20D821K MOV Varistor 820V

20D821K MOV varistor (Варистор, 820V), also known as VDR-20D821K, is a high voltage surge protection component used in AC power systems and industrial electronics. It clamps transient overvoltage caused by lightning, switching and grid disturbances, helping protect sensitive components.

This 820V varistor is typically used in 510VAC systems where higher voltage margin and strong surge capability are required.

Key Electrical Characteristics:

Varistor Voltage (1mA): 820V ±10%

Maximum Continuous Voltage: 510VAC / 670VDC

Maximum Clamping Voltage: 1355V

Peak Surge Current (8/20μs): 8kA

Maximum Energy (2ms): 220J

Capacitance (1kHz): approx. 450pF

With a 20mm disc size, this MOV provides higher surge current capability and energy absorption compared to smaller varistors, making it suitable for demanding environments.

20D821K is a reliable solution for engineers seeking an alternative to S20K510 and B72220S0511K101 in high voltage surge protection designs.

Typical Applications:

AC power systems

Industrial equipment

Power distribution units

Motor drives and control circuits

How Engineers Search This Product:

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510VAC MOV varistor

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AC line varistor 20mm

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Related MOV Varistor Models:

20D751K MOV Varistor

20D561K MOV Varistor

20D Series 20mm MOV Varistors

Replacement and Cross Reference

S20K510 (TDK EPCOS)

B72220S0511K101 (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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