What It Is and What It Does
The 3VA1163-1AA42-0BH0: The part includes an undervoltage release (UVR) rated for 24 V DC, which automatically opens the disconnector when control voltage drops, preventing automatic restart after a power dip. It also carries 2 auxiliary switches and 1 trip alarm switch (HQ type) for remote status indication — useful for PLC or SCADA feedback on disconnect position.
Deployment Context and Mounting
This switch disconnector mounts in a panel via front terminals with busbar connection — the main circuit connects through busbars, not cables, so it is sized for a distribution busbar system. The IP40 front protection means it is suitable for indoor panels where dust ingress is limited; no washdown rating. Dimensions are 130 mm height, 101.6 mm width, 70 mm depth — the 101.6 mm width (4-inch) is a standard 4-pole frame footprint for the 3VA1 series, so it fits existing cutouts and busbar spacing in SENTRON distribution boards.
Key Ratings and Their Meaning
Rated insulation voltage Ui is 800 V, and maximum operational voltage is 690 V AC 50/60 Hz or 600 V DC — so it is rated for 690 V three-phase systems (common in industrial distribution) and for DC circuits up to 600 V. The short-time withstand rating is 2 kA for 0.5 s and 1 s — this is the fault current the disconnector can carry momentarily without damage while upstream protection clears. It is not a breaking capacity rating; the disconnector is not designed to interrupt fault currents. Operating temperature range is -25 °C to +70 °C, storage -40 °C to +80 °C, which covers most indoor industrial environments.