SK72-135 PPTC Fuse 72R135X Alternative for Overcurrent Protection

🔎 SK72-135: A Reliable 72R135X Equivalent

The SK72-135 is designed to provide reliable resettable overcurrent protection for circuits up to 72Vdc maximum voltage, with a maximum 40A short-circuit rating. The series helps protect sensitive electronic components by limiting excessive current during fault conditions and automatically resets after the fault is removed, reducing downtime and maintenance costs.

🔹 SK72-135 Key Electrical Parameters

🔹 SK72-135 Features

• Resettable PPTC fuse providing automatic overcurrent protection
• Rated for up to 72Vdc maximum operating voltage
• 40A maximum short-circuit current capability
• Fast response to overcurrent and short-circuit conditions
• Automatically resets after fault removal, reducing downtime
• Stable performance and high reliability for long-term use

🔹 SK72-135 Outline Drawing

🔹 SK72-135 Typical Applications

• Power supply and DC power distribution circuits
• Battery packs and battery management systems (BMS)
• Industrial control and automation equipment
• Communication and networking devices
• Automotive electronics and auxiliary systems (72Vdc)
• Consumer electronics requiring resettable overcurrent protection

🚀 Why Choose Semiware?

1️⃣ In-House Manufacturing for Cost Efficiency

• Our own production facility allows for stable quality control while optimizing manufacturing costs.
• Ensures consistent supply without relying on external vendors.

2️⃣ Flexible Minimum Order Quantity (MOQ)

• We support adjustable MOQ options to meet both small and large production needs.
• Helps customers reduce inventory pressure and align orders with production schedules.

3️⃣ Volume-Based Pricing and Bulk Orders

• Large-quantity orders can benefit from negotiable pricing to optimize procurement budgets.
• Encourages long-term collaboration with cost advantages for high-volume production.

💡 Tips for Choosing PPTC Resettable Fuse Replacement

When selecting an alternative to PPTC, several factors should be carefully reviewed:

• Hold current and trip characteristics to ensure proper protection behavior
• Voltage rating compatibility for low-voltage circuits
• Radial-leaded package to match existing PCB layouts
• Time-to-trip performance for effective fault response
• Compliance requirements, such as RoHS and lead-free standards
• A suitable alternative should meet these requirements while maintaining stable and repeatable performance.

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.

📩 sales29@semiware.com

❓ FAQs

1.What is PPTC Thermistors?

PPTC Thermistors is 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).