Best Varistors of 2025
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Varistors are essential components in electronic circuits used to protect against voltage surges and spikes. These industrial and scientific devices are designed to shunt excess current and limit the voltage to a safe level, preventing damage to sensitive electronic equipment. Varistors are commonly used in power supplies, surge protectors, and other applications where voltage regulation is critical. These devices are available in a range of sizes and specifications to suit different applications, making them a versatile solution for any electronic circuit that requires protection against voltage fluctuations.
At a Glance: Our Top Picks
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Top 10 Varistors
uxcell 10D271K Varistors
Introducing the uxcell 10D271K Varistors, a set of 10 voltage dependent resistors designed to protect your equipment against transient voltage spikes. With a maximum allowable voltage of AC 175V and DC 225V, these varistors provide reliable protection for your devices. The varistor voltage of 270V ±10% ensures that any voltage spikes are efficiently absorbed, safeguarding your equipment. Featuring a specific epoxy coated disc construction with radial leads, these varistors offer a long life span. The straight lead design with a size of 24 x 0.7mm and lead spacing of 7.5mm makes for easy installation. Trust the uxcell 10D271K Varistors to keep your equipment safe and secure.
Epcos S20K275 Varistors
The Epcos S20K275 Varistors come in a package of 10 pieces with a 20mm disk and 10mm lead spacing. With a 275Vac 350Vdc 630pF capacity and 215J 710V clamp, these varistors are effective in protecting your devices from overvoltage. They fall under the category of varistors.
uxcell 30Pcs Voltage Dependent Resistors
The uxcell Voltage Dependent Resistors come in a pack of 30 with a maximum allowable AC voltage of 300V and a varistor voltage of 470V. Its specific epoxy coated disc construction with radial leads makes it durable for long term use. With a maximum clamping voltage of 775V and clamping current of 25A, it is designed to protect equipment against transient voltage spikes.
uxcell 7D241K Varistors
The uxcell Varistors are designed to protect your electronic equipment from dangerous voltage spikes. With a maximum allowable voltage of AC 150V and DC 200V, these varistors help safeguard your devices from damage. Their clamping voltage of 395V ensures that transient surges are effectively managed, giving you peace of mind. The specific epoxy-coated disc construction offers durability, allowing for long-term use. Plus, the straight leads with a spacing of 5.08mm make installation straightforward and convenient for users.
KOKISO Varistor Resistors Kit Assortment
The KOKISO Varistor 15 Values 150 PCS Voltage Dependent Resistors Kit Assortment includes 15 commonly used voltage and resistance values, such as 120V, 240V, 270V, 330V, 390V, and 470V. Each model comes with a small bag and a mark, and the box is also marked with the model for easy identification. The high-quality box provided makes it easy to manage and store the kit.
uxcell Varistors 10D271K
uxcell Varistors 10D271K are voltage-dependent resistors designed to protect equipment from voltage spikes. With a max allowable voltage of AC 175V and DC 225V, these varistors have a varistor voltage of 270V ±10%. The max clamping voltage of 455V and max clamping current of 25A ensure reliable protection. The specific epoxy coated disc construction with radial leads ensures durability and long-term use. The straight lead type with a lead size of 24 x 0.7mm and lead spacing of 7.5mm make installation convenient for safeguarding your equipment.
COMPSTUDIO 150Pcs Varistor Resistance Kit
The COMPSTUDIO Varistor Resistance Kit includes 150 voltage-dependent resistors, designed to safeguard your equipment from sudden voltage spikes. Each resistor has a voltage rating of 470V, ensuring reliable performance in various applications. Made from durable epoxy and zinc oxide, these resistors are built to last, providing long-term protection for your devices. With a specific epoxy-coated disc construction and radial leads, they offer ease of installation and enhanced stability in your electronic projects.
Fielect 10Pcs Varistors
Fielect 10Pcs Varistors are voltage-dependent resistors widely used in various small electronic devices. With a maximum impulse current of 4500A and a rated power of 0.6W, these varistors provide excellent protection against voltage spikes. The ZnO film and epoxy resin coated disc structure ensure a long service life, making them durable and reliable. The high working voltage and stability of these varistors make them ideal for applications such as resonance, coupling, filtering, and bypass in electronic precision instruments. With their compact structure and excellent moisture resistance, Fielect Varistors offer high-capacity capacitors that can withstand high temperatures. Upgrade your electronic devices with these varistors and enjoy enhanced performance and protection.
Littelfuse V130LA20AP Varistor
The Littelfuse V130LA20AP Varistor comes in a pack of 12 and is a red-colored varistor that falls under the varistors category.
uxcell 20Pcs 7D241K Varistors
The uxcell Varistors 7D241K are designed to safeguard your equipment from sudden voltage spikes. With a maximum allowable voltage of 150V AC and 200V DC, these varistors ensure reliable protection. The clamping voltage of 395V means they effectively manage surges, while the clamping current of up to 10A provides robust support. Their durable epoxy-coated disc construction with straight radial leads ensures a long lifespan, giving you peace of mind that your devices remain protected over time.
Frequently Asked Questions (FAQs)
1. What are varistors used for?
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.
2. What is the working principle of varistor?
A varistor does not obey Ohm's law and hence it is not like an ohmic resistor. It is basically a non-ohmic resistor that does not follow Ohm's law and hence it is also called a non-linear resistor or a voltage-dependent resistor.
3. What happens when varistor fails?
Under different current conditions, failure modes include electrical puncture (see Figure 4), physical cracking (see Figure 5), and thermal runaway. Cracking happens because varistors are basically a ceramic material, and hitting them with a sharp high-amplitude surge is like hitting a dinner plate with a hammer.
During our varistor research, we found 24 varistor products and shortlisted 10 quality products. We collected and analyzed 2,744 customer reviews through our big data system to write the varistors list. We found that most customers choose varistors with an average price of $7.03.
The varistors are available for purchase. We have researched hundreds of brands and picked the top brands of varistors, including uxcell, Epcos, KOKISO, COMPSTUDIO, Fielect. The seller of top 1 product has received honest feedback from 18,472 consumers with an average rating of 4.8.
Brian Howie is a content writer and senior industrial designer. After graduation from Westminster College, he has been engaged in product design and manufacturing for 18 years. Brian Howie has always found great pleasure in designing industrial products and sharing his ideas and experience online.