Specification Brand : GTHURCS BulletPoint1 : Product Name: Solid State Module Relay SSR-120DD, 3-32VDC/12-220VDC; Current and Frequency: 120A, 50/60Hz. BulletPoint2 : Overall Dimensions (Approx.): 58 x 45 x 32 mm/2.3 x 1.8 x 1.26 inches (L*W*H); Net Weight: 116g; Material: Metal, Plastic, Electronic Parts BulletPoint3 : SSR application: no spark, no noise, high switching speed, anti-corrosion, anti-moisture, anti-vibration, long service life. reliability, electromagnetic compatibility and other characteristics. BulletPoint4 : Solid state relays are ideal for automatic process control applications and are an essential component of temperature controllers and other mechanical control systems. BulletPoint5 : Only one solid state relay in each package ExternallyAssignedProductIdentifier1 : 0737494112994 ExternallyAssignedProductIdentifier2 : 737494112994 IncludedComponents : SSR-120DD ItemName : Solid State Relay SSR-120DD 120A DC to DC Input 3-32VDC to Output 12-220VDC Single Phase Plastic Cover ItemPackageDimensions_Height : 6.2992 centimeters ItemPackageDimensions_Length : 3.7084 centimeters ItemPackageDimensions_Width : 4.699 centimeters ItemTypeKeyword : solid-state-relays Manufacturer : GTHURCS Material : Copper NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : SSR-120DD ProductDescription : Model:SSR-120DD Control Voltage:3~32VDC Min Control Current:5mA Max Control Current:25mA Load Voltage:12~220VDC Load Current:120A Insulation Resistance:500M Ohm/500VDC Off Leakage Current:≤2mA On Voltage:≤2V On-off-Time:≤10ms Ambient Temperature:-20~+75℃ Relative Humidity:≤95%(Non-condensing) Dimensions:57.4×44.8×32mm Weight:≤135g Choose a correct Current type Current of SSR=Current of Equipment*magnification PS: The magnification depend on the kind of your loading equipment. Resistive load :2 to 3 times Inductive load: 6 to 7 times Capacitive load:10 times The start-up current of capacitive and inductive loads is very large,Make sure you the kind of your loading equipment and choose carefully About the choice of heat dissipation and radiator Even with the same load, the more frequently the solid state relay is switched on and off, the more heat is generated. Please make sure that the SSR is in a good heat dissipation environment, choose a suitable heat sink, and ensure that it works within 158°F (70°C).