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Varistors

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A varistor is an electronic component with an electrical resistance that varies with the applied voltage. Varistors are used to protect a circuit from high voltage surges. When a high voltage surge is applied to a circuit, the outcome is usually catastrophic to the circuit. A capacitor may be installed across the signal lines. If you can't find what you are looking for or have large volume requirement, please don't hesitate to contact us.

Varistors: Reliable Surge Protection for Your Electronic Devices

At Evelta, we offer a comprehensive range of varistors for effective circuit protection. Varistors, also known as MOVs (Metal Oxide Varistors), are essential components for safeguarding electronic circuits from transient voltage spikes and surges. Whether used in consumer electronics, industrial equipment, or telecommunications systems, varistors provide critical protection by absorbing excessive energy and clamping voltage to safe levels.

What Are Varistors?

Varistors are non-linear resistors that provide protection against voltage spikes. When the voltage across the varistor remains within the normal operating range, it offers high resistance, allowing minimal current to flow through the device. However, when the voltage exceeds the threshold (known as clamping voltage), the varistor's resistance decreases rapidly, allowing it to absorb the surge and protect the circuit. After the surge passes, the varistor returns to its high-resistance state.

Varistors are commonly used to protect against electrical surges caused by lightning, electrostatic discharge (ESD), and switching operations in electrical circuits. Their ability to absorb and dissipate excessive energy makes them ideal for protecting sensitive electronic components.

Types of Varistors

Varistors come in several types, each offering unique benefits for specific applications:

MOV (Metal Oxide Varistor)

MOVs are the most widely used type of varistors. They are made from zinc oxide and offer excellent energy absorption and transient voltage suppression. MOV varistors are typically found in surge protectors, power strips, and other devices that protect electrical equipment from spikes and surges.

MLCV (Multilayer Chip Varistor)

MLCVs are compact and are commonly used in small, space-constrained applications like mobile devices and wearables. These varistors provide fast response times and are ideal for protecting sensitive components from high-frequency transients.

Key Products in Our Varistor Range

Here are some of the standout varistors available in our catalog:

12V 1nF 0805 Chip Varistor MLCV Ceramic Transient Voltage Suppressor - AVR-M2012C120MT6AB

This compact MLCV varistor is designed to protect low-voltage circuits, such as mobile devices and communication equipment. With a rated voltage of 12V and capacitance of 1nF, it offers excellent protection against ESD and voltage transients in small form-factor applications.

33V 2.5A 1.6nF 7mm Disc Varistor SIOV Lead Radial - B72207S0200K211

The B72207S0200K211 varistor offers strong surge protection for mid-range voltage applications. Its 7mm disc size ensures it can handle surges of up to 2.5A, making it ideal for use in power supplies, motor control systems, and other industrial applications.

21.8V 20% 50nF 6mm Ring Varistor MLCV 3 Electrode Plane Surface - VAR-18060218M3P-FK

This specialized ring varistor features a 6mm form factor and offers high surge absorption in sensitive circuits. With a capacitance of 50nF, it’s designed to protect against voltage spikes in high-performance electronics, including automotive electronics and telecommunications systems.

Benefits of Using Varistors

Using varistors in your circuits offers several key benefits:

  • Surge Suppression: Varistors are designed to absorb and dissipate energy from voltage spikes, protecting sensitive components from damage. Whether it’s an electrical storm or a power surge, varistors ensure your equipment remains unharmed.
  • Compact and Space-Efficient: Varistors, particularly MLCV models, are incredibly compact and fit into the smallest electronic devices without compromising protection. This makes them suitable for mobile devices, wearables, and other compact gadgets.
  • High Energy Absorption: Many varistors can handle high levels of energy, making them ideal for industrial and power supply applications. For instance, MOV varistors can absorb substantial voltage surges while offering continuous protection.
  • Fast Response Time: Varistors react almost instantly to voltage spikes, clamping the voltage to a safe level and preventing damage to the circuit. This fast response is critical in applications where even a small delay in protection could lead to failure.

Trusted Brands: Hel and TDK

At Evelta, we supply varistors from two of the most trusted brands in the industry:

  • Hel: Known for manufacturing durable and high-performance varistors, Hel’s components are designed for industrial and consumer applications where reliability is paramount.
  • TDK: As a global leader in electronic components, TDK offers a wide range of varistors that are recognized for their precision, compact size, and long-lasting protection.

These brands are widely used in both high-end consumer electronics and demanding industrial environments, ensuring you get the best performance and protection.

Applications of Varistors

Varistors are used across various industries and applications. Some common uses include:

  • Surge Protectors: MOV varistors are commonly used in surge protector devices that safeguard home appliances, computers, and audiovisual equipment from voltage spikes.
  • Power Supplies: In power supply systems, varistors provide protection against transients that can cause damage to components like transformers, rectifiers, and capacitors.
  • Telecommunication Equipment: Varistors help protect sensitive telecom devices from surges that can occur during lightning storms or network disruptions.
  • Automotive Electronics: Varistors are used to protect automotive electronics, such as onboard computers and sensors, from voltage surges caused by the car's electrical system.

Why Buy Varistors from Evelta?

Evelta is your go-to source for high-quality varistors at the best prices. When you buy from us, you get:

  • Best Prices in India: We offer competitive pricing on all our varistor products, ensuring you get the best value for your money.
  • Wide Selection: Our inventory includes a variety of varistors for different applications, from compact MLCV varistors to high-energy MOV varistors.
  • Trusted Brands: We stock products only from leading brands like Hel and TDK, known for their reliability and high performance.
  • Buy Online: Our website makes it easy to buy varistors online with detailed product descriptions, datasheets, and fast, reliable shipping across India.
  • Technical Support: Need help choosing the right varistor? Our knowledgeable team is here to provide guidance and ensure you get the ideal component for your application.

How to Choose the Right Varistor

When selecting a varistor for your application, consider the following factors:

  • Voltage Rating: Ensure the varistor can handle the voltage level in your circuit. The clamping voltage should be higher than the circuit’s normal operating voltage but low enough to protect sensitive components.
  • Current Handling: Choose a varistor that can manage the expected surge current. Higher surge ratings are ideal for industrial and power supply applications.
  • Size and Form Factor: For space-constrained designs, MLCV varistors offer a compact solution, while disc varistors are better suited for larger devices and power supplies.
  • Response Time: Fast response times are essential for protecting circuits that operate in high-frequency environments, such as telecom systems or automotive electronics.

Conclusion

At Evelta, we’re committed to providing top-quality varistors for a wide range of applications, from consumer electronics to industrial equipment. With our selection of Hel and TDK varistors, you can be confident that your devices will be well-protected from transient voltage spikes.

Explore our extensive collection of varistors and enjoy the best prices, fast shipping, and top-notch customer support when you buy online from Evelta. Protect your electronics today with the best varistors available in India.