The Siemens 3VA1163-1AA36-0AG0 is a SENTRON switch disconnector in a three-pole MCCB-style package, rated for a continuous current Iu of 63 A. It is built without overload or short-circuit protection — this is a straight disconnect, not a circuit breaker — so it serves applications where the upstream protection is already sized and you just need a visible-break isolation point on the line side of a load. Rated insulation voltage Ui is 800 V, with max operational voltage 690 V AC 50/60 Hz and 500 V DC. That AC voltage rating covers 400 V and 480 V distribution common in panel builds; the DC rating supports battery or drive-bus isolation. Power loss maxes at 38 W — manageable in a standard enclosure but worth checking if the panel is tightly packed.
What the ratings mean for fit
The 63 A continuous rating means this disconnect handles motor loads, resistive heaters, or general distribution feeders up to that current. It is not a motor-protective device — there is no thermal-magnetic trip inside — so the branch circuit must already have a properly coordinated MCCB or fuse upstream. The part's job is load-break isolation and visible-open confirmation during lockout/tagout. Front terminal connection accepts lug or clamp terminations (the listing specifies clamp connection). The footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — the same width as a standard 3-pole 160 A frame MCCB from the 3VA series, so it drops into the same panel cutout and bus-bar spacing as the breaker version. IP40 on the front means it is protected against tools and wires >1 mm but not against water spray; mount in a clean indoor panel or add an enclosure cover for washdown areas.
Auxiliary contacts and integration
The disconnect ships with one auxiliary switch (CO contact) and one trip alarm switch (CO contact), both HP-rated. That gives you two independent signal paths — one for position feedback to a PLC or status light, one for a remote alarm if the disconnect trips (though in a pure disconnect without internal overcurrent release, the alarm switch signals manual operation or an external shunt-trip event). The auxiliary contacts share the same enclosure depth and can be wired without removing the disconnect from the bus. An optional motor drive is listed as available for remote operation, which is useful for automated isolation sequences or remote panels. No undervoltage release or communication module is fitted from the factory — this is a basic disconnect, not a smart breaker. The reference code per DIN EN 81346-2 is Q, the standard designation for switching devices in industrial schematics.