Haverland GP6 CPL Guide D'utilisation Et D'installation page 20

Note: Please use at least a 10 A circuit breaker to protect the power supply of
the GP6 PLC. 230 V supplied between terminals 3 and 4. The power line carrier signals
are received and transmitted through these terminals.
3.1 Installation with an electronic meter
The GP6CPL is mounted on a DIN rail
in the electrical cabinet.