Description: Solid State Relays,Crydom Relays, HBC Relays, Power Controllers,SSR's, SCR's,Electric Relays and Phase Angle Power Controllers from National Plastic Heater, Sensor and Control Inc., GTA, Toronto, Canada
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A solid state relay has a few major differences from an electromechanical one. SSRs have no moving parts and are extremely fast switching. SSRs are generally designed to turn on/off power when the line voltage crosses 0, so there is a smaller surge and no arcing which is a major problem with electromechanical relays that leads to their failure. Due to the fact that SSRs use semiconductor circuitry to switch the current, there is some heat that must be removed from the relay due to an internal voltage drop.
SCR's or silicone controlled rectifiers are switching devices for electrical power and have no moving parts. These devices can switch electrical loads within milliseconds and for millions of times. The increased speed allows for choosing between zero cross switching (also called zero-cross firing, burst firing or fast cycling) or phase angle switching. Heater life will be greatly increased by minimizing heater temperature fluctuations because of the less contraction and expansion of the heating elements. El