Silicon Carbide Varistors with Leads

Silicon Carbide Varistors with Leads

HVR Silicon carbide (SiC) varistors are composed of approx. 90% silicon carbide of various grains and approx. 10% ceramic binder and additives.

After shaping, the varistors are sintered at high temperatures in specific ambient conditions. The electrical contact is manufactured by spraying on a metal layer. The electrical connection is by soft soldered tinned copper wires.

The HVR SiC varistors have good voltage dependences and high energy absorption. They are manufactured mainly as discs with varying sizes, as the required electric values are most easily obtained with these geometric dimensions.

One of the most advantages of a SiC Varistor is the behaviour in the case of a fault. It has a self-healing characteristic and doesn´t shorten the circuit.

Typical applications are:

• Overvoltage in the mains, caused by lighning, inductive or capacitive coupling
• Consumption in switch contacts with inductive load
• Limit overvoltages in transformers, motors, generator windings and magnet coils