What this part is and where it lands in the panel
The Siemens SENTRON 3VA1163-1AA42-0AB0 is a 4-pole switch disconnector built in an MCCB-style frame (IEC frame 160) rated at a continuous 63 A. It carries no overload or short-circuit protection — it is a pure disconnect, sized for isolating a load circuit under load or no-load conditions. The 63 A rating holds flat across the full operating temperature range from 40 °C up to 70 °C, so no derating curve to track for warm enclosures. Rated insulation voltage is 800 V, with AC operating voltage to 690 V and DC to 600 V. It ships with a nut keeper kit and two factory-installed auxiliary switches (HP type) for status feedback back to the PLC or safety relay.
What the ratings mean for fit
The 63 A rating is continuous and temperature-independent across the operating range (-25 °C to 70 °C), so it handles a full 63 A load even in a hot panel near the top of the enclosure. The 4-pole design (3 poles + switched neutral) makes it suitable for three-phase systems where the neutral needs isolation. Front terminals accept busbar connection for the main circuit, which keeps wiring tidy in a distribution panel. The IP40 front protection means it is fine in a clean indoor panel but not for washdown environments. Mechanical life is rated at 15,000 operating cycles — adequate for infrequent disconnect duty (maintenance isolation) rather than daily switching. Power loss at rated current is 38 W, which matters for thermal budgeting in a densely packed enclosure.
Panel integration notes
Mounts in a standard MCCB cutout — 70 mm depth, 101.6 mm width, 130 mm height. The front terminals and busbar connection mean the busbars run across the front, not the rear, so plan the busbar routing accordingly. The two auxiliary switches (HP) are pre-installed and wired; they provide status feedback without needing a separate auxiliary contact block. Optional motor drive available for remote operation. No undervoltage release or shunt trip on this variant — if you need those, look at the 3VA1 family with the release option.