The Siemens Arc fault detection device block AFDD current is 40A and supply voltage is 230V for MCB or RCBO 1+N 2MW .The new arc fault detection device is super compact making it suitable for both installing in new buildings and retrofitting into existing. At any time, a standard-compliant expansion of the electrical installation to protect against electric fires is possible – easily and without the need for additional space. Siemens offers a comprehensive portfolio of protection, switching, measuring and monitoring devices, distribution systems as well as switches and sockets for safe and efficient electrical infrastructure in buildings and industry. Protection class IP IP20 if the distribution board is installed, with connected conductors Silicon- free