Thermal › Resettable
Resettable Fuses (PPTC / Polyfuse)
PPTC ('polyfuse') devices that limit over-current and auto-reset once they cool — board-level protection for electronics, USB and ports, battery packs and telecom, in through-hole and SMD.
Type: PPTC (resettable)Mounting: THT · SMDReset: Auto (on cooling)
Range
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4 of 4 products
| Product | Mounting | Hold current | Voltage | Package | Datasheet |
|---|---|---|---|---|---|
| PPTC Radial 0.5A TT-PPTC-R050 | Radial (THT) | 0.5 A | 60 V | Radial-lead | — |
| PPTC Radial 1.1A TT-PPTC-R110 | Radial (THT) | 1.1 A | 30 V | Radial-lead | — |
| PPTC SMD 1206 0.5A TT-PPTC-S050 | SMD | 0.5 A | 16 V | 1206 | — |
| PPTC SMD 1812 2.0A TT-PPTC-S200 | SMD | 2.0 A | 6 V | 1812 | — |
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Tenso manufactures resettable PPTC (“polyfuse”) devices for board-level over-current protection in through-hole and SMD packages. A PPTC limits the current when it heats up — from over-current or ambient heat — and resets once it cools, which makes it ideal for nuisance over-currents or sealed, inaccessible boards where a replaceable fuse isn’t practical. Where you need a definite, permanent disconnection instead, use a one-shot thermal cutoff; for a replaceable cartridge fuse on the board, see PCB holders and clips. Ratings are indicative; confirm against the datasheet.
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FAQ
Resettable Fuses (PPTC / Polyfuse) — questions buyers ask
How does a PPTC / polyfuse work?
Its resistance rises sharply when it heats up (from over-current or ambient heat), limiting the current; it resets once it cools.
PPTC or a one-shot fuse?
Use a PPTC where nuisance trips are likely or replacement is impractical (sealed boards). Use a one-shot fuse or thermal cutoff where you need a definite, permanent disconnection.
Where are PPTCs used?
Board-level over-current protection — USB and data ports, battery packs, chargers, telecom and consumer electronics.