Description:25A SSR Input Voltage:3-32VDC Input Current:DC3-25mA Output Voltage:24-480VAC Current Rating:25A Output:Triac On Voltage:1.5V Off Leakage Current:2mA On-off Time:10mS Dielectric Strength:2500VAC Insulation Resistance:1000M/500VDC Ambient Temperature:-30~+75 Switch method:zero-cross turn on Dimension:2.25 x 1.75 x 1.25 (inch) , 57 x 32 x 45 (mm) Weight:90g It's for switching AC power source from 24V to 480V. The control signal is 3-32V DC. Please note it needs a heatsink to work with it. Color: picture color Material: PC + metal Package Contents: 1*Single Phase Solid State Relay Note: To test an SSR, the easiest way is to use a bulb. Please check the following video. A multimeter won't help since there's a small current leakage even if the output of the SSR is open. Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.