The Siemens SENTRON 3VA1110-1AA42-0KC0 is a 4-pole switch disconnector in MCCB design, rated for 100 A continuous current (Iu) with a 160 A frame. It carries no overload or short-circuit protection — this is a pure disconnect for isolation and switching duty, not a circuit breaker. The shunt trip (STL) release operates on 220-250 VDC or 208-277 VAC, giving you remote trip capability for emergency-stop or process-interlock circuits. Two built-in HQ auxiliary switches report contact position back to the PLC or panel indicators.
What the ratings mean for panel fit
The 100 A continuous rating (Iu) defines the maximum load it can carry without overheating — sized for feeder or main disconnect duty on a 100 A circuit. The 800 V rated insulation voltage (Ui) and 690 VAC / 600 VDC max operational voltage (Ue) cover standard 400/480 VAC panels and DC bus applications up to 600 V. The 4-pole configuration switches three phases plus neutral, common for TN-S or TN-C-S systems where the neutral must be isolated. Front terminals with busbar connection mean it lands directly on a panel busbar system, not on cable lugs — verify your busbar pitch matches the 101.6 mm width footprint. IP40 on the front is splash-protected against tools and fingers but not washdown; keep it inside a sealed enclosure in wet environments.
Deployment context
Mounts in a standard panel on a busbar system via front terminals. The 70 mm depth fits shallow enclosures. The shunt trip allows integration into safety circuits or remote shutdown schemes — wire it to an E-stop relay or PLC output for controlled disconnection. The two HQ auxiliary switches (CO contacts) provide status feedback for SCADA or local indication. The 15 000-cycle mechanical endurance is typical for a disconnect used in daily switching rather than infrequent isolation.