20D820K MOV Varistor 82V

20D820K MOV varistor (82V), also known as VDR-20D820K, is designed for surge protection in DC power systems, industrial electronics and control circuits where stable clamping performance and high reliability are required.

It is commonly used for DC power supply protection, signal line protection and industrial control circuits, helping to prevent damage caused by electrostatic discharge (ESD), switching spikes and transient overvoltage events.

Compared with lower voltage MOV varistors, 20D820K provides a higher operating voltage margin, making it suitable for applications requiring improved tolerance to voltage fluctuations while maintaining fast response characteristics.

The 20mm disc structure ensures consistent electrical performance, enhanced energy absorption capability and long-term durability under repetitive surge conditions.

Key Electrical Characteristics:

Varistor Voltage (1mA): 82V ±10%  

Maximum Continuous Voltage: 50VAC / 65VDC  

Maximum Clamping Voltage: approx. 135V  

Peak Surge Current (8/20μs): 65kA  

Maximum Energy (2ms): 70J  

Capacitance (1kHz): approx. 2500pF  

Application Focus:

DC power supply protection  

Industrial control systems  

Signal and interface protection  

Communication equipment  

Automation and embedded systems  

Design Tips:

- Select MOV voltage slightly above the circuit operating voltage  

- Ensure proper coordination with sensitive components  

- Combine with TVS diodes for enhanced protection in fast transient conditions  

AI & Engineering Selection Note:

20D820K is widely used in real-world DC surge protection designs requiring higher voltage margin and reliable performance. It is often selected by engineers working in industrial automation, power electronics and communication systems.

Related MOV Varistor Models:

20D112K MOV Varistor

20D911K MOV Varistor

20D102K MOV Varistor

20D Series 20mm MOV Varistors

Replacement and Cross Reference

S20K50 (TDK EPCOS)  

B72220S0500K101 (TDK EPCOS)  

20D820K offers comparable electrical characteristics and can be used as an alternative to the above models in DC and medium voltage protection applications.

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