VDR OCELIT® High Performance Silicon Carbide Varistors

Application Data

Technical Properties for VDR OCELIT® Series 820 SB for High Power and High Pulse Frequency:

Characteristic Value Units
Disc Outer Diameter da 80 +2 -1 mm
Disc Inner Diameter di 10 +/- 1 mm
Density ρ 2.0 ... 2.2 g.cm-3
Weight of One Disc 95 g
Temperature Coefficient of Voltage TCV (αv) -0.12 ... -0.18 % K-1
Temperature Coefficient of Voltage TCC (αi) +0.50 ... +0.80 % K-1
Non - Linearity Coefficient > 2  
Thermal Conductivity at Maximum Permissible Temperature > 10 W.m-1.K-1
Maximum Permissible Surface Temperature (Air) vmax    
Not Coated 180 °C
Coated with Epoxy 125 °C
Maximum Thickness of Coating 2 mm
Specific Heat c 0.65 J.g-1.K-1
Maximum Continuous Load Capacity Δv = 80 °K (Uncoated)    
Packed Assembly 15 W
Separate Assembly 19 W
Mean Impact Strength 1.9 kJ = kWs
Temperature Coefficient of Expansion (TCE) αLE +4 ... 6 10-6K-1
Compressive Strength (Disc) σp > 50 N.mm-2
Maximum Gradient of Voltage (Air) 2.0 kV.cm-1