Siemens 3VA1163-1AA42-0DH0 — SENTRON 4-Pole Switch Disconnector, 63 A
The Siemens 3VA1163-1AA42-0DH0 is a 4-pole switch disconnector from the SENTRON 3VA series, built in an MCCB (Molded Case Circuit Breaker) design. It carries a rated continuous current Iu of 63 A flat across the ambient range — no derating needed from 40 °C up to 70 °C, which simplifies panel sizing in warm enclosures. Rated for 690 V AC 50/60 Hz and 600 V DC, it handles both line and motor isolation duties in industrial control panels. The front-terminal busbar connection suits it for panelboard or distribution-board mounting where space is tight — footprint is 101.6 mm wide by 130 mm tall by 70 mm deep.
Ratings and what they mean for your panel
The 63 A continuous rating holds at every temperature from 40 °C to 70 °C — no knock-down factor to calculate. That is unusual for an MCCB-style device; most need a derate above 40 °C. For a panel running warm (say 50 °C interior), you still get the full 63 A. The rated insulation voltage Ui is 800 V, giving headroom for 690 V AC systems. Short-time withstand: limited to 1 s at 2 kA, and also rated 2 kA for 0.5 s AC. That is a modest fault rating — this is a switch disconnector, not a full-rated MCCB for high-fault service. It is sized for isolation and switching under load, not for interrupting high-level faults. Pair it with upstream protection (fuse or MCCB) rated for your available fault current. Power loss is 38 W maximum at rated current. That adds to enclosure heat load; factor it into your thermal calculation if the panel is densely packed.
Auxiliary and release configuration
This variant ships with an undervoltage release (UVR) and a 3-pole auxiliary contact block: 2 auxiliary switches (NO/NC configurable) plus 1 trip alarm switch. The UVR trips the disconnector when control voltage drops below a set threshold — standard for safety circuits that need to drop power on loss of control supply. No communication function on this unit; it is a standalone disconnect. The front IP40 rating means it is protected against tools and wires >1 mm — fine for indoor panel use, but not for washdown or outdoor installation without an enclosure. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C.