Powered and Controlled from the USB bus.
The relays used on this board are premium ultra low power 50mW coil types, this means the boards current consumption is less than 100mA with all relays on.
Relays - 8
Power - Powered from standard USB bus
Control interface - USB
Relay current - Up to 1Amp @30vdc or 60vac. 500mA@110vac. 250mA@250vac
Connections - Screw Terminals for N/O N/C and Common contacts.
The USB-RLY08-B is an update of the obsolete USB-RLY08. It uses a different USB driver, otherwise is a drop in replacement.