Switch disconnector for isolation and switching duty
The Siemens SENTRON 3VA1225-1AA42-0JH0 is a 4-pole switch disconnector in MCCB design, rated for 250 A continuous current (Iu) with a maximum rated operational voltage of 690 V AC 50/60 Hz and 600 V DC. It is built without overload or short-circuit protection — its job is safe isolation and load-break switching under rated conditions, not fault interruption. The shunt trip release (STL) operates on 110–127 V DC or AC 50/60 Hz, allowing remote tripping for emergency-stop or interlock circuits.
What the ratings mean for panel fit
The 250 A rated continuous current (Iu) is the maximum load this disconnector can carry continuously without exceeding its thermal limits — sized for feeder or large motor branch circuits. The 57 W maximum power loss at rated current must be factored into enclosure ventilation; in a sealed panel, that heat adds to the internal rise. The 70 mm depth and 140 mm width fit standard MCCB mounting footprints, and the busbar connection with front terminals simplifies bus-stack assembly or cable landing on the line and load sides.
Auxiliary contacts and shunt trip configuration
This variant ships with 2 auxiliary switches (HQ type) plus 1 trip alarm switch — three CO contacts total for status feedback to a PLC or indication panel. The shunt trip (STL) is factory-installed; there is no undervoltage release. A motor drive is available as an optional extension for remote motorized operation. The IP40 front protection means it is suited for enclosed panel mounting, not open washdown areas.
Lifecycle and sourcing posture
The lifecycle stage is listed as current — this is an active, in-production Siemens SENTRON catalog item. It is sourced and quoted to order through independent distribution; availability and current pricing are confirmed at quote time against an RFQ. No official successor or cross-reference is recorded, so the BOM line should specify this exact order code.