Siemens Sentron 3NW7 Retaining Holder. Tube fuses/ Cartridge fuses (Electrical Engineering / Components for panels and boxes / Fuses and accessories). Principal data: size 3P mm, current rating 400 A. Supplied under manufacturer part number 3NW7531-8HG, EAN 4001869523200, HS code 8536.90, country of origin Germany.