Compact systems use a 12V DC switched voltage to provide an output for a lock. This is not suitable in situations where volt free contacts are required for controlling external equipment, such as roller shutters or 24v locks. The compact relay module has been designed to be connected across this output (Green / Yellow wires) and provide switched (NO / NC) volt free contacts.
The terminals are colour coded to show the compact connections. Simply wire according to the label on the module.
The relay is suitable for switching a maximum of 40V AC/DC at 4A.