The SK30-300 is a polymer PTC resettable fuse with performance comparable to Littelfuse's 30R300U, designed to provide reliable overcurrent protection for low-voltage electronic circuits. It automatically limits overcurrent in the event of a fault and returns to a normal low-resistance state after the fault is cleared, eliminating the need for fuse replacement.Perfect for engineers and procurement teams looking for 30R series compatible PTC protection.
🔹 SK30-300 Key Electrical Parameters
| Parameter | Value |
| Part Number | SK30-300 |
| Package | SK30/30R |
| IHOLD (Max) (A) | 3.0 |
| ITRIP (Min) (A) | 6.0 |
| VMAX (V) | 30 |
| IMAX (A) | 40 |
| Time to Trip Current (A) | 15 |
| Time to Trip Time (s) | 11 |
| RMIN (Ω) | 0.03 |
| RMAX (Ω) | 0.07 |
🔹 SK30-300 Outline Drawing
⭐ Multiple outline drawings are provided to illustrate different lead configurations and mounting options.
🔹 SK30-300 Typical Applications
- USB devices and interfaces
- Mobile phone and tablet chargers
- Power adapters and switching power supplies
- Consumer and portable electronics
❓ Why Choose SK30-300 as a 30R300U Alternative?
For purchasing and engineering professionals, Semiware's SK30-300 offers the following advantages:👇
- Stable and reliable performance
- Produced in our own factory, enabling competitive pricing for our customers.
- Compatible with common 30R series resettable fuses
- Reliable supply and technical support
- Reduced certification risks for alternative components
If you are designing compact circuits or upgrading overcurrent protection, Semiware provides a full range of SMD PTC fuses with stable performance and flexible supply. Detailed datasheets, cross-reference support, and technical guidance are available to help you select the right fuse for your application.
👉 Contact us to request product specifications, samples, or cross-reference recommendations.
❓ FAQs
1.What is a PPTC fuse?
A PPTC fuse is a resettable overcurrent protection device that increases its resistance when excessive current flows and automatically resets after the fault is removed.
2.How does it compare to traditional fuses?
Traditional fuses are single-use and must be replaced after tripping, while PPTC fuses reset automatically and require no maintenance—ideal for consumer and portable electronics.
3.How does a PPTC fuse work?
During overcurrent, the polymer material heats up and expands, sharply increasing resistance to limit current. After cooling, it returns to its low-resistance state, restoring normal operation.
4.What is the difference between PPTC and PTC?
PPTC is a polymer-based PTC device designed specifically for resettable overcurrent protection, while standard PTC components are typically used for temperature sensing or inrush current limiting.
5.What is the difference between NTC and PTC?
NTC resistance decreases as temperature rises (used for sensing and inrush limiting), while PTC resistance increases with temperature (used for protection or heating functions).
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