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 clipboardTelecom & Line-Rated
PolySwitch® telecom resettable PPTCs protect telephony and networking equipment from damage due to short-lived high-voltage fault currents. As resettable fuses, the polymer positive temperature coefficient devices also provide overcurrent protection. One example of what these PPTCs do is open circuits after lightning strikes causes massive overvoltage events. The resettable fuses also respond quickly to surges of inductive current and to power crosses when T1 lines contact ac power lines.
- 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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