20D681K MOV Varistor

20D681K MOV varistor (680V), also known as VDR-20D681K, is used for protecting electrical systems against transient overvoltage caused by lightning, switching or power disturbances. It provides fast response and effective voltage clamping to safeguard sensitive components. Also known as: 20D681

This model is suitable for AC power circuits, industrial systems and electrical equipment where higher operating voltage and strong surge endurance are required.

With its 20mm disc design, this varistor provides enhanced surge handling capability compared to smaller sizes, making it suitable for demanding environments.

Key Electrical Characteristics:

Varistor Voltage (1mA): 680V ±10%

Maximum Continuous Voltage: 420VAC / 560VDC

Maximum Clamping Voltage: 1120V

Peak Surge Current (8/20μs): 8kA

Maximum Energy (2ms): 180J

Capacitance (1kHz): approx. 550pF

Typical Applications:

Power supply systems

Industrial equipment

Electrical distribution systems

Motor and drive circuits

Engineering Notes:

- Select appropriate voltage rating based on system voltage

- Ensure sufficient surge margin for long-term reliability

- Confirm PCB spacing and mounting conditions

Related MOV Varistor Models:

20D621K MOV Varistor

20D751K MOV Varistor

20D Series 20mm MOV Varistors

Replacement and Cross Reference

S20K420 (TDK EPCOS)

B72220S0421K101 (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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