The Siemens SENTRON 3VA2110-5HN36-0HH0 is a 3-pole molded case circuit breaker rated for 100 A continuous current (Iu) across a 40 °C to 50 °C ambient — it holds full rating up to 50 °C, then derates to 85 A at 70 °C. That 100 A frame makes it a fit for main feeder or large motor branch protection in a 400 V distribution panel. Breaking capacity is the headline here: 187 kA at 240 V, 121 kA at 415/440 V, dropping to 79 kA at 500 V and 4.25 kA at 690 V. The 690 V figure (4.25 kA) is the weak point; verify fault current at that voltage before specifying. The ETU350 electronic trip unit handles the overcurrent protection — adjustable thermal-magnetic or electronic curve depending on the variant.
The 3VA2110-5HN36-0HH0 is the line-protection variant with shunt trip. If your panel was originally specified around a 3VA1110-5EE32-0JA0 (a different frame size and trip unit), the physical footprint and bus-bar centers differ — it will not drop in without re-termination and coordination review. Stick with this exact order code for a like-for-like swap.
The 70 °C operating limit at 85 A derating covers most machine-room environments.