What this MCCB is and where it lands
The Siemens 3VA2110-7MS36-0KL0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for starter protection — meaning it's built to sit ahead of a motor starter combination, not just a general distribution feeder. Three poles, 100 A continuous at 40 °C all the way up to 70 °C (no derate needed in that band), and a breaking capacity that starts at 330 kA at 240 V and drops to 242 kA at 415/440 V, then 187 kA at 500 V, and 3.7 kA at 690 V. That 330 kA at 240 V tells you this thing is meant for high-fault locations — think transformer secondaries or large bus risers where the available fault current is brutal.
What the ratings mean for your panel
At 105 mm wide, 181 mm tall, and 86 mm deep, this MCCB fits standard SENTRON mounting footprints — the 86 mm depth is the key number for enclosure depth planning, especially if you're retrofitting into an existing panel with limited gland-plate clearance. The 100 A rating is flat across the full 40–70 °C ambient range, so you don't lose headroom in a hot enclosure. That's unusual and saves you from having to oversize the frame just because the panel runs warm.
Auxiliary and release configuration
Comes with a shunt trip release (STL) and a full auxiliary switch complement: 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ. That means you get remote trip capability and status feedback without adding external modules. The basic switch order code is 3VA21107MS360AA0 — useful if you're ordering spare switch blocks separately.