What this part is and what it does
The Siemens 3VA1163-1AA42-0BA0 is a SENTRON 3VA1 switch disconnector in a 4-pole configuration, rated for 63 A continuous current (Iu) on a 160 A frame. It is designed for isolation and switching of circuits where overload or short-circuit protection is handled upstream or by a separate device — the listing explicitly notes it ships without overload protection and without short-circuit protection. Rated insulation voltage (Ui) is 800 V, with a maximum operational voltage of 690 V AC 50/60 Hz and 600 V DC. The front face carries IP40 protection, suitable for enclosed panel mounting where tools are required to access live parts.
Key ratings and what they mean for fit
The 63 A rated continuous current (Iu) sets the maximum load this disconnector can carry continuously without exceeding its thermal limits. For a 4-pole device on a 160 A frame, this means the internal current path and busbar connections are physically sized for higher current, but the part is factory-limited to 63 A — it is not field-upgradable to a higher rating. The 38 W maximum power loss at rated current should be factored into enclosure thermal calculations. The undervoltage release (UVR) is factory-fitted and designed for 24 V DC. When control voltage drops below the dropout threshold, the UVR trips the disconnector open — a standard requirement for machinery safety circuits where loss of control power must isolate the load. The UVR does not include a leading contact; verify coil polarity and suppression for the DC circuit. Mechanical latching endurance is rated at 15,000 operating cycles. This is the expected life under no-load or low-load switching; frequent loaded switching will reduce service life. The operating temperature range is -25 °C to +70 °C, with storage from -40 °C to +80 °C.
Panel integration and connection
The main current circuit uses busbar connection with front terminal arrangement. This means the disconnector is designed to plug onto a busbar system (typically Siemens 3VA busbar adapters) rather than accepting lug or cable terminations directly. The 101.6 mm width (4-inch form factor) and 70 mm depth fit the standard 3VA1 panel footprint; mounting holes and busbar slots align with the SENTRON 3VA family. An optional motor drive can be added via the product extension slot. No auxiliary contacts are included (0 CO contacts, auxiliary contact version 'Without'). If status feedback is needed, a separate auxiliary switch module must be ordered and fitted. The trip indicator is also absent — visual confirmation of the open/closed state comes from the handle position only.