Accessories for fuse switch disconnectors 3NJ41 Cover Comprehensive accessories for increased flexibility. From connecting bridges and auxiliary switches to various drives, fourth poles or contact covers: With a wide range of accessories, the switch disconnectors and transfer switches can be used for different requirements and retrofitted at any time. The Siemens fuse switch disconnectors 3NJ4 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.