This is a SPST-NO SSR with small dimensions provides DC output switching for PCB assembly or socket mount occasion,especially for some high density mounting applications. With DC input control, compatible with 5VDC, 12VDC, 24VDC and 60VDC logic systems. The relays provide 2500Vrms opto-isolation between input and output. The relays' pin are full compatibility to the electromechanical standard relay, so very convenient for user install and use.