3NB1332-4KK11 SIEMENS

The 3NB1332-4KK11 SITOR fuse, manufactured by Siemens, is a crucial component designed for the protection of semiconductor devices in demanding power electronic applications. This fuse boasts a size 3 designation and a high current rating of 350A, making it suitable for safeguarding circuits against overcurrents and short circuits. Its aR characteristic signifies its fast-acting behavior, ensuring rapid interruption of fault currents to minimize damage to sensitive equipment. The fuse is rated for 1100V DC and 1800V VSI (Voltage Source Inverter) applications, with a 1300V DC UL rating, indicating its compliance with stringent safety standards. It is also suitable for use at the MBC (Medium Base Current) at 5 times the nominal current. The fuse features a screw connection with an M10 thread for secure and reliable mounting. Its overall length of 210mm and slotted knife contacts facilitate easy installation and replacement. This SITOR fuse provides robust protection for a wide range of applications, including variable speed drives, uninterruptible power supplies (UPS), and other power conversion systems, ensuring the reliable operation of critical infrastructure.