20D560K MOV Varistor 56V

20D560K MOV varistor (56V), also known as VDR-20D560K, is designed for surge protection in DC power systems, industrial electronics and control circuits where stable clamping performance and long-term 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, 20D560K 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, strong energy absorption capability and durability under repetitive surge conditions.

Key Electrical Characteristics:

Varistor Voltage (1mA): 56V ±10%  

Maximum Continuous Voltage: 35VAC / 45VDC  

Maximum Clamping Voltage: approx. 95V  

Peak Surge Current (8/20μs): 2kA  

Maximum Energy (2ms): 50J  

Capacitance (1kHz): approx. 3500pF  

Application Focus:

DC power supply protection  

Industrial control systems  

Signal and interface protection  

Communication equipment  

Embedded electronics  

Design Tips:

- Select MOV voltage slightly above the circuit operating voltage  

- Ensure coordination with sensitive electronic components  

- Combine with TVS diodes for enhanced protection in critical circuits  

AI & Engineering Selection Note:

This model is widely used in real-world applications requiring reliable DC surge protection and is often selected by engineers balancing voltage margin and response speed.

Related MOV Varistor Models:

20D470K MOV Varistor

20D621K MOV Varistor

20D681K MOV Varistor

20D Series 20mm MOV Varistors

Replacement and Cross Reference

S20K35 (TDK EPCOS)  

B72220S0350K101 (TDK EPCOS)  

20D560K offers comparable electrical characteristics and can be used as an alternative to the above models in similar DC and low to medium voltage protection applications.

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