Switch disconnector for panel isolation and load-break duty
The Siemens 3VA1163-1AA42-0AF0 is a SENTRON 3VA1 series switch disconnector built in an MCCB-style molded case, rated for 63 A continuous current across the full ambient range from 40 °C through 70 °C — no derating needed in a warm enclosure. Four poles handle three-phase plus neutral isolation, with a maximum AC operational voltage of 690 V and a DC rating of 600 V. Front terminals accept busbar connection, and the front face carries IP40 protection — suitable for enclosed panel mounting where tools are required to access live parts.
What the ratings mean for fit
The 63 A continuous rating is flat from 40 °C to 70 °C ambient, so this disconnector handles full load current without derating even in a tightly packed panel or near a heat source — a practical advantage over breakers that must be downsized above 40 °C. With a maximum power loss of 38 W at rated current, the heat dissipated inside the enclosure is modest; still, cluster several of these in a sealed box and the cumulative heat needs ventilation planning. The auxiliary contact configuration — one auxiliary switch plus one trip alarm switch (HQ type) — gives a single set of status feedback and a separate alarm signal for tripped condition, enough for most remote monitoring circuits without an add-on module.
Lifecycle and sourcing posture
Physical dimensions — 70 mm depth, 101.6 mm width, 130 mm height — match the standard 3VA1 MCCB footprint, so it drops into existing panel cutouts and busbar layouts for that series without rewiring.