Specification Brand : Heschen BulletPoint : Price For: EachOrder Unit: Each 1 Contact Configuration:: SPST-NO Control Voltage Max:: 32 Control Voltage Min:: 3 Load Current:: 3 Operating Voltage Max:: 280 Operating Voltage Min:: 24 Relay Terminals:: Through Hole SVHC:: No SVHC (17-Dec-2014) Switching Mode:: Zero Crossing BulletPoint1 : Load current: 25A, 50/60Hz BulletPoint2 : Load Voltage: 24-220VDC BulletPoint3 : Control Voltage: 4-32VDC BulletPoint4 : LED working instructions BulletPoint5 : CE ISO9001 listed Color : Black ConnectorType : Screw CurrentRating : 25 amps ExternallyAssignedProductIdentifier : 8216763220834 ExternallyAssignedProductIdentifier1 : 0715990219744 ExternallyAssignedProductIdentifier2 : 715990219744 ExternallyAssignedProductIdentifier3 : 00608641480740 IncludedComponents : inc ItemName : Heschen Single Phase DC/DC Solid State Relay, SSR-25DD, Input 4-32VDC, Output 24-220VDC, 25A 50-60Hz ItemPackageDimensions_Height : 3.4 centimeters ItemPackageDimensions_Length : 6.4 centimeters ItemPackageDimensions_Width : 5 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : solid-state-relays Manufacturer : Heschen Material : Copper Material1 : Plastic Material2 : Metal MaximumSwitchingCurrent : 25 amps MaximumSwitchingVoltage : 220 volts MeasurementSystem : Imperial MeasurementSystem1 : Imperial MeasurementSystem2 : Metric MinimumSwitchingVoltage : 4 volts_of_direct_current ModelNumber : SSR-25DD MountingType : DIN Rail Mount NumberOfItems : 1 NumberOfTerminals : 3 OperationMode : Manual PartNumber : SSR-25DD ProductDescription :
SSR Solid State Relay are DC relay, Triac output.
The triac version of the zero switching relay is a cheap solution for resistive loads the zero switching relay switch when the DC sine voltage just crosses zero.
The switch turn off when the current crosses zero.