HVR250P120CRAF

Ptc Resettable Fuses Overview

The Littelfuse HVR250P120CRAF is a high-voltage resettable polymer positive temperature coefficient (PTC) fuse designed for radial leaded through-hole mounting. It operates within a voltage range of up to 60V standard and 250V internal, with a maximum current rating of 3A. The device features a hold current (Ih) of 120mA and a trip current (It) of 240mA. Initial resistance is at least 8 Ohms, while post-trip resistance remains below 16 Ohms. It trips in approximately 700ms and functions between -40°C and +85°C.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit protection against short-duration high voltage fault currents by resetting after cooling.
• Designed for high-voltage applications with dual voltage ratings for standard and internal use cases.
• Features radial leaded construction suitable for through-hole PCB mounting.

Ptc Resettable Fuses Applications

• Access equipment protection
• LAN/WAN equipment circuit safeguarding
• High voltage DC power supply input protection

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix 'RAF' against official Littelfuse documentation to confirm exact tape-and-reel packaging or specific variant characteristics, as standard datasheets may list generic radial packages. Ensure the selected component matches the required 60V/250V voltage classification and 120mA hold current specifications for the target application design.

Ptc Resettable Fuses Selection Notes

Select this component when designing circuits requiring resettable overcurrent protection for high-voltage lines where manual fuse replacement is impractical. Consider the 700ms trip time and thermal recovery characteristics to ensure compatibility with system startup transients. Verify that the 16 Ohm maximum post-trip resistance does not interfere with downstream circuit operation during a fault state.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse 250R Series of POLYFUSE resettable PTC devices. The series is engineered specifically to protect sensitive electronics from damage caused by short-duration high voltage fault currents. These components serve as reusable alternatives to traditional one-time fuses in various industrial and telecommunications applications.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes include other Littelfuse 250R series radial parts with matching 120mA hold current and 60V/250V ratings, such as HVR250P120CR. Cross-manufacturer replacements must match the electrical parameters including trip time, resistance, and voltage ratings.