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Circuit Protection Selection Guide
Consult this guide to learn about circuit protection considerations and the solutions Littelfuse offers. Tables help match products with applications.
Link has been copied to clipboardPolySwitch® Telecom & Line-Rated PPTC Resettable Fuses
PolySwitch® telecom resettable fuses protect telephony and networking equipment from high-voltage fault currents and overcurrent events. These line-rated PPTC fuse devices open circuits during lightning surges, inductive spikes, or power crosses, providing fast, resettable protection. Littelfuse offers reliable polyswitch telecom fuse solutions for communication systems.
- Fast-acting
- Available with ratings from 60 V dc to 250 V dc
- Interrupting ratings of 250 V dc or 600 V dc
- Low resistance ratings (e.g., 4–20 Ω, 6–22 Ω)
- Very low hold current ratings (e.g., 90–180 mA, 100–400 mA)
- UL Recognized
- Certified lead-free and RoHS compliant
- Suitable for use with legacy telephone lines (POTS) and digital telecom systems
- Available in chip, surface mount, and radial leaded configurations
- Available with binned and sorted narrow resistance ranges
- Help users comply with ITU requirements
- Compatible with high-volume electronics assembly
Telecom & Line-Rated Parts
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