STS Thyristor Switch for Dynamic Reactive Power Compensation Device (Reactive Power Dynamic Regulator) STS series dynamic reactive power compensation switching regulator is a electronic power unit which is capable of switching the shunt capacitor fast in low voltage. Charateristics  Use foreign good brand SCR, high reliability and stability   MCU control precise trigger, software correction trigger timing for true zero switching   While switching capacitor, no flow, no overvoltage, no sparks, fast response time of less than 15ms  Support level and pulse trigger mode, the trigger mode is flexible and easy to replace transform.  Use optical isolation to avoid interference  Phase lack alarm with overheat protection