Fuse switch-disconnector 3-pole switchable, size 3 I=630A, U=690V screw connection M12, new design. The 3NJ4 fuse switch-disconnectors are designed for low-voltage distribution. The 1- or 3-pole switchable fuse switch-disconnectors 3NJ4 can be used in low-voltage distribution boards, main and transformer stations, as well as cable distribution cabinets. The Siemens 3NJ4 fuse switch-disconnectors are particularly distinguished by the following features: 1. Compliance with IEC/EN 60439-1 and IEC/EN 60947-3 standards; 2. Voltage levels up to AC 690 V; 3. Parking position for maintenance work; 4. Vertical and horizontal mounting position; 5. Climatic resilience; 6. Protection class IP30 with closed handle inserts, IP10 with open handle inserts. Siemens offers an integrated portfolio of protection, switching, measuring, and monitoring devices, distribution systems, as well as switches and sockets for a safe, efficient electrical infrastructure in buildings and industry.