Switch disconnector with fuses — SENTRON 3NJ63
The 3NJ6303-3AC0.-....: The Siemens 3NJ6303-3AC0 is a 3-pole switch disconnector with fuses from the SENTRON 3NJ63 family, rated 160 A for NH00 fuse links.
AC23A at 500 V is the duty that matters: it covers occasional switching of motors, transformers, and capacitor banks — loads with high inrush. The 160 A NH00 fuse holder accepts standard gG or aM fuse links up to that rating. Fuse monitoring (EFM 20) is built in, so you get a signal contact when a fuse blows — useful for remote fault indication on a panel or PLC input. The in-line design means the busbar path runs straight through, which keeps the panel layout clean and voltage drop predictable.