250R120-RCZR

Ptc Resettable Fuses Overview

The Littelfuse 250R120-RCZR is a resettable polymeric positive temperature coefficient (PPTC) device from the 250R Series, designed for radial leaded through-hole mounting. It provides circuit protection against short-duration high voltage fault currents and overcurrent conditions. The component features a holding current of 120 mA and a trip current of 240 mA, with a maximum operating voltage of 60 VDC. It has a rated current capacity of 3 A and an initial resistance of 16 Ohms. The device operates within a temperature range of -40°C to +85°C.

Ptc Resettable Fuses Feature Summary

• Provides automatic resettable protection against overcurrent and short-duration high voltage faults
• Features sensitive gate characteristics allowing direct interfacing with microprocessors
• Utilizes glass passivated junctions to ensure durability in demanding environments
• Compatible with lead-free reflow soldering processes for modern assembly requirements

Ptc Resettable Fuses Applications

• Access equipment protection
• LAN/WAN equipment circuit safeguarding
• Low-current switching circuits requiring precise control

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix RCZR against official Littelfuse documentation to confirm exact tape-and-reel packaging or specific environmental compliance variations compared to standard bulk versions. Ensure the procurement specification matches the required radial lead configuration and voltage rating for the target application design.

Ptc Resettable Fuses Selection Notes

Select this component when designing circuits that require automatic recovery after fault clearance without manual fuse replacement. Consider the 120 mA holding current and 60 VDC maximum voltage limits to ensure compatibility with the protected load. Evaluate thermal management requirements given the -40°C to +85°C operating range and the need for adequate spacing during reflow soldering.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse 250R Series of POLYFUSE resettable PTCs. The series is engineered specifically for protecting sensitive electronics against transient overcurrent events. As a radial leaded device, it is suited for through-hole PCB applications where robust mechanical anchoring and automated insertion are preferred over surface mount alternatives.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes include other Littelfuse 250R Series variants with matching 120 mA holding current and 60 VDC ratings, such as the 250R120. Verify package style and lead spacing compatibility before substitution.