Overview
The Cefco CRS-R125 is a Class RK-5 dual-element time-delay cartridge fuse designed for industrial power distribution and motor branch circuits. With a 125A current rating and 600V voltage rating, this fuse provides dependable overcurrent protection while allowing temporary inrush currents typical of motor starting. The dual-element design combines a fuse element that responds to sustained overloads with a second element sensitive to short circuits, enabling precise coordination with upstream and downstream protective devices.
Key Features
- Class RK-5 classification for motor branch circuit protection
- Dual-element construction for time-delay response to motor inrush
- Rated 125A at 600VAC / 300VDC
- Cartridge style with rejection design for proper socket fit
- Current-limiting characteristics to reduce fault current stress on equipment
- 10-second minimum response time at 500% of rated current
Technical Specifications
- Current Rating: 125A
- Voltage Rating: 600VAC / 300VDC
- Class: RK-5 (current-limiting, time-delay)
- Element Type: Dual-element
- Response Time: 10 seconds minimum at 500% rated current
- Terminal Type: Cartridge blade terminal
- Mounting Style: Holder mount (cartridge type)
Typical Applications
- Motor branch circuits and feeder protection in industrial plants
- Equipment protection in manufacturing and processing facilities
- Commercial HVAC systems and pump motors requiring inrush tolerance
- Machinery control panels and distribution boxes
- General-purpose industrial power distribution up to 600V
Compatibility & Replacements
Compatible With
- Standard Class RK-5 fuse holders and rejection sockets rated for 125A 600V
- Motor control circuits and branch circuit protection schemes
- Industrial electrical distribution systems and panelboards
- Coordination with Class RK-5 compatible overcurrent devices
Replaces / Drop-In Replacement For
- Other Class RK-5 125A 600V dual-element time-delay fuses with equivalent interrupting ratings
- Verify compatibility with your system integrator before ordering to ensure identical form factor and interrupting rating specifications.
Works With
- UL-listed motor branch circuit applications per NEC Article 430
- Fusible disconnect switches rated for Class RK-5
- Industrial control systems and machinery protection circuits
- Standard three-phase and single-phase motor starter combinations
