Advantage of using SSRs/thyristors
Reduced maintenance and operating costs as there are no moving mechanical parts to fail.
Electrically quieter as the device turns ON/OFF at zero volts so doesn’t create RFI interference.
Line distortion is eliminated.
Finer control and extended heater element life due to shorter cycle times that increase process stability and decrease heater thermal shock.
Heater shows less expansion and contraction caused by heating and cooling action.