The Siemens 3VA1163-1AA42-0HH0 is a SENTRON 3VA1 IEC frame 160 switch disconnector — a 4-pole, 63 A device built to isolate a circuit under load without providing overload or short-circuit protection. It ships with a shunt trip (STL) release rated 12-30 V DC or 24 V AC 50/60 Hz, plus two auxiliary switches HQ and one trip alarm switch HQ, all factory-integrated. Rated current holds flat at 63 A from 40 °C through 70 °C, so no derating curve to chase in a warm panel.
What the ratings mean for fit
The 63 A rating is non-derated across the full operating ambient range (–), meaning this disconnector carries its full nameplate current even at 70 °C — a useful margin for panels with dense heat buildup. The 800 V rated insulation voltage (Ui) and 600 V DC max rated operational voltage confirm it handles industrial DC bus voltages common in drives and UPS systems. The front-terminal busbar connection means it lands on a standard busbar system, not cable lugs — plan the busbar drop accordingly.
Panel integration notes
The 3VA1163-1AA42-0HH0 measures 70 mm deep, 101.6 mm wide, and 130 mm tall (–). The 101.6 mm width is a standard 4-pole modular footprint for IEC switch disconnectors in this frame size. IP40 on the front means it is protected against solid objects over 1 mm but not sealed against moisture — suitable for indoor panel mounting, not washdown zones. The optional motor drive allows remote switching if the panel layout requires it.
Auxiliary and trip wiring
Three CO contacts are available for auxiliary functions: two auxiliary switches HQ and one trip alarm switch HQ. The shunt trip (STL) release operates on 12-30 V DC or 24 V AC 50/60 Hz — a wide DC range that covers common 24 V control supplies with tolerance for voltage drop on long runs. There is no undervoltage release, so the disconnector holds closed on loss of control power; if undervoltage protection is needed, it must be added externally.