On the top row once the phase (L) is connected and the loads are then supplied to the switched phase.
The buttons on the bottom row are operated with 24V, which are provided by the relay module.
To use the relay module, a 24 VDC power supply is required, for example, a DIN rail power supply with 24VDC output.
The relay module can not be taught for a center or other HomeMatic devices without a LAN gateway. When delivered, the device without a center is not really useful usable.
The package includes:
EQ3 HomeMatic I / O module (relay module)
Manual (German, English)
Dimensions (W * H * D): 36 * 87 * 72mm
The unit corresponds to 4 modules.