Fuse switch disconnector, 1-pole switchable, size 1 I=250A, U=690V, screw connection M10, The 3NJ4 fuse switch disconnectors for low-voltage distribution. The 1- or 3-pole switchable 3NJ4 fuse switch disconnectors can be used in low-voltage distributors, network and transformer stations and cable distribution cabinets. The Siemens 3NJ4 fuse switch disconnectors are characterized above all by: 1. Compliance with the provisions of IEC/EN 60439-1 and IEC/EN 60947-3. 2. Voltage levels up to AC 690 V. 3. Parking position for maintenance work. 4. Vertical and horizontal installation position. 5. Climatic resistance. 6. Degree of protection IP30 with closed handle inserts, IP10 with open handle inserts.