This solid state relay without transparent cover SSR Application: With a switch no spark, no noise,high switching speed,anti-corrosion,moisture more→-proof,anti-vibration,long life.high reliability,electromagnetic compatibility and other characteristics.It can be widely used in aerospace,marine,household appliances,machine tools,telecommunications,automobile,mining,etc.automation and control area. BECAREFUL ! Many factories produce SSR relay but label it higher than actual, but we never like this do it ! we are profesional manufacturer of ssr ,our price is competitive, and we make it