1 Channel Relay Module 30A with Optocoupler Isolation 5V Supports High and Low Trigger.
 
Trigger voltage range:
05V Low level trigger module :0-2VDC relay ON (ON), 3-5VDC relay OFF (OFF)
 
05V high level trigger module :3.3-5VDC relay ON (ON), 0-2.5VDC relay OFF (OFF)
 
Specifications
Coil voltage: 5V DC
Coil current: 50mA
Controlled voltage: 30VDC and (250VAC) Max
Maximum load current: 30A
Release Time:    10ms    
Operate Time:    10ms