Industry Information

Focus on Varistors for Surge Protection

author：Jarondate：2025-05-26hit：35

According to Transparency Market Research, the global multilayer varistor (MLV) market is projected to grow from USD 500 million in 2024 to over USD 1.1 billion by 2035, at a CAGR of 6.9%. This demand is driven by the widespread adoption of consumer electronics, smart home devices, and renewable energy systems.

Multilayer varistors are especially favored for their compact size and reliable transient voltage suppression, making them ideal for sensitive signal lines and power interfaces.

Material Innovation Pushing Varistor Performance

Emerging materials such as silicon carbide (SiC) and silicon nitride (Si₃N₄) are entering the varistor landscape, offering superior thermal and electrical stability. Research indicates these materials will account for over 35% of market share by 2025, particularly in high-reliability industrial and aerospace applications.

Key Technical Parameters of Varistors

When selecting a varistor for surge protection, the following specifications are essential:

Parameter	Description
Varistor Voltage (V₁ₘₐ)	Voltage at which the device begins conducting (e.g., 470V)
Maximum Allowable Voltage	Continuous working voltage (e.g., AC 300V / DC 385V)
Clamping Voltage (V<sub>C</sub>)	Peak voltage during transient (e.g., 775V)
Peak Current (I<sub>max</sub>)	Maximum surge current handling (e.g., 2500A, 8/20μs waveform)
Energy Absorption	Maximum energy without failure (e.g., 110J)
Response Time	Time to respond to a surge (typically <25 ns)

Popular models include 7D471K, 10D561K, 14D681K

Example Model: 10D471K

Rated for AC: 300V

Varistor Voltage: 470V

Surge Current: 2500A

Energy: 65J

Response Time: <25 ns

This model is well-suited for protecting power entry circuits, HVAC controls, LED drivers, and home appliances.

What’s Driving the Market

Increased voltage instability due to renewable energy integration

Rising demand for compact protection devices in miniaturized electronics

Smart grid and IoT expansion, pushing for more integrated protection solutions

Applications Gaining Traction

Smart meters and home automation systems

Renewable energy converters and inverters

Industrial automation controllers

Consumer appliances (air conditioners, TVs, washing machines)

Conclusion

Varistors offer fast, reliable, and cost-effective protection for modern electronic devices. By choosing the right models such as 10D471K or 14D681K, you ensure long-term safety for your applications.