What this part is and what it isn't
The Siemens 3VA1110-1AA36-0JH0 is a SENTRON switch disconnector in a molded-case circuit breaker (MCCB) form factor — three poles, 100 A rated continuous current (Iu), with a shunt trip release (STL) for remote opening. What it does NOT have: overload protection, short-circuit protection, or undervoltage release. This is a pure disconnect with a remote-trip coil, sized for the 3VA1 IEC frame 160. Rated insulation voltage is 800 V (Ui), and the maximum operational voltage is 690 V AC 50/60 Hz or 500 V DC. That shunt trip coil is wound for 110–127 V DC or AC 50/60 Hz — verify your control voltage matches before wiring.
What the ratings mean for the panel
The 100 A continuous rating is the maximum uninterrupted current the disconnect can carry without exceeding its thermal limits. Power loss at full load is 38 W — that's heat that stays inside the enclosure, so factor it into your panel thermal calculation, especially if the disconnect is grouped with other heat sources. Mechanical endurance is 15 000 operating cycles. That's the number of open-close operations the mechanism is rated for before wear-out. For a switch disconnector used as a manual service disconnect cycled a few times a year, that's effectively lifetime; for a frequently switched load, it's a maintenance interval. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. The IP40 front protection means the front face is protected against tools and small wires (1 mm diameter), but the part is not sealed against moisture — install in a clean, dry enclosure or one with a higher overall IP rating.
Auxiliary contacts and trip signaling
This variant ships with 2 auxiliary switches (form C, CO contacts) plus 1 trip alarm switch — all HQ (high-quality) type. That gives you three separate signal paths: two for status feedback (open/closed) and one dedicated to indicating a shunt-trip event. The trip alarm switch changes state only when the disconnect is opened by the shunt trip or a manual trip mechanism, not by normal switching — useful for remote fault annunciation.