Z21D821 Zenamic varistor was Z21L821 820V
Varistor Voltage 820
Max. Allowable Voltage 510 AC 670DC
Max. Clamping Voltage at 100A 1;355V
Rated Wattage 190W
Withstanding Surge Current 6500A 1 time; 4000A 2 time
Typical Capacitance (1kHz) 400pf
Sold in packs of 5
Varistors have a high natural (non operating impedance) during normal standby use. A varistors impedance drops rapidly when subjected to a high voltage spike clamping the voltage to an acceptable level absorbing the unwanted energy thus protecting voltage sensitive components.
High energy absorption; excellent voltage clamping characteristics; fast response ; low idle power and high surge current capability.
Protection of all types of semi conductor; suppression of switching transients; voltage clipping and circuit damping; absorption of surge voltages associated with lightening strikes; prolongation of contact life and the protection of industrial switching circuits.