Overview
The Bussmann FRS-R-175 is a Class RK5 Fusetron dual-element, time-delay current-limiting fuse engineered for industrial automation, motor control, and facility protection. With a 175-ampere rating at 600V AC (or 300V DC), this fuse delivers 200 kA interrupting capacity at 600 VAC and 20 kA at 300 VDC, making it suitable for combination starters, motor control centers, machinery disconnects, and power panelboards.
Key Features
- Dual-element construction separates overload and short-circuit protection for optimized circuit coordination
- 10-second minimum time-delay at 500% rated current prevents nuisance tripping on motor inrush
- 2:1 selective coordination ratio within RK5 family minimizes facility shutdowns
- Current-limiting design reduces let-through current and heat stress on equipment
- Non-indicating cartridge body; blade-end terminals for standard rejection holders
- UL-listed Class RK5 rating; approved for use in North American industrial circuits
Technical Specifications
- Amperage: 175 A
- Voltage: 600 VAC / 300 VDC
- Fuse Class: Class RK5
- Interrupting Rating: 200 kA @ 600 VAC; 20 kA @ 300 VDC
- Response Time: 10 seconds (minimum) at 500% rated current
- Body Type: Cartridge (Blade-end x blade-end)
- Physical Size: 1.61 inches diameter × 9.63 inches length
- Element Type: Dual-element, time-delay
- Series: FRS-R (Fusetron)
- UPC: 051712508476
- Country of Origin: Mexico
Typical Applications
The FRS-R-175 is commonly applied in:
- Industrial motor circuits with temporary overload currents and inrush protection requirements
- Combination motor starters and motor control centers
- Machinery disconnects and emergency shut-down circuits
- Power distribution panelboards and facility electrical rooms
- Equipment requiring selective coordination and cascaded protection
Compatibility & Replacements
Compatible With
- Class RK5 fuse holders and rejection-type cartridge bases rated for 600V 175A service
- Motor control circuits sized at 125–150% of motor full-load amperes (FLA)
- Standard North American industrial control panel designs
- Equipment designed to accept dual-element Fusetron protection
Replaces / Drop-In Replacement For
- Other Bussmann FRS-R 175A fuses with identical voltage and class ratings
- General-purpose Class RK5 fuses in existing 175A 600V cartridge holders
- Legacy time-delay fuses in the same electrical category and rating
Works With
- Eaton/Bussmann Fusetron product line and ecosystem
- Standard blade-terminal rejection fuse bases for RK5 class
- Electrical systems requiring 2:1 selective coordination ratio
- Industrial safety standards (UL, NEC, NFPA 70)
