Bussmann FRS-R 20 Amp fuse 600V

Bussmann FRS‑R 20 Amp fuse: Reliable time‑delay protection

The Bussmann FRS‑R 20 Amp fuse is a professional-grade Class RK5 cartridge designed to safeguard industrial circuits, motors, and equipment. With a 600 V AC / 300 V DC rating, and built with a dual-element, time-delay design, this fuse allows temporary inrush currents without blowing, ensuring longevity and uninterrupted operation.

Dual-element benefits

This time-delay fuse features a dual-element structure:

• Slow-blow response: Holds for at least 10 seconds at 500 % of rated current—protects against start-up surges without nuisance blowing.

• Current-limiting action: Drastically reduces let-through current in short-circuit conditions, minimizing downstream component damage.

High interrupting ratings

• 600 V AC: rated for interrupting up to 200 kA RMS Symmetrical

• 300 V DC: up to 20 kA DC

These ratings meet or exceed NEC and UL 248‑12 requirements—ideal for modern industrial installations.

Cartridge dimensions

• Length: 5.00 inches (±0.031″)

• Diameter: 0.81 inches (±0.008″)

• Weight: approx. 0.16 lb

Approvals and certifications

• UL listed (UL 248‑12), cULus, CSA C22.2 No. 248.12

• CE marked; Eaton/Bussmann brand, class RK5

Typical applications

• Motor control centers and feeders

• Electrical panels in commercial/industrial facilities

• Protection for HVAC systems and industrial machinery

• Ideal for circuits with high inrush currents

Secure and economical solution

The FRS‑R 20 Amp fuse balances cost savings (preventing nuisance blows) with robust protection. It enables the use of smaller gear and panels while safeguarding equipment from harmful surges.