20D621K MOV Varistor

20D621K MOV varistor (620V), also known as VDR-20D621K, is designed to protect electrical and electronic systems from transient overvoltage. It reacts rapidly to surge events and helps clamp excessive voltage to protect sensitive components. Also known as: 20D621

This model is widely used in AC power input stages, industrial equipment, control systems and power distribution circuits where reliable surge protection and higher working voltage are required.

Compared with lower voltage MOV types, this model is suitable for applications requiring higher operating voltage margins and stable surge performance.

Key Electrical Characteristics:

Varistor Voltage (1mA): 620V ±10%

Maximum Continuous Voltage: 385VAC / 505VDC

Maximum Clamping Voltage: 1020V

Peak Surge Current (8/20μs): 8kA

Maximum Energy (2ms): 170J

Capacitance (1kHz): approx. 600pF

Typical Applications:

Industrial power systems

AC input protection

Electrical control panels

Power distribution units

Selection Considerations:

* Ensure correct working voltage margin

* Verify surge current requirement of the application

* Check mechanical dimensions for PCB compatibility

Related MOV Varistor Models:

20D561K MOV Varistor

20D681K MOV Varistor

20D Series 20mm MOV Varistors

Replacement and Cross Reference

S20K385 (TDK EPCOS)

B72220S0381K101 (TDK EPCOS)

All trademarks and part numbers mentioned are the property of their respective owners and are used only for cross reference and comparison purposes.

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