Siemens 3NH3420 is a size-3 low-voltage NH fuse base for a single pole, rated for 630 A and up to 690 V AC (1000 V DC), with double busbar terminals for robust, secure connections. It accepts NH fuse links from Siemens' NH family, making it a core component in low-voltage protection schemes inside distribution panels. This part has been superseded by the 3NH6420, which uses ceramic/steel construction. Used in Siemens LV fuse systems to provide reliable overcurrent protection in compact, single-pole configurations.
