Auto Reset Fuse Selection with YINT PPTC Models

Product options for recoverable overcurrent protection

An auto reset fuse limits sustained overcurrent and recovers after the fault is removed and the device cools. This makes a polymeric positive temperature coefficient fuse useful in equipment where replacing a one-time fuse after every temporary fault would be inconvenient.

YINT Electronics supplies through-hole and surface-mount PPTC devices for power branches, battery equipment, motor circuits and communication products. The models below show how current, voltage and package choices change across the YINT range.

YINT model guide Choose the model from the normal current voltage limit fault level and installation method

Why Product Designers Use an Auto Reset Fuse

A PPTC stays at relatively low resistance during normal operation. A sustained overload heats the polymer element and raises its resistance, reducing current through the protected branch. Once power is removed or the fault clears, cooling allows the device to recover. This behavior supports sealed products, remote equipment and frequently used ports that need recoverable protection.

The device remains a current limiter rather than a mechanical disconnect. A small current normally continues while it is tripped. Designs that require complete isolation should use a suitable switch or safety fuse in addition to the PPTC.

YINT Models for Different Electrical Windows

YINT part numbers state useful selection information, but the complete ratings should always be read together. The 72V-250 emphasizes voltage headroom, the 60V-300 provides a 3 A hold option, the 30V-500 raises the trip rating to 10 A, and the SMD1812L-800-6V serves compact high-current low-voltage boards.

These products are not interchangeable. Their voltage ceilings, current ratings and mounting formats lead to different application roles.

Match the Model to the Application

For nominal 24 V control equipment, 60V-300 and 72V-250 provide useful voltage headroom when the measured surge environment remains within the selected rating. The 60V-300 is the closer match when the load requires a 3 A hold rating; 72V-250 suits lower continuous current with a higher maximum voltage.

For a power branch whose normal current is within 5 A and whose desired PPTC trip rating is 10 A, 30V-500 is the relevant through-hole candidate. SMD1812L-800-6V addresses a different need: compact 6 V systems that require an 8 A hold and 16 A trip profile.

Use PPTC with the Right Protection Components

A PPTC responds to overcurrent and temperature. It does not replace a TVS diode used to clamp a fast voltage spike, or a TSS used to divert a communication-line surge. A product may use a PPTC in series with the supply and a separate transient protector at the connector. The combination should be coordinated so the voltage protector can conduct safely while the PPTC limits longer fault current.

Motor and capacitive loads also require an inrush check. A short valid peak may be much higher than the steady current, so the time-to-trip curve is more useful than a simple ampere label.

Product Selection Summary

Information Needed for a YINT Recommendation

Send the operating voltage, highest continuous current, peak-current waveform, available short-circuit current, ambient temperature and package preference. YINT can then compare the required hold current with temperature derating and check the trip curve against the actual fault.

A final sample test should reproduce the product enclosure, PCB copper, power source and worst-case load. This confirms voltage drop, nuisance-trip margin, fault response and recovery before volume purchasing.

FAQ

1. Which YINT model is suitable for a 3 A continuous load?

YINT 60V-300 is the direct catalog starting point because its published hold current is 3.00 A. Apply temperature derating before confirming the choice.

2. Which model has a 10 A trip rating?

YINT 30V-500 combines a 5.00 A hold rating with a 10.00 A trip rating and a 30 V maximum voltage.

3. Does YINT offer a surface-mount high-current PPTC?

SMD1812L-800-6V is an 1812 surface-mount option rated for 8.00 A hold and 16.00 A trip on circuits up to 6 V.

4. What is the role of 72V-250?

It provides a 2.50 A hold rating and 72 V maximum voltage for designs that value higher voltage headroom more than a 3 A hold rating.

5. Can the same PPTC be used in every ambient temperature?

The part can operate across its specified range, but available hold current changes with temperature. Use the published derating data for the hottest operating condition.

6. How can I request a YINT sample?

Provide the circuit voltage, load profile, fault current, temperature and preferred package to YINT Electronics for a focused recommendation and sample request.

Conclusion

YINT offers distinct auto reset fuse choices rather than a single universal part. Use 72V-250 for higher voltage margin at 2.5 A hold, 60V-300 for a 3 A hold requirement, 30V-500 for a 10 A trip target, and SMD1812L-800-6V for compact 6 V high-current boards. The application data determines which model should move to sample testing.

Product links: PPTC portfolio. For selection, samples or a quotation, contact YINT Electronics or email global@yint.com.cn.