What this MCCB is and what the ratings mean
The Siemens 3VA2110-7MS36-0CC0 is a SENTRON molded case circuit breaker (MCCB) in the starter protection product version, rated for a continuous current Iu of 100 A across a 40 °C to 50 °C ambient band — it holds 100 A flat through that range, then derates to 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. That thermal profile means the breaker can be installed in a warm panel without oversizing, as long as the ambient stays under 50 °C at full load. Breaking capacity is the headline: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V. Those are extreme fault-clearing numbers — the 330 kA figure at 240 V covers high-available-fault installations like large transformer secondaries or industrial substations. The 52.5 kA at 690 V still exceeds what most 690 V motor control centers will see. It is a 3-pole unit with an ETU310M electronic overcurrent release. The 'M' suffix on the release designates motor / starter protection characteristics, meaning it provides the Class 10 or Class 20 overload curve needed for motor starting inrush without nuisance tripping.
Built-in auxiliary and undervoltage release
The breaker ships with 2 auxiliary switches (HQ type) and an integrated undervoltage release (UVR). The auxiliary switches are wired for status feedback — open/closed indication to a PLC or status lamp. The UVR trips the breaker when control voltage drops, which is standard for safety circuits that need to drop power on loss of control supply. The auxiliary release design is listed as undervoltage release (UVR), and the supplied basic switch is order code 3VA2110-7MS36-0AA0. The integrated auxiliary trip is 3VA9608-0BB24 — these are the internal sub-assembly order codes if you need replacement parts.
Lifecycle and sourcing
Physical dimensions: 181 mm height, 105 mm width, 86 mm depth — standard SENTRON 3VA2 frame size. It mounts on a DIN rail or can be screw-fixed to a backplate. The 86 mm depth is shallow enough for most 200 mm deep enclosures.