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Bussmann FRS‑R 300 Amp fuse – Class RK5 time‑delay cartridge rated 300 A, 600 VAC/300 VDC, dual‑element for motor circuits with 200 kA interrupt capacity.
The Bussmann FRS‑R 300 Amp fuse is a robust Class RK5 cartridge fuse engineered for industrial motor protection, heavy-duty feeders, and emergency power systems. Its dual-element, time-delay, current-limiting design provides superior protection by tolerating motor inrush currents while swiftly interrupting dangerous short-circuits.
Dual-element time‑delay: holds for at least 10 seconds at 500% of rated current, minimizing nuisance tripping during motor starts
Current-limiting design: reduces fault current to protect downstream components
600 VAC / 300 VDC voltage rating ensures versatile use
Interrupting rating: 200 kA @ 600 VAC; 20 kA @ 300 VDC
| Feature | Specification |
|---|---|
| Current rating | 300 A |
| Voltage | 600 VAC / 300 VDC |
| Class | RK5 (UL 248‑12) |
| Interrupt rating | 200 kA AC / 20 kA DC |
| Time‑delay | 10 s at 500% load |
| Length | 11.63 in (±0.094″) |
| Diameter | 2.34 in |
| Weight | ~0.40 lb |
| Body | Fiberglass cartridge with blade ends |
Ideal for:
Motor control centers and compressors
High-current feeders in manufacturing
HVAC and industrial refrigeration
Emergency generator circuits
Any system requiring reliable high‑load protection
Use RK5-rated fuse holders (e.g., RM60400 series)
Ensure terminal connections are clean and torqued per holder specs
Use only identical fuse type/rating for replacements
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