Fuse Tri-Onic® 250V 4A Time-Delay Class RK5 TR Series – Electrical Overcurrent Protection

The Fuse Tri-Onic® 250V 4A Time-Delay Class RK5 TR Series by Mersen is designed for reliable overcurrent protection in motor circuits, mains feeders, branch circuits, transformers, and service entrance equipment. This time-delay fuse safely handles motor start-up and transformer inrush currents without nuisance openings, making it suitable for a variety of industrial electrical applications. It is a key component for electrical distributors and switchgear suppliers seeking robust protection solutions for wire and cable systems and lighting solutions.

Specifications

• Manufacturer: Mersen
• Manufacturer Part #: TR4R
• Class: Class RK5
• Voltage Rating: 250V AC
• Amperage Rating: 4 A
• Interrupt Rating: 200 kA
• Frequency: 50 hertz
• Mounting Type: Clip
• Connection: Ferrule
• Insulation Material: PolyTube
• Dimensions: Length 2 in, Diameter 0.56 in, Width 0.56 in, Height 0.56 in
• Product Weight: 0.0370 lbs

Features

• Time-delay characteristic for handling harmless motor starting and transformer inrush currents
• Current-limiting design reduces peak let-thru current
• AC and DC rated for versatile application
• Rejection-style design prevents replacement errors when used with recommended fuse blocks
• Easy-to-read label for quick brand recognition and replacement
• Metal-embossed date and catalog number for traceability and lasting identification
• Fiberglass body provides dimensional stability in harsh industrial environments
• High-grade silica filler ensures fast arc quenching and high current limitation

Downloads & Links

• Spec Sheet
• Curves
• Drawings