Overview
The Edison ECSR225 is a Class RK5 current-limiting, time-delay fuse rated for 225 amperes at 600 volts AC. This dual-element design provides reliable overcurrent protection across AC power distribution systems, including mains, feeders, and branch circuits. The ECSR series is engineered specifically for applications subject to surge currents, such as motor circuits and transformer-protected circuits, where selective coordination is essential.
Key Features
- Class RK5 UL-classified dual-element construction for time-delay protection
- Current-limiting design reduces peak let-through current and protects downstream equipment
- Sized close to full-load amperage without nuisance trips during motor inrush
- Provides motor overload, ground-fault, and short-circuit protection
- Knife-blade terminal design for secure installation in standard fuse holders
- Excellent selective coordination within the RK5 fuse family
Technical Specifications
- Amperage Rating: 225A
- Voltage Rating: 600 VAC
- Fuse Class: UL Class RK5
- Type: Dual-Element Time-Delay
- Terminal Style: Knife Blade
- Interrupting Capacity: 200,000A RMS at 600V (typical for RK5 class)
- Connection Type: Blade-to-Blade
- Time Delay Characteristic: 10 seconds at 500% rated current
Typical Applications
- Three-phase motor feeder and branch circuits
- Transformer primary circuit protection
- General power distribution mains and feeders in industrial facilities
- Circuits with inductive loads subject to inrush current
- Equipment protected by soft starters or VFDs
- Commercial and industrial electrical systems rated 600V or less
Compatibility & Replacements
Compatible With
- Standard Class RK5 fuse holders and clips rated 225A+
- AC power distribution panels rated 600V
- Motor control centers and MCC buckets
- Electrical equipment and machinery with 600VAC supply
- Selective coordination circuits using other Class RK5 fuses
Replaces / Drop-In Replacement For
- Older Edison ECSR225 units and equivalent OEM stock
- Generic 225A, 600V Class RK5 time-delay fuses in the same form factor
- Verify compatibility with your system integrator before ordering if replacing legacy equipment
Works With
- Littelfuse FRS-R and Fusetron FRN-R Class RK5 equivalent fuses (cross-reference ratings)
- Bussmann series FRS-R 225A Class RK5 fuses for spare/emergency substitution
- Standard 600VAC three-phase industrial electrical systems
- AC branch circuits, feeders, and main supply lines
