Fuses & Circuit Protection Components Buying Guide

Circuit protection components prevent damage from overcurrent and overvoltage. This guide covers selection and sourcing.

By Vigny (深圳市华芯购电子有限公司) · Published 2026-09-27 · Data verified 2026-09-29 · Sources: manufacturer datasheets & HuaXinGou stock verification

Protection Categories

Fuses (overcurrent), PTC resettable fuses, TVS diodes (transient voltage), ESD suppressors, varistors (MOV) and gas discharge tubes.

Rated current/voltage, breaking capacity, trip time curve, clamping voltage, peak pulse power and package.

Place protection at input connectors, power rails and sensitive ICs. Match TVS stand-off voltage above the normal rail and clamp below the IC limit.

Littelfuse, Bourns, Vishay, ST and domestic makers supply protection parts broadly. HuaXinGou sources fuses/TVS/ESD with ratings verified.

Paste your part list below — our team verifies stock, date codes and alternates, then replies with a consolidated quote. Call/WeChat also available.

What is the difference between fuse and PTC?

A fuse opens permanently; a PTC resets after cooling, suited for temporary faults.

What is TVS clamping voltage?

The voltage the TVS limits the transient to; it must stay below the protected circuit's maximum rating.

Where should protection go?

At power inputs, USB/connector lines, and on exposed signal lines subject to ESD.