1、Pure Copper: This solid state relay adopts red copper base plate in high purity, and premium plastic material. 2、Intelligent Chip: This SSR 40DD features inbuilt intelligent chip, and the barrier device used to realize the isolation between the control end and the load end. 3、Stable Performance: This solid state relay 40DD with good optocoupler ensures stable performance and excellent power cycling. 4、High Safety: This DC to DC solid state relay provides higher isolation voltage, keeping electrical appliances safe. 5、Stable Operation: The premium material ensures fast heat dissipation, prevent overheating and protect solid stable operation. 1 x Solid State Relay Item Type: Solid State RelayMaterial: PlasticProduct Size: Approx. 45 x 62 x 24mm / 1.77 x 2.44 x 0.94in ( Manual Measurement, Slight Error May Exist )