What It Is and What It Does
The Siemens 3VA1110-1AA36-0CC0 is a SENTRON 3VA1 switch disconnector in an MCCB-style housing, rated for 100 A continuous at 40 °C through 70 °C without derating — a flat thermal curve that simplifies panel sizing in warm environments. It is a 3-pole device with a rated insulation voltage of 800 V and an operating voltage of 690 V AC or 500 V DC, making it suitable for isolating motor feeders, distribution sub-circuits, or transformer primaries in industrial switchgear.
Key Ratings and What They Mean for Fit
The 100 A rating holds across the full ambient range of 40 °C to 70 °C — no thermal derating curve to calculate. That simplifies BOM validation: if your load is 100 A or less, this switch disconnector fits without temperature-related headroom. The 690 V AC operating voltage covers standard 400 V and 480 V systems with margin for line-to-line transients. The 800 V insulation voltage confirms it is rated for use in 690 V networks per IEC 60947. The unit includes an undervoltage release (UVR) rated 120-127 V AC 50/60 Hz, plus two HQ auxiliary switches (form C, 2 CO contacts). The UVR trips the switch when control voltage drops below the dropout threshold — a standard safety interlock for motor starters or emergency-off circuits. The auxiliary switches provide status feedback to a PLC or indicator lamp without an add-on block.
Panel Integration and Mounting
The switch disconnector measures 70 mm deep, 76.2 mm wide, and 130 mm high — a 3-pole MCCB footprint that fits standard DIN-rail or panel-mount enclosures. Front terminal connections for the main circuit simplify wiring access in a crowded cabinet. IP40 on the front means protection against tools and wires >1 mm; the unit is intended for indoor switchgear, not washdown environments.