The Siemens 3NJ6314-1AB0.-.... is a SENTRON 3NJ63 switch disconnector with fuses in an in-line design, pluggable NH1 size, rated 250 A across 4 poles. It is rated for AC23B duty at 500 V and carries a 55 kA breaking capacity at AC500 V, with manual operation and integrated fuse monitoring EFM 10. This is a made-to-order unit (product class C), so each piece is produced per order and not stocked as a standard off-the-shelf item.
The AC23B utilization category means this switch disconnector is designed for switching motor loads or other highly inductive loads — not just resistive. At 250 A and 500 V, it handles a 3-phase motor up to roughly 132 kW (typical 4-pole induction motor at 400 V), though the exact motor FLC must be checked against the AC23B derating curve. The 55 kA rated short-circuit making capacity at AC500 V tells you the device can close onto and withstand a fault up to that prospective current without welding or failing — critical for coordination with upstream protection.
RoHS compliant since 27 September 2019. REACH Article 33 information is available on request.