This relay could be controlled with 24V trigger. It also has a optocoupler to interconnect two separate electrical circuits. It is module ready for easy Arduino project integration. QUICK SPECS: Maximum load: AC 250V/10A, DC 30V/10A Trigger current: 5mA Working voltage: 24V Module size: 50 x 26 x 18.5mm (L x W x H) Four mounting bolts holes, diameter 3.1mm Module Interface: DC+: positive power supply (VCC) DC-: negative power supply (GND) IN: can be high or low level control relay Relay Outputs: NO: normally open relay interface COM: Common Interface Relays NC: normally closed relay interface High and low level trigger options: Low level trigger when jumper is connected to LOW pin High level trigger when jumper is connected to HIGH pin