Devantech USB-RLY04 - 4 x 16A USB relay
Price
$47.00
Powered and Controlled from the USB bus.
Relays - 4 with integrated snubbing of the normally open terminals
Power - Powered from standard USB bus
Control interface - USB with a mini B connector
Relay current - Up to 16Amp @24vdc or 250vac
Connections - Screw Terminals for N/O N/C and Common contacts.