Bussmann FRN-R 30A 250V Fusetron Dual-Element Time-Delay RK5 Cartridge Fuse

Overview

The Bussmann FRN-R fuse is a heavy duty time-delay solution designed to guard motors and related circuits in demanding environments. Built with a brass body and a fiberglass tube, this cartridge fuse blends robust protection with reliable performance, helping to manage startup surges and longer overloads without prematurely interrupting operation.

This part carries UL Listing and CSA Certification, signaling adherence to recognized safety standards. Classified as RK5, it offers current limiting features that help maintain safe current levels during fault conditions. The dual-element design is purposefully tuned to permit short startup bursts typical of motors, while opening quickly during extended overloads or short circuits.

Key Benefits at a Glance

• Time-delay protection to accommodate motor startups without sacrificing long-term safeguards.
• Dual-element construction provides layered protection against overloads and short circuits.
• Current limiting with Class RK5 designation supports selective coordination in complex panels.
• UL Listed and CSA Certified for reliability and compliance.
• End cap grooves enable compatibility with Class H, Class K, or Class R fuse blocks.

Applications and Real-World Use

• Ideal for motor control centers, power panelboards, and combination starters where higher amps or voltages are needed.
• Useful in industrial, commercial, and agricultural settings, including equipment like pumps, air conditioning systems, and industrial machinery.
• Supports selective coordination to help minimize blackout risk in multi-zone setups.

How It Works

The dual-element design opens in as little as 0.004 seconds under short-circuit conditions, while the time-delay feature allows initial startup surges to pass. When a longer, dangerous overload occurs, the fuse interrupts to protect connected equipment.

Specifications and What's Included

• Current rating: 30 A
• Voltage rating: 250 VAC
• Class RK5, current limiting
• UL Listed, CSA Certified
• Construction: fiberglass tube, brass end caps
• Includes: 1 FRN-R-30A cartridge fuse

Designed to fit in power panels, motor control centers, and machinery disconnects, this fuse supports robust motor protection without forcing frequent replacements.