Overview
The Bullet ECNR400 is a Class RK5 dual element, time-delay fuse engineered for industrial and commercial power distribution. With a 400A amperage rating at 250V, this fuse delivers current-limiting protection while accommodating normal inrush currents typical of motor and transformer circuits. The ECNR400 combines reliable overcurrent protection with time-delay characteristics, making it ideal for systems where temporary overloads from starting equipment must be tolerated.
Key Features
- Dual element construction with 10-second minimum time-delay at 5× fuse rating
- Class RK5 current-limiting technology for superior short-circuit protection
- UL-rated for 200,000 RMS symmetrical amperes interrupting capacity
- Sized to reduce unnecessary fuse openings from equipment surges
- Optimized for inductive loads (motors, transformers) and non-inductive loads (lighting, heating)
Technical Specifications
- Amperage Rating: 400A
- Voltage Rating: 250V AC
- Fuse Class: RK5
- Type: Dual Element, Time Delay
- Time-Delay Characteristic: Minimum 10 seconds at 5× rating
- Interrupting Rating: 200,000 RMS symmetrical amperes
- Construction: Knife blade cartridge
- Part Number: ECNR400
- Manufacturer: Bullet (Edison)
Typical Applications
The Bullet ECNR400 is recommended for AC power distribution system mains, feeders, and branch circuits. Common installations include:
- Motor branch circuits and main feeders
- Transformer protection in distribution panels
- Industrial machinery control systems
- Commercial power distribution where short-circuit current does not exceed 200,000 RMS amperes
Compatibility & Replacements
Compatible With
- Standard RK5 fuse holders and knife-blade cartridge receptacles
- AC power distribution systems rated 250V and below
- Industrial control panels and electrical enclosures
- Equipment designed for 400A Class RK5 fuse protection
Replaces / Drop-In Replacement For
- Edison ECNR400
- FPE Econ ECNR400
- Other OEM equivalents rated 400A, 250V, Class RK5
Works With
- RK5 class fuse clips and holders
- 250V AC industrial power systems
- Knife-blade fuse cartridge enclosures
- Motor starter and transformer protection circuits
