Overview
The Cefco CRS-R-125 is a Class RK-5 time delay dual element fuse rated for 125 amperes at 600 volts AC. This current-limiting fuse combines fast response to short circuits with deliberate time delay for temporary overloads, making it essential for motor branch circuits, transformer protection, and industrial distribution panels. Dual-element construction allows temporary surges to pass while protecting equipment from persistent fault conditions.
Key Features
- Class RK-5 current-limiting design reduces arc energy and downtime
- Time delay (dual element) tolerates motor inrush while responding to sustained faults
- 600V AC rated for use in standard industrial control and motor circuits
- Meets UL and CSA standards for North American installations
- Compatible with Class RK-5 fuse holders and switch equipment
Technical Specifications
For detailed dimensional and performance data, refer to manufacturer documentation or distributor spec sheets.
Typical Applications
- Three-phase motor branch circuits (125 A maximum)
- Transformer primary and secondary protection
- Industrial control panel feeder circuits
- Machinery spindle and pump motor protection
- Emergency backup and standby generator circuits
Compatibility & Replacements
Compatible With
- Class RK-5 fuse holders and rejection-type switch equipment
- Standard 600V industrial control panels and motor starters
- Motor control circuits up to 125A service rating
- Transformer and feeder protection systems
- North American industrial electrical distribution systems
Replaces / Drop-In Replacement For
- Other Cefco 125A 600V Class RK-5 time delay fuses
- Equivalent 125A 600V dual element fuses from other manufacturers rated for Class RK-5
- Legacy fuse models in similar amperage and voltage ratings
Works With
- UL/CSA-listed rejection-type fuse blocks
- Spring-clip and clip-on cartridge fuse holders
- Panel-mount switch-fuse combinations rated for 125A service
- Motor control centers and industrial disconnect switches
- Legacy and modern industrial electrical systems
