Eaton RKDN400 | 400A NEMA 3R Enclosed Circuit Breaker

Main Description:

The Eaton RKDN400 is a Series C enclosed circuit breaker assembly designed for applications requiring rugged protection and outdoor-rated performance. Built with a NEMA 3R weatherproof enclosure, the RKDN400 provides reliable protection against rain, sleet, and external environmental exposure. Supporting breaker ratings from 125A to 400A, the RKDN400 is compatible with Eaton KD, KDB, HKD, KDC, and DK frame circuit breakers. Its surface-mount design allows easy installation on walls, structures, and panel surfaces, making it ideal for utility, commercial, and industrial electrical distribution systems. Engineered for safety and durability, the enclosure shields operators from accidental contact with live parts while also offering enhanced system integrity in demanding environments.

Technical Overview:

• Brand: Eaton / Cutler-Hammer

• Part Number: RKDN400

• Category: Enclosed Circuit Breaker

• Subcategory: NEMA 3R Outdoor Housing

• Family: Series C

• Type: RKDN Enclosure

• Max Ampacity: 400A

• Voltage Rating: 600V

• Compatible Breaker Types:

  • KD

  • KDB

  • HKD

  • KDC

  • DK

• Mounting Style: Surface Mount

• Enclosure Rating: NEMA 3R (Outdoor)

• Protection: Enclosed mechanical protection for breaker assemblies

• Condition: New/Never Used Surplus

• Weight: 45 lb (20.41 kg)

Key Features:

• NEMA 3R outdoor-rated enclosure

• Supports 125A–400A Series C breakers

• Compatible with multiple breaker frame types

• Protects users from live components

• Weather-resistant, durable construction

• Ideal for commercial, industrial, and utility environments