Littelfuse PolySwitch RXEF Resettable Fuse, PPTC, 72V DC, 750mA

The Littelfuse PolySwitch RXEF Resettable Fuse is a PPTC (Polymeric Positive Temperature Coefficient) device designed for reliable overcurrent protection in a wide range of electronic applications. This radial-leaded device automatically resets after a fault condition is cleared, eliminating the need for manual replacement and reducing maintenance costs. It is constructed with a cured, flame-retardant epoxy polymer insulation that meets the stringent UL 94V-0 flammability standard, ensuring safety and durability in demanding environments.

With a voltage rating of 72V DC, it features a 750mA holding current and a 1.5A trip current. It offers robust protection with a maximum fault current rating of 40A and a typical time to trip of 6.3 seconds. The device operates reliably across an extensive temperature range from -40°C to 85°C, making it suitable for both industrial and consumer electronics exposed to harsh conditions.

Typical Applications

This versatile fuse is commonly used in:

• Satellite video receivers
• Industrial control systems
• Transformers and power supplies
• Computer motherboards and peripherals
• Modems, USB hubs, and IEEE 1394 ports
• CD-ROM drives and gaming consoles
• Battery packs and mobile phones
• Fax machines, printers, and line cards

Certifications and Compliance

The RXEF series is designed for high-volume electronics assembly and carries major international approvals, providing confidence in its quality and safety. It is UL recognised to UL 1434, CSA approved, TUV approved to EN 60730-1, and CQC approved to relevant GB standards.

Its compact, round form factor (10.2mm diameter, 15.2mm height) with a 5.8mm lead spacing facilitates easy integration into circuit designs. By choosing the Littelfuse PolySwitch RXEF, you select a component that combines automatic reset functionality, proven reliability, and global regulatory complia