What this MCCB is and where it fits
The Siemens 3VA2110-7MS36-0AE0 is a SENTRON molded case circuit breaker (MCCB) designed for starter protection — meaning it's built to sit ahead of a motor starter combination, providing both short-circuit and overload protection in a single compact package. It's a 3-pole unit rated for 100 A continuous current at 40 °C, with no derating needed all the way up to 70 °C — that's unusual and simplifies panel thermal management. The adjustable thermal-magnetic trip unit covers a 300 A to 1 500 A range, so you set the instantaneous pickup to coordinate with downstream devices. Breaking capacity is the headline here: 330 kA at 240 V, 242 kA at 415/440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That 330 kA at 240 V is high enough for most transformer-secondaries and large UPS feeds — you're not going to run out of SCCR headroom in a typical 480 V distribution panel. The steep drop to 3.7 kA at 690 V tells you this breaker is optimized for low-voltage (≤600 V) systems, not 690 V motor circuits.
Physical fit and panel integration
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. That 86 mm depth is the key number for enclosure selection — it fits standard 200 mm deep enclosures with room for wiring gutters. The 105 mm width is a 4-pole-equivalent footprint on the DIN rail, so plan your busbar takeoffs accordingly. No undervoltage release, no shunt trip, no communication module on this variant — it's a straight thermal-magnetic breaker with four auxiliary switches (HQ type) for status feedback to the PLC or SCADA. Power loss is 10 W maximum — negligible for panel heat budgeting, but worth noting if you're packing multiple breakers in a sealed enclosure. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. No phase-failure detection or ground-fault monitoring on this variant — those are separate accessory modules.