Burda RELAX DARK IRC IP55 Notice D'utilisation Et D'entretien page 17

Circuit breaker
L1
L2
L3
N
Earth
If the product is used indoors, it must be controlled by a chronothermostat.
To control a product with three-phase connections with a single-phase chro-
nothermostat, you will need a remote control switch and connect everything
following the diagram below.
RCD* Fuse 10A
BRELD4500