The Siemens 3VA1163-1AA36-0BH0 is a SENTRON 3VA1 switch disconnector in an MCCB-style housing, rated for 63 A continuous current (Iu) on a 160 A frame. It is a pure disconnecting means — no overload or short-circuit protection elements inside — making it a load-break switch for isolation and safety disconnection where upstream protection is already in place. Rated for 690 V AC 50/60 Hz and 500 V DC, it handles both power distribution and motor-circuit isolation. The 3-pole unit carries a 24 V DC undervoltage release (UVR) that drops the contacts on loss of control voltage — a standard safety interlock for emergency-stop circuits and machine guarding. Auxiliary contact block is factory-fitted with 2 changeover switches plus 1 trip alarm switch (HQ type), giving three CO contacts total for status feedback to a PLC or indication lamp. The front terminal connection accepts clamp-type wiring, and the IP40 front face suits enclosed panel mounting.
What the Ratings Mean for Fit
The 63 A rated continuous current (Iu) is the maximum uninterrupted load the disconnector can carry in free air. Because there is no thermal or magnetic trip, this part cannot clear a fault — it relies entirely on an upstream circuit breaker or fuse. The 2 kA limited short-time withstand (1 s and 0.5 s) tells you the disconnector can hold closed through a fault until the upstream device clears, but it is not rated to interrupt that fault itself. The 690 V AC / 500 V DC maximum operational voltage sets the ceiling for isolation capability. In a 400 V panel this is comfortable; at 690 V it still provides a full air gap. The 15 000 mechanical endurance cycles (latching) is typical for a switch disconnector in this class — adequate for daily isolation in a production line, not for frequent switching under load. Operating temperature range of -25 °C to +70 °C and storage range of -40 °C to +80 °C cover most industrial enclosures, including unheated warehouses. The 38 W maximum power loss at rated current matters for thermal budgeting inside a sealed panel — plan for ventilation if multiple units are ganged.
Where It Goes in the Panel
The 3VA1 frame is a standard MCCB footprint: 70 mm deep, 76.2 mm wide, 130 mm tall. It mounts on a DIN rail or directly to a backplate via the frame's integral clips. The front terminal connections accept copper cable lugs or clamp terminals. The undervoltage release coil is rated for 24 V DC continuous duty. It has no leading contact, meaning the coil is energized directly from the control supply — no auxiliary contact sequence to delay dropout. Wire the UVR through an E-stop relay or safety PLC output; loss of 24 V opens the main contacts immediately. Optional motor drive can be added for remote switching, but this unit ships without it. The auxiliary contact wiring is brought out to the front terminal block — accessible with the panel door closed for commissioning checks.