![CDATA[(Screw fastening, without fastening claws) Intended use Coupling of automatic switches (Article Nos.: ..3181.., ..3281..) to KNX systems Installation in device box with dimensions according to DIN 49073 KNX medium: TP 256 Nominal voltage KNX: DC 21 ... 32 V SELV Ambient temperature: −25 ... +55 °C Storage/transport temperature: −25 ... +70 °C Protection class: III]]>