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: 1000MΩ/500VDC Ambient Temperature: -30~+75 ℃ Switch method: zero- turn on Dimension: 2.25 x 1.75 x 1.25 (inch) , 57 x 32 x 45 (mm) Weight: 450g 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: 5 x 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 '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 reflection 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.