20D911K MOV Varistor 910V

20D911K MOV varistor (910V), also known as VDR-20D911K, is designed for high voltage surge protection in demanding AC power systems where strong clamping capability and high energy absorption are required.

This component is widely used in 380V–550VAC systems, offering effective protection against transient overvoltage caused by lightning strikes, switching surges and grid disturbances in industrial environments.

Compared with medium voltage MOVs, 20D911K features a higher operating voltage range and improved surge endurance, making it suitable for harsh conditions such as power distribution systems, industrial drives and energy equipment.

Its 20mm disc structure provides excellent surge current handling capability and long-term stability under repetitive surge exposure.

Key Electrical Characteristics:

Varistor Voltage (1mA): 910V ±10%  

Maximum Continuous Voltage: 550VAC / 745VDC  

Maximum Clamping Voltage: approx. 1500V  

Peak Surge Current (8/20μs): 8kA  

Maximum Energy (2ms): 260J  

Capacitance (1kHz): approx. 350pF  

Application Focus:

High voltage AC mains protection  

Industrial power systems  

Motor drives and inverters  

Power distribution equipment  

Energy and renewable systems  

Design Tips:

- Select MOV voltage according to system voltage (380V–550VAC range)  

- Ensure sufficient surge energy margin in industrial applications  

- Use coordinated protection (fuse + MOV) for enhanced safety  

Related MOV Varistor Models:

20D681K MOV Varistor

20D751K MOV Varistor

20D821K MOV Varistor

20D Series 20mm MOV Varistors

Replacement and Cross Reference

S20K550 (TDK EPCOS)  

B72220S0551K101 (TDK EPCOS)  

All trademarks and part numbers mentioned are for reference only.

For datasheet, quotation or sample request:

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