Metal-Oxide Varistors for surge protection 18D series

Metal-Oxide Varistors Application

Metal-oxide varistors are widely used in various sectors of electronic engineering due to their effectiveness in surge protection. Their applications span across several key areas:

1. *Communication Systems: Protecting telecommunication equipment from transient surges.

2. Electrical Power Systems: Used in electricity meters, distribution cabinets, and power switches to ensure system reliability.

3. Consumer Electronics: Essential in home appliances, surge protection boxes, and voltage regulators.

Specific Applications Include:

- Telephone systems

- Power surge protection boxes

- Lightning arresters

- Socket and distribution boxes

Surge suppressor of Metal-Oxide Varistors Application example as below:

Surge Suppressor Varistor Advantages

Metal-Oxide Varistors (MOVs) are essential components in surge protection due to their unique properties and reliability. Here are key advantages:

• Wide Voltage Range: MOVs handle a broad spectrum of voltages, ensuring compatibility with diverse electronic systems.
• High Energy Tolerance: Capable of managing significant transient currents, making them ideal for high-energy environments.
• Nonlinear Voltage Clamping: Their nonlinear resistance effectively clamps voltage spikes, providing robust protection.
• Low Leakage Current: Ensures energy efficiency with minimal impact on circuit performance under normal conditions.
• Symmetrical Performance: Consistent operation in both polarities enhances the reliability of surge protection.
• Fast Response: MOVs react quickly to voltage surges, safeguarding sensitive electronics immediately.
• No Continuous Flow: Prevents continuous current post-clamping, reducing the risk of sustained overvoltage.
• Strong Surge Absorption: Absorbs and dissipates significant energy, crucial for effective surge protection.
• Durability and Longevity: Manufactured with high-quality materials for reliable, long-term performance across various applications.

These advantages make Metal-Oxide Varistors indispensable for protecting electronic systems in both consumer and industrial settings.

Surge Suppressor Varistor Dimensions

The 18D series MOVs feature a standardized element disc diameter of 18mm, ensuring consistent performance across different voltage ratings. This size is optimized for balancing energy absorption capacity with physical form factor, making these varistors suitable for a wide range of electronic assemblies.

Selection of Metal-Oxide Varistor Surge Protection

When selecting metal oxide varistors for surge protection, it is crucial to consider the following factors:

1. Nominal Voltage:The typical operating voltage of the circuit.

2. Maximum Continuous Operating Voltage (MCOV):The highest voltage that the metal-oxide varistors can endure without degradation.

3. Clamping Voltage: The peak voltage the surge suppressor varistor will allow during a surge.

4. Energy Absorption Capacity: The maximum energy the metal oxide varistor surge protection can absorb during a transient event.

5. Physical Size Constraints: The available space within the circuit design for placing the metal-oxide varistors.

Metal-Oxide Varistor Surge Protection Key Features

Metal-oxide varistors are known for their robust surge protection capabilities, characterized by:

1. Wide Voltage Range: Suitable for low to high voltage applications.
2. High Energy Absorption: Capable of handling large surges without degradation.
3. Fast Response Time: Immediate action upon surge detection, protecting sensitive electronics.
4. Durable and Reliable: Long lifespan with stable performance under repeated surges.

Metal-Oxide Varistors Working Principle

In their normal state, metal-oxide varistors exhibit a high impedance, ensuring they do not interfere with circuit operations. Upon detecting a transient surge voltage that exceeds their breakdown voltage, their impedance rapidly decreases, diverting the surge current away from sensitive components and protecting the circuit.

Surge Suppressor Varistor Naming Rules

Varistor naming typically follows a structured format that reflects key specifications such as maximum allowable voltage and varistor voltage. For example, the "18D" series indicates an 18mm disc diameter, with subsequent characters representing the voltage ratings.Details are as below: