Switch Disconnector with Fuses – SENTRON 3NJ63
The Siemens 3NJ6313-4AB0.-.... is a 3-pole switch disconnector with fuses from the SENTRON 3NJ63 family, rated 250 A at AC23A 500 V. The NH1 fuse base accepts standard NH gG/gL fuse links, and the integrated electronic fuse monitoring (EFM 10) signals a blown fuse — critical for keeping a motor branch circuit alive when a single fuse opens. This unit is built for motor-drive operation — the description calls out motordrive operating, so it is intended for remote or automated switching via a motorised operator, not just a manual handle.
The 3NJ6313-4AB0.-.... is an in-line design, pluggable NH1 fuse carrier. The motor-drive operator (ordered separately if not included) attaches to the front of the switch. Fuse monitoring EFM 10 provides a volt-free contact or electronic signal — check the wiring diagram for the specific EFM variant; the signal can be wired to a PLC input for remote fuse-status indication. The NH1 fuse carrier accepts fuse links up to 250 A. Cable termination is via bolted connections on the line and load sides.