Metal Oxide Varistors (MOVs) serve as control or compensation elements in electrical circuits, providing optimal operating conditions and protecting sensitive components against excessive transient voltages. When triggered by voltage surges, they shunt excessive current away from critical components, ensuring system reliability and longevity.

The "J" designation indicates high surge capability models. Key specifications for the 20D681K model:

• Maximum AC Voltage: 420V
• Maximum DC Voltage: 560V
• Varistor Voltage (V1mA): 680V (612-748V range)
• Nominal Discharge Current: 6500A standard / 10000A high surge
• Energy Absorption: 230J standard / 400J high surge
• Capacitance @ 1KHz: 600pF

20D Series standard dimensions (unit: mm):

• Diameter (MAX): 23mm
• Height (H): 26.5mm
• Lead Spacing (F): 7.5±0.8mm or 10±1.0mm
• Lead Diameter (d): 0.8mm or 1.0mm
• Lead Length (C): 1.4mm or 1.6mm

The 20D681K is specifically recommended for:

• AC 240V Line-to-Line Applications (UK, Australia, Middle East)
• AC 380V Line-to-Line and Line-to-Ground Applications
• Charging Pile Protection Systems
• Industrial Power Supply Protection

20D Series packaging specifications:

• Models 180K-471K: 3 units per carton
• Models 561K-122K: 1.5 units per carton
• Custom packaging available upon request

Proper varistor selection ensures optimal protection:

• Varistor voltage must exceed maximum continuous operating voltage
• Nominal discharge current should exceed expected surge currents
• Clamping voltage must be lower than protected component safety limits
• Consider capacitance requirements for signal transmission applications
• Ensure proper resistance matching between protected circuit and varistor

Complete product series range:

• 05D, 07D, 10D, 14D Series