BP4 series frequency sensitive varistor is suitable for 14-1000KW wound-type asynchronous induction motor for heavy-duty occasional starting, such as ball mill,Crusher, etc.BP6 series frequency sensitive varistor is suitable for three-phase AC winding asynchronous motor with frequency of 50Hz.For heavy duty starter.BP8Y series frequency sensitive varistor is suitable for new energy-saving motor capacity 1.5 kW 200 kW 50Hz,YZR series lifting and reverse connection equipment for heavy-duty metallurgical three-phase asynchronous motors under frequent operation.The rotor circuit of the induction motor in the access frequency sensitive rheostat,Generally, the common connection mode is adopted, and a short-circuit device such as a contactor is not required.Therefore, it is characterized in that the motor can obtain mechanical properties close to constant torque with a refined system.It is an extremely ideal starting element.

A varistor is a non-contact electromagnetic component that is equivalent to an equivalent impedance.During the motor starting process, the rotor current frequency decreases automatically due to the equivalent impedance(Automatic varistor) whereby only one rheostat electric car can be smoothly started up.The varistor is essentially a reactor with a large core consumption.It is the main part of the core and the two coils of the number of sheet steel folded Yamagata composition.