Overview
The Edison ECNR20 is a dual-element, time-delay class RK5 fuse designed for reliable overcurrent protection in industrial and commercial electrical systems. With a voltage rating of 250V AC and 125V DC, and a 20-ampere current rating, the ECNR20 offers current-limiting protection with superior overload and cycling capabilities. The ferrule-end configuration provides secure connections in standard fuse holders, making this fuse ideal for motor circuits, transformer protection, and AC power distribution systems.
Key Features
- Dual-Element, Time-Delay Design: True dual-element construction allows sizing of 125% FLA for motor backup protection, enabling circuit sizing closer to actual load current while maintaining overcurrent protection.
- RK5 Class Current-Limiting: UL Listed, Class RK5, Guide JDDZ, File E162363; CSA Certified, meeting industry standards for performance and safety.
- Extended Time-Delay: Minimum industry standard time-delay of 10 seconds at 5 times the fuse rating (8 sec. minimum for 250V, 30A and less), accommodating normal motor inrush without nuisance trips.
- Ferrule-End Terminals: 0.56 In Diameter, 2 In Overall Length ferrule ends fit standard holders used in industrial control panels and distribution equipment.
- Wide Application Range: Recommended for AC power distribution system mains, feeders and branch circuits having inductive loads (motors, transformers) or non-inductive loads (lighting, heating).
Technical Specifications
- Current Rating: 20 Amperes
- Voltage Rating: 250V AC / 125V DC
- Fuse Class: RK5 (Current-Limiting)
- Type: Dual-Element, Time-Delay
- Terminal Configuration: Ferrule End × Ferrule End
- Time-Delay Response: 8 seconds at 500% of rated current
- Interrupting Rating (AIR): 200 kAIC at 250V
- Diameter: 0.56 In
- Length: 2 In
- Weight per Unit: 0.50 LB
- Package Contents: Box of 10 fuses
Typical Applications
In ratings up to 600A, ECNR/ECSR series fuses are one of the most popular styles used for industrial applications. The ECNR20 is especially suited for:
- Three-phase motor branch circuits
- AC power distribution main feeders and branch circuits
- Transformer protection circuits
- Lighting and heating circuits with inductive loads
- Industrial facilities and machinery control systems
Compatibility & Replacements
Compatible With
- Standard ferrule-end fuse holders (Class RK5 rated)
- AC power distribution panels and switchboards
- Motor control centers (MCC)
- Industrial and commercial electrical systems rated 250V AC / 125V DC
- Eaton/Bussmann fuse holder equipment
Replaces / Drop-In Replacement For
- Bussmann ECNR20 (same manufacturer, same specifications)
- Other Class RK5 20A 250V dual-element time-delay fuses with ferrule-end configuration
- Previous generation Edison ECNR20 units (exact replacement)
Works With
- Ferrule-end fuse holders and clips rated for RK5 class fuses
- Panel-mounted fuse blocks in industrial control enclosures
- UL-listed and CSA-certified equipment designed for Class RK5 fuses
- Motor starters and overload protection relay systems
- Power distribution equipment from Eaton, Square D, GE, and other major manufacturers
