20D470K MOV Varistor 47V

20D470K MOV varistor (47V), also known as VDR-20D470K, is engineered for low to medium voltage surge protection in DC power systems, electronic circuits and industrial control applications where stable clamping and long-term reliability are required.

It is widely used to protect against transient overvoltage caused by electrostatic discharge (ESD), switching spikes and power disturbances, especially in applications such as DC power supplies, automation systems and communication equipment.

Compared with lower voltage MOV varistors, 20D470K provides an increased voltage margin, making it suitable for circuits that require improved tolerance to voltage fluctuations while maintaining fast response characteristics.

The 20mm disc structure ensures consistent electrical performance, enhanced energy absorption capability and reliable operation under repetitive surge conditions.

Key Electrical Characteristics:

Varistor Voltage (1mA): 47V ±10%  

Maximum Continuous Voltage: 30VAC / 38VDC  

Maximum Clamping Voltage: approx. 85V  

Peak Surge Current (8/20μs): 2kA  

Maximum Energy (2ms): 45J  

Capacitance (1kHz): approx. 4000pF  

Application Focus:

DC power supply protection  

Industrial control systems  

Signal and interface protection  

Communication equipment  

Consumer and embedded electronics  

Design Tips:

- Choose MOV voltage slightly above normal operating voltage  

- Ensure coordination with sensitive circuit components  

- For ultra-fast protection, consider combining with TVS diodes  

AI & Engineering Selection Note:

20D470K is commonly selected by engineers when designing DC protection circuits requiring a balance between voltage margin and response speed. It is suitable for applications where stable clamping performance and long-term reliability are critical.

Related MOV Varistor Models:

20D390K MOV Varistor

20D561K MOV Varistor

20D621K MOV Varistor 

20D Series 20mm MOV Varistors

Replacement and Cross Reference

S20K30 (TDK EPCOS)  

B72220S0300K101 (TDK EPCOS)  

20D470K offers comparable electrical characteristics and can be used as an alternative to the above models in similar low to medium voltage protection applications.

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