20D431K MOV Varistor 430V

20D431K MOV varistor (430V), also known as VDR-20D431K, is designed for surge suppression in AC power systems where higher operating voltage and enhanced reliability are required.

This component is widely used in 230V–275VAC power lines, offering effective protection against transient overvoltage caused by lightning strikes, switching operations and grid instability.

Compared with lower voltage MOV varistors, 20D431K provides a higher clamping threshold and improved surge endurance, making it suitable for industrial environments and applications with unstable power conditions.

Its 20mm disc structure ensures high surge current capability and long service life under repetitive surge conditions.

Key Electrical Characteristics:

Varistor Voltage (1mA): 430V ±10%  

Maximum Continuous Voltage: 275VAC / 350VDC  

Maximum Clamping Voltage: approx. 710V  

Peak Surge Current (8/20μs): 8kA  

Maximum Energy (2ms): 160J  

Capacitance (1kHz): approx. 700pF  

Application Focus:

AC mains surge protection  

Switching power supplies  

Industrial control equipment  

Home appliances and white goods  

Power distribution systems  

Design Tips:

- Select MOV voltage based on actual AC mains level (230V–275VAC systems)  

- Ensure sufficient surge energy margin for harsh environments  

- Combine with fuse or thermal protection for safety-critical designs  

Related MOV Varistor Models:

20D361K MOV Varistor  

20D391K MOV Varistor  

20D561K MOV Varistor  

20D Series 20mm MOV Varistors

Replacement and Cross Reference

S20K275 (TDK EPCOS)  

B72220S0271K101 (TDK EPCOS)  

All trademarks and part numbers mentioned are for reference only.

For datasheet, quotation or sample request:

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