Relay Module 1Ch 12V with Optocoupler.

Opto-isolated 10A Change-over Relay.
On-board optocoupler circuit withrelay active led indicator.
3-way connector block for 12Vdc supply and relay operating signal connections - active high or low select using jumper link - 5V logic compatible.
3-way terminal block connects to relay contacts.
Relay contacts rated at 10A 250Vac/30Vdc.
Relay activation signal is isolated from the relay via the opto isolator.
Dims - 50.3mm(l) x 26.2mm(w) x 17mm(h). 4 x 3mm fixing holes.