Switch disconnector 3VA1, 100 A, 4-pole — what it is and what it does
The SENTRON 3VA1110-1AA42-0JH0 is a 4-pole switch disconnector in MCCB (moulded-case circuit breaker) design, rated for 100 A continuous at 40 °C through 70 °C — no derating across the full operating temperature range. It is built to the IEC frame 160 standard and serves as a manual load-break disconnect, not a protective device: it has no overload or short-circuit protection elements. The part carries a shunt trip (STL) release rated 110–127 V DC and AC 50/60 Hz, plus a complement of 2 auxiliary switches and 1 trip alarm switch (HQ design).
Ratings and what they mean for fit
The 100 A rating holds flat from 40 °C to 70 °C ambient — no thermal derating curve to apply, which simplifies panel sizing in warm enclosures. Rated insulation voltage is 800 V, with operating voltages of 690 V AC and 600 V DC. The shunt trip operates on 110–127 V DC or AC 50/60 Hz; verify control voltage matches your trip circuit before specifying. The front terminal arrangement accepts busbar connection, typical for panel feed-through or distribution blocks. IP40 on the front face means it is protected against tools and wires >1 mm but not against water ingress — suitable for indoor switchgear, not washdown areas.
Integration notes — panel and wiring
The 3VA1 frame mounts with a nut keeper kit (included per the description). Dimensions: 70 mm depth, 101.6 mm width, 130 mm height — fits standard MCCB cutouts in switchgear panels. Mechanical service life is 15 000 operating cycles typical. Power loss at rated current is 38 W maximum; factor this into enclosure thermal calculations. The auxiliary switch complement (2 CO + 1 trip alarm) provides status feedback for PLC or indication lamps without adding external relay blocks.