Resettable polyfuse

Switches & protection · PPTC 0.1 – 3 A

Resettable PTC fuse (polyfuse) · hold 0.5 A · Polymer PTC · 30 V · trips near 2× hold current, resets when power is removed

Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.

Typical part: PPTC resettable fuse

Ratings and limits

How to use it

Heats and goes high-resistance on over-current, then resets once the fault is removed and it cools. USB ports and battery packs use them.

Lessons and builds that use it

• TVS, polyfuse and protection front end

More in switches & protection

• Fuse
• Relay
• Toggle switch
• Changeover switch
• Push button
• Wall switch
• AC breaker
• RCD (30 mA)
• DC breaker
• Stop button (NC)