The Siemens SENTRON 3VA1225-1AA32-0JC0 is a 3-pole switch disconnector in the SD100 variant of the 3VA IEC frame, rated for a continuous current Iu of 250 A. It provides visible isolation for a circuit under load — no overcurrent or short-circuit protection built in, so it serves as a main disconnect or maintenance isolation point where the upstream breaker handles fault clearing. The 250 A continuous rating matches a 250 A frame, sized for feeder or large-motor disconnect duty. The unit carries a short-time withstand of 3 kA for 1 s — that's the fault current it must survive closed until the upstream protective device clears. For a switch disconnector, this rating governs the maximum available fault current at its line side.
Auxiliary and trip options — shunt trip and 2 HQ aux switches
The shunt trip is wired separately from the main power path; energizing it trips the mechanism. Two HQ auxiliary switches (form C, 2 CO contacts) provide status feedback — closed/ open position signals back to the control system. The HQ designation indicates a high-qualified switch rated for control-circuit reliability. No undervoltage release is fitted on this order code. If the application requires a UVR (trip on power loss), a different variant or a field-installable accessory is needed. The unit also supports an optional motor drive (product extension optional yes) for remote motorized operation — useful in automated disconnects.
Integration into the panel — dimensions, connection, environment
The 3VA1225-1AA32-0JC0 occupies a 105 mm width, 158 mm height, and 70 mm depth on the panel face — a 3-pole frame that fits standard SENTRON mounting footprints. Main circuit connection is via busbar connection at the front terminal, meaning the line and load conductors land on busbars that bolt to the front of the disconnect. This is typical for main-switch applications where the busbar runs across multiple disconnects or feeds a distribution block. Front protection is IP40. Maximum power loss is 57 W. In a typical line-disconnect role cycled once per shift, this translates to decades of service. For frequent switching under load, consult the electrical endurance curve in the device manual.
Lifecycle and sourcing reality — current production, quoted to order
The part is specified into the BOM as a Siemens SENTRON switch disconnector, and the order code uniquely identifies the shunt-trip voltage and auxiliary switch configuration.