The Siemens 3VA1110-1AA42-0AA0 is a SENTRON switch disconnector in MCCB design, 4-pole, rated 100 A continuously from 40 °C through 70 °C with no derating — that flat thermal curve means it holds full current in a warm cabinet without needing to oversize. Rated for 690 V AC and 600 V DC, with an insulation voltage of 800 V, this unit is built for main-circuit isolation in industrial panels — it has no overload or short-circuit protection, so it serves as a manual load-break switch, not a circuit breaker. The front terminal and busbar connection pattern (width 101.6 mm, depth 70 mm, height 130 mm) fits the standard 4-pole MCCB footprint; it mounts on a DIN rail or panel baseplate and accepts busbar links for common feed distribution.
Ratings and what they mean for the panel
The 100 A rating holds at 40 °C through 70 °C — no thermal derating across the operating range. Maximum power loss is 38 W at rated current, which is modest for a 100 A 4-pole device — the heat it dumps into the enclosure is predictable and low enough to avoid forced ventilation in most standard panels. Mechanical service life is 15 000 operating cycles typical — this is a switch-disconnector rated for frequent manual operation on a production line, not a daily-use contactor, but 15k cycles covers years of normal isolation duty. Front IP40 protection means it's splash-proof from the front face but not sealed against dust ingress from the sides or rear — standard for panel-mounted MCCB-style devices where the enclosure provides the overall IP rating.
What it does and does not include
This switch disconnector has no trip indicator, no undervoltage release, no auxiliary contacts, no auxiliary release, no communication function, and no voltage trigger — it is a bare manual isolator with a rotary handle, designed to break load current and provide visible isolation. No overload or short-circuit protection is built in; upstream protection must be provided by a separate circuit breaker or fuse. A motor drive is available as an optional extension (product extension optional: yes), so the switch can be motorized for remote or automatic isolation if needed — the base unit ships without it.