What this part is and what it does
The Siemens 3VA1110-1AA42-0HA0 is a SENTRON 3VA1 IEC frame 160 switch disconnector — not a circuit breaker. It is a 4-pole, 100 A rated (Iu) device designed for isolation and switching, with no overload or short-circuit protection built in. The part carries a shunt trip (STL) release rated 12–30 V DC and 24 V AC 50/60 Hz, which lets you trip it remotely via a control signal. Rated continuous current Iu is 100 A. Max rated operational voltage is 690 V AC 50/60 Hz and 600 V DC. The 4-pole configuration switches all four phases (or three phases plus neutral) in one action, which is typical for main incomers or distribution feeders where full isolation is required. It is rated for a limited short-time withstand of 2 kA at both 0.5 s and 1 s — meaning it can hold off a fault current at that level for the stated duration without damage, but it relies on an upstream protective device to clear the fault. This is a switch disconnector, not a breaker; the interrupting capability is not its own.
Integration and mounting
The main current circuit connects via busbar connection, front terminal arrangement — designed for panel mounting with busbar feeders, not lug or cable tails. The front terminal layout keeps wiring accessible from the panel face. Dimensions: 70 mm depth, 101.6 mm width, 130 mm height. The 101.6 mm width is the 4-pole frame width (roughly 4 inches) — wider than the 3-pole version (76.2 mm) of the same frame. Panel cutouts and busbar spacing must account for this. Protection class IP40 on the front — suitable for enclosed panel use where no water jets or dust ingress are expected on the operator face. The rest of the device relies on the enclosure for environmental sealing.
Shunt trip and auxiliary options
The shunt trip (STL) is the only auxiliary release fitted — no undervoltage release, no auxiliary contacts, no communication function. The coil is rated 12–30 V DC and 24 V AC. Verify the control voltage matches your signal source; the DC range is wide enough for most 24 V nominal systems, but the AC rating is fixed at 24 V. Optional motor drive is available as a product extension (field-fit or factory option). No auxiliary contact slots are populated (0 CO contacts). If you need status feedback, an auxiliary contact block must be added separately.
Environmental and electrical ratings
Operating temperature range: -25 °C to +70 °C. Storage range: -40 °C to +80 °C. Maximum power loss is 38 W at rated current — this is the heat dissipated inside the panel, so factor it into enclosure thermal calculations. Rated insulation voltage Ui is 800 V. Reference code per DIN EN 81346-2 is Q (switching device). Latching endurance is 15,000 operating cycles — mechanical life, not electrical under load.