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Metal Oxide Varistors

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Metal Oxide Varistors Specification

IP Rating
IP20 (unsealed, for indoor use only)

Power Source
Not applicable (passive device)

Interface
2 terminal, radial leads

Power Supply
Not required (Passive component)

Operating Temperature
-40C to +85C

Thermal Conductivity
Approx. 1.4 W/mK

Response Time
< 25 ns (nano seconds)

Output
Surge-suppressed voltage

Components
Zinc oxide granules in a ceramic matrix with silver electrodes

Features
Fast response, high energy absorption, stable performance, flame retardant body

Usage
Electrical and electronic circuit protection

Input
AC/DC voltage

Product Type
Metal Oxide Varistor (MOV)

Application
Surge protection for power supplies, electronics, telecommunications, industrial equipment

Rated Voltage
18V to 1000V (varies by model)

Supply Voltage
Up to 1000V (depending on varistor model)

Size
7mm, 10mm, 14mm, 20mm (disk diameter)

Dimension (L*W*H)
Varies by model, e.g. 12x8x3 mm

Function
Overvoltage protection

Color
Blue

Weight
Approximately 2 5 grams (varies with size)

Capacity
Surge current handling 1kA to 10kA

Thickness
1.5 mm 6 mm (depending on model)

Current Rating
Max. surge current up to 6500A (model dependent)

Frequency
50Hz to 60Hz (typical in power lines)

Mounting Type
Through-hole

Dielectric Strength
2kV AC (1 minute)

Terminal Type
Radial leads, tin-plated copper wire

Energy Absorption (Joule Rating)
10J to 430J depending on size and model

Standards Compliance
UL, IEC61051, RoHS

Body Material
Epoxy-coated ceramic

Insulation Resistance
>1000 M (at 500V DC)

Storage Temperature
-40C to +125C

Clamping Voltage
Varies by part, typically 1.5x rated voltage

Leakage Current
<20 A at rated voltage

About Metal Oxide Varistors

Cosmic Devices is the leading supplier and trader of MOV for Surge Protection in the market. These products are designed by reliable vendors of the market using advanced technology and latest machines with superior grade basic material. Clients can avail our range of reed switches at the most competitive prices.

Features:

1. Compact design

2. Perfect finish

3. Durability

Reliable Overvoltage Protection

MOVs serve as passive electronic components that absorb and suppress unexpected voltage spikes, protecting sensitive devices from electrical damage. Their swift response and high surge current handling (up to 10kA) make them indispensable in power supplies, industrial equipment, and telecommunications. The robust construction ensures stable, flame-retardant performance even in harsh environments.

Versatile Applications and Easy Installation

These varistors are suitable for through-hole mounting and are available in multiple sizes (7mm to 20mm disk diameter) to fit various circuit boards. Their blue epoxy-coated ceramic bodies and radial leads simplify integration for indoor electrical protection in consumer, industrial, and telecom systems throughout India.

FAQs of Metal Oxide Varistors:

Q: How do Metal Oxide Varistors provide overvoltage protection in electrical circuits?

A: MOVs detect and respond to voltage spikes by rapidly changing their resistance, diverting excess energy away from sensitive components. This prevents damage from electrical surges in AC or DC systems.

Q: What is the typical clamping voltage for Metal Oxide Varistors and why is it important?

A: The clamping voltage is about 1.5 times the rated voltage. It defines the point at which the varistor limits further increase in voltage, safeguarding downstream electronics from transient surges.

Q: When should I use a Metal Oxide Varistor in my power supply or electronic circuit?

A: MOVs should be installed whenever protection against lightning strikes, switching surges, or transient voltage spikes is required, ensuring long-term reliability for sensitive equipment.

Q: Where are Metal Oxide Varistors commonly applied in India?

A: They are widely used in power supplies, telecommunications, industrial control systems, and consumer electronics, especially for indoor environments due to their IP20 rating.

Q: What is the process for installing a Metal Oxide Varistor?

A: MOVs are typically mounted through a circuit board using their radial leads. The process involves soldering the leads onto designated board holes, providing secure electrical connection.

Q: How does the energy absorption rating affect MOV selection for surge protection?

A: The Joule rating (10J to 430J) reflects a varistors ability to absorb surges. Choose a higher rating for circuits exposed to stronger transients, ensuring effective and safe suppression.

Q: What are the benefits of using Metal Oxide Varistors for circuit protection?

A: MOVs offer fast response times, high energy absorption, stable performance under stress, flame-retardant bodies, and compliance with key international safety standards, making them a reliable choice for surge protection.

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