Cooper Bussmann ECNR30 Fuse

The Cooper Bussmann ECNR30 is a high-performance Class RK5 dual-element time-delay fuse engineered for heavy-duty HVACR applications and motor circuits. Rated at 30 Amps and 250VAC, this fuse provides critical overcurrent protection by managing high inrush currents without nuisance tripping. The dual-element design allows for a minimum 10-second time-delay at 500% of the rated current, making it ideal for protecting branch circuits and motors from sustained overloads and short circuits. With a 200kA interrupting rating (IR), it ensures system integrity during major electrical faults. Its rejection-type construction prevents the installation of lower-rated fuses into Class R clips, maintaining the safety and compliance of the electrical panel. Measuring 2 inches in length and 9/16 inches in diameter, this cartridge fuse features high-grade ferrule ends to ensure optimal conductivity and cooler operation, reducing heat-related damage to nearby components.

• Dual-Element Design: Provides superior time-delay characteristics to handle motor startups while offering rapid response to short circuits.
• Enhanced Thermal Management: Engineered to operate at lower temperatures, preserving the lifespan of fuse blocks and disconnect switches.
• Class RK5 Standard: Features a 200,000 Amp interrupting rating to safely clear high-magnitude fault currents in industrial and commercial environments.
• Rejection Capability: Physical dimensions and grooved end caps ensure current-limiting protection by preventing the use of non-rejection fuses.

Can the ECNR30 be used as a substitute for a non-time-delay fuse?
Yes, in motor circuits where inductive loads cause standard fuses to blow during startup, the ECNR30 time-delay fuse is the preferred choice for branch circuit protection.

What is the difference between Class RK5 and RK1 fuses?
While both are current-limiting fuses, Class RK5 fuses like the ECNR30 are standard for most HVAC equipment, whereas RK1 fuses provide a higher degree of current limitation for sensitive electronic components.

Why is my fuse holder showing signs of heat damage?
Heat damage often results from loose connections or using inferior fuses. The Bussmann ECNR series is designed to run cooler, but ensure all fuse clips maintain proper tension to avoid resistive heating.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.