Solid State Relay Features: Current:0.5A-400A Voltage:12V-680V Small General outline Vacuum Wwld Techinics Make R/C(MOV) inside could absorb out 1TSM LED mean turn on or OFF Clarity protect Panel IEC standard Input&output type could chose DC/AC,AC/AC,DC/DC,AC/DC Typical Applications: AC DCswitch&Temp control Automate Control Numerical conrtol Machinery