Fuse Tri-Onic® 250V 7A Time-Delay Class RK5 TR Series – Motor Circuit Protection

The Fuse Tri-Onic® 250V 7A Time-Delay Class RK5 TR Series by Mersen is designed for overcurrent protection in motor circuits, mains, feeders, branch circuits, transformers, and service entrance equipment. This current-limiting, time-delay fuse safely handles starting and inrush currents typical of motors and transformers, making it suitable for general-purpose electrical distribution and lighting solutions. It features a clip mounting type and ferrule connection, optimized for reliable installation and operation within switchgear and wire and cable systems.

Specifications

• Amperage Rating: 7 A
• Voltage Rating: 250 V AC
• Interrupt Rating: 200 kA
• Frequency: 50 hertz
• Fuse Class: Class RK5
• Mounting Type: Clip
• Connection: Ferrule
• Dimensions (L x W x H): 2 in x 0.56 in x 0.56 in
• Diameter: 0.56 inches
• Product Weight: 0.0370 lbs
• Insulation Material: PolyTube
• Manufacturer: Mersen
• Manufacturer Part Number: TR7R

Features

• Time-delay characteristic to prevent nuisance opening during motor start-ups and transformer inrush currents
• Current-limiting for low peak let-thru current, enhancing circuit protection
• Rejection-style design to prevent 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 providing dimensional stability in harsh industrial environments
• High-grade silica filler ensures fast arc quenching and high current limitation

Downloads & Links

• Spec Sheet
• Curves
• Drawings