Control a roller shutter with a power over 300W (90Kg)

To control a high power roller shutter the Wattcube Window is not enough. It needs an additionnal relay.


The Wattcube Window is used to control a wired roller shutter. It has two inputs to connect to a local switch and two outputs to control the motors of the roller shutter.

The maximum output power is 300W per output. Beyond this level the contacts of the relay will be damaged very quickly and can be short-cutted. Degradation becomes then irreversible. On a roller shutter, there may be very high currents and voltage peaks when starting and stopping the roller shutter.

The only solution is therefore to add a relay capable of undergoing these peaks of current and voltage. In this example we have chosen a relay with a 230VAC coil, contacts 16A being able to undergo current peaks greater than 80A.

The relay used here is an SPDT relay (single pole, double row). When the coil is energized, the contact is activated. If the coil is released, the contact is also released. On other types of relays, we can find DPDT relays (double pole, double throw). Double Throw means there are two contact circuits. Each circuit can drive maximum 8A. By connecting them in parallel, we arrive at 16A.

Cabling schematic

The Wattcube Window has its two outputs connected to the input A1-A2 of the relay. The outputs 11-12 and / or 21-22 are connected to the roller shutter to control.