The Siemens 3VA1110-1AA42-0CA0 is a SENTRON 3VA1 switch disconnector in the IEC frame 160 footprint, rated for 100 A continuous current (Iu) with 4 poles. It carries no overload or short-circuit protection — the designation "SD100" and the description confirm it is a pure disconnect, not a molded case circuit breaker. The built-in undervoltage release (UVR) is factory-set for 120-127 V AC 50/60 Hz, so the switch drops open when control voltage falls below the dropout threshold. This makes it a load-break switch for isolation and safety disconnection, not a protective device.
Rated continuous current Iu is 100 A — that is the maximum current the switch can carry continuously without exceeding temperature limits. The 4-pole configuration handles three-phase plus neutral (or a second pole for DC switching). Max rated operational voltage is 690 V AC 50/60 Hz and 600 V DC, so it covers standard 400/480 VAC panels and many DC bus applications up to 600 V.
The main circuit connection is busbar connection with front terminals — designed for direct busbar mounting or panel wiring. The 4-pole width (101.6 mm) is wider than the 3-pole variants (76.2 mm), so a panel cutout or DIN-rail layout planned for a 3-pole MCCB will need extra space. The UVR coil wiring terminates at the front; no auxiliary contacts are included (auxiliary contact version is "Without"). An optional motor drive can be added (product extension optional).