What this switch disconnector is and what it does
The Siemens 3VA1116-1AA36-0CC0 is a SENTRON 3VA1 switch disconnector in an MCCB-style moulded-case frame, rated for 160 A continuous current (Iu) on a 3-pole path. It carries no overload or short-circuit protection — it is a pure disconnect, intended for isolation and switching under load where the upstream protective device handles the fault interruption. The IEC frame 160 footprint (70 mm deep, 76.2 mm wide, 130 mm high) drops into the same panel cutout as a 3VA1 MCCB, so it retrofits into existing SENTRON busbar and terminal arrangements without re-drilling the mounting plate.
Key ratings and what they mean for fit
Rated continuous current Iu of 160 A means this switch disconnector carries the full load current continuously without exceeding a 38 W power loss at rated conditions — that loss figure governs the internal temperature rise and matters when the part is packed tightly in a multi-device panel. The max AC operational voltage is 690 V 50/60 Hz; the max DC operational voltage is 500 V. On a 400 V AC line, the 160 A rating gives headroom for a 110 kW motor circuit at full load, but the disconnect itself does not interrupt faults — that is the job of the upstream breaker or fuse. The 2 kA limited-time rating (1 s and 0.5 s) is the short-time withstand, not a breaking capacity; it confirms the switch holds closed under fault current until the upstream protective device clears.
Undervoltage release and auxiliary contacts
This variant ships with an undervoltage release (UVR) rated for 120–127 V AC 50/60 Hz. When the control voltage drops below the dropout threshold, the UVR trips the switch open — a standard safety interlock for motor circuits that must not auto-reclose after a voltage dip. The UVR has no leading contact, so it does not provide early break signalling. Two HQ auxiliary switches (CO contacts) are integrated, giving status feedback for the open/closed position without needing a separate aux block. The front terminal connection accepts standard clamp terminals for the main circuit.
Deployment context
The 3VA1 frame is designed for DIN-rail or panel-mount installation in industrial control cabinets. The IP40 front protection means it is suited for indoor, dry environments — not washdown or outdoor exposure. The front terminal arrangement allows straightforward busbar or cable connection from the panel face, typical for main disconnects in motor control centres and distribution boards.