Thermal derating — what the 100 A rating really means in your panel
The 3VA1110-5EF32-0HH0: The 100 A rating holds flat from 40 °C up to 50 °C ambient, so a warm panel at 50 °C still carries the full 100 A. Above that it derates: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If your enclosure sits near a motor drive or in a hot machine room, size the breaker for the actual ambient, not the nameplate.
Breaking capacity across voltage — selectivity planning
This MCCB's interrupting rating drops as voltage rises: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. For a 690 V line, that 17 kA SCCR is the hard ceiling — verify your available fault current stays under it, or step up to a higher-rated 3VA variant. The 800 V rated insulation voltage (Ui) confirms it's built for 690 V systems, not just 480 V.
Physical fit and accessory layout
The breaker measures 70 mm deep by 76.2 mm wide by 130 mm tall — standard 3-pole MCCB footprint for a 100 A frame. It ships with a shunt trip (STL) release and a 2-auxiliary + 1 trip-alarm switch block (HQ), so you get remote trip capability and status feedback without ordering separate kits. No undervoltage release, no ground-fault module, no communication function — this is a clean line-protection build. The basic switch variant is 3VA11105EF320AA0.
Sourcing and lifecycle
Lifecycle status is marked as current — Siemens still builds this exact order code. It's available through our independent distribution channel, quoted to order against an RFQ. No last-time-buy clock ticking, no broker scramble. If you need a functional second-source, the 3VA1110-5ED36-0AC0 is the closest peer in the same frame size but with different trip settings — verify your coordination study before swapping.