20D680K MOV Varistor 68V

20D680K MOV varistor (68V), also known as VDR-20D680K, 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, 20D680K provides a higher operating voltage margin, making it suitable for applications requiring increased tolerance to voltage fluctuations while maintaining fast response characteristics.

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

Key Electrical Characteristics:

Varistor Voltage (1mA): 68V ±10%  

Maximum Continuous Voltage: 40VAC / 56VDC  

Maximum Clamping Voltage: approx. 110V  

Peak Surge Current (8/20μs): 2kA  

Maximum Energy (2ms): 60J  

Capacitance (1kHz): approx. 3000pF  

Application Focus:

DC power supply protection  

Industrial control systems  

Signal and interface protection  

Communication equipment  

Embedded and automation systems  

Design Tips:

- Select MOV voltage slightly above the circuit operating voltage  

- Ensure coordination with sensitive components  

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

AI & Engineering Selection Note:

20D680K is widely used in real-world DC protection designs where higher voltage margin and stable surge suppression are required. It is commonly selected by engineers working on industrial and power electronics applications.

Related MOV Varistor Models:

20D102K MOV Varistor

20D821K MOV Varistor

20D911K MOV Varistor

20D Series 20mm MOV Varistors

Replacement and Cross Reference

S20K40 (TDK EPCOS)  

B72220S0400K101 (TDK EPCOS)  

20D680K offers comparable electrical characteristics and can be used as an alternative to the above models in DC and low to medium voltage protection applications.

All trademarks, brand names and part numbers mentioned are the property of their respective owners. They are used for reference and comparison purposes only and do not imply any affiliation or endorsement.

For datasheet, quotation or sample request:

Email: sales@huaandz.com  

WhatsApp: +86-134-2790-5674