit Type: Non-Interchangeable Thermal-Magnetic
• Amperage Rating: 900 Ampere
• Number of Poles: 3 Pole
• Mounting Type: Bolt-On
• Frequency: 50/60 Hz
• Application: Mining and heavy industrial power distribution

Technical Specifications

• Trip Mechanism: Thermal-Magnetic
• Trip Setting Range: 1250–5000 Amps
• Interrupting Capacity Class: High Interrupting Capacity
• Construction Type: Molded Case
• Operating Temperature: Rated at 40°C
• Special Features:
  • U66 Option: 120VAC Undervoltage Release (UVR) Installed
  • LED Indicator Included
  • Left Pole Mounted
  • Rear Exit Connection

Voltage and Ratings

• Rated Voltage (AC): Up to 1000VAC
• Frequency: 50/60 Hz
• Interrupting Rating @ 480VAC: 50 kA
• Interrupting Rating @ 600VAC: 25 kA
• Interrupting Rating @ 1000VAC: 25 kA

Product Data

• Model Number: E2NM3900WU66
• Manufacturer: Eaton / Cutler Hammer
• Series: E2NM
• Frame Type: N Frame
• Connection Type: Bolt-On
• Configuration: U66 (UVR with LED, Left Pole Mounted, Rear Exit)
• Warranty: 1 Year
• Condition: New / Manufacturer Standard
• Availability: Subject to stock

Important Note

The product image represents a base model for identification purposes only. Accessories ordered with the breaker, such as undervoltage release modules with LED indicators, can be factory-installed at no additional cost—ensure all configuration details are included in the order comment box. Always verify system compatibility and consult technical documentation or a qualified professional before installation.

Returns are easy

You may return items within 10 days of delivery for a refund.

FREE Shipping on orders over $149.

My Circuit Breakers offers one to five day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s).

Same Day Shipping

We strive to ship out your items within one business day.

In rare circumstances, My Circuit Breakers may reserve up to 5 business days to complete shipment. Feel free to contact us if your order is time sensitive.

My Circuit Breakers provides a comprehensive 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer). Extended warranties are available upon request.