What this part is — and what it isn't
The Siemens 3VA1116-1AA32-0KH0 is a SENTRON switch disconnector in a 3-pole MCCB-style housing, rated 160 A continuous at 40 °C through 50 °C, with a 690 V AC / 500 V DC operating voltage ceiling. It carries a shunt trip release (STL) for 220-250 V DC or 208-277 V AC, plus two auxiliary switches and one trip alarm switch, all HQ type. What it does not have — and this is the critical distinction for anyone sourcing it — is any overcurrent protection: no overload release, no short-circuit release. It is a load-break disconnect only, intended for isolation and switching duty where the upstream protective device handles the fault clearing.
Ratings and what they mean for fit
The 160 A rating holds flat from 40 °C to 50 °C, then derates to 158 A at 55 °C and 150 A at 70 °C. That means a panel ambient of 50 °C or below gets the full nameplate; above that, the continuous current drops by roughly 2 A per 5 °C step. The insulation voltage is 800 V, so it is comfortable on 480 V and 600 V class systems. Maximum power loss is 38 W — that is the heat it dumps into the enclosure, worth checking against your panel thermal budget if the disconnector runs near full load in a sealed cabinet. The shunt trip operates on a 220-250 V DC or 208-277 V AC control supply. That is a single-voltage-range coil — no undervoltage release, no leading contact. If your safety circuit requires a UVR or a delayed drop-out, this variant does not carry it; you would need a different order code in the 3VA1 family.
Panel fit and connection
The housing is 130 mm tall, 76.2 mm wide, and 70 mm deep — a compact 3-pole footprint that fits standard MCCB cutouts. The main circuit connects via busbar to front terminals, so the bus stabs come in from the front face, not the rear. That means the disconnector can be bus-tied in a distribution panel without rear-access wiring. The auxiliary and alarm switches are built in (3 CO contacts total), so no external add-on block is needed for status feedback to a PLC or indication lamp. IP40 on the front means it is protected against tools and wires larger than 1 mm — standard for enclosed panel-mount gear. Not rated for washdown or outdoor exposure without an additional enclosure.