Overview
The Bullet ECSR50 is a current-limiting, dual-element time-delay fuse manufactured by Edison Fusegear under the Bullet brand. Rated at 50A, 600V AC, this Class RK5 fuse is designed for circuits subject to surge currents from motors, transformers, and inductive loads. The time-delay feature allows for downsizing fuse amperage ratings closer to full-load current while still protecting against short circuits and ground faults.
Key Features
- Dual-element construction for overload and short-circuit protection
- Time-delay response: 10 seconds at 500% rated current
- Class RK5 current-limiting rating with 200 kA interrupt capacity
- Ferrule terminal connection, cartridge body design
- UL-listed and rejection-type for safety compliance
- Suitable for motor circuits, transformers, and industrial equipment
Technical Specifications
- Amperage Rating: 50A
- Voltage Rating: 600V AC
- Fuse Class: RK5 (current-limiting)
- Fuse Type: Dual-element, time-delay (slow-blow)
- Response Time: 10 seconds at 500% of rated current
- Interrupt Rating: 200 kA
- Body Material: Cartridge (fiberglass)
- Terminal Type: Ferrule x ferrule
- Diameter: 1.06 inches
- Length: 5.5 inches
- Weight: Approximately 1.0–3.1 LB (per quantity)
- Mounting: Fuse holder with ferrule terminals
Typical Applications
The Bullet ECSR50 fuse is commonly used in:
- Motor control circuits and branch circuits
- Industrial machinery and equipment protection
- Transformer primary and secondary circuits
- HVAC and refrigeration systems
- Commercial and industrial electrical panels
- Any AC circuit rated for 600V or less with overcurrent protection requirements
Compatibility & Replacements
Compatible With
- Standard RK5 fuse holders with ferrule terminals
- 600V AC circuits and equipment
- Motor starters and control circuits
- Industrial power distribution systems
- UL-listed electrical enclosures and panels
Replaces / Drop-In Replacement For
The Bullet ECSR50 is a standard ECSR50 fuse and may be interchangeable with equivalent offerings under these part numbers when identical specifications are confirmed:
- Bussmann ECSR50
- Eaton Edison ECSR50
- Reliance ECSR50
- Motors & Armatures 81141 (ECSR50)
Works With
- RK5-compatible fuse holders and reject-type fuseholders
- AC electrical systems rated 600V and below
- Three-phase and single-phase power distribution
- Industrial control and motor protection circuits
