What it is and what the ratings mean
The Siemens 3VA2110-7MN32-0CH0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection — that means its trip curve and auxiliary package are tuned for motor-start inrush and overload, not just cable protection. Rated 100 A continuously from 40 °C through 70 °C, so no derating needed in a warm panel or near a motor junction box. The interrupting capacity tells you where it can live: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V — that high 330 kA figure at 240 V means it handles a strong fault upstream without needing a current-limiting fuse ahead of it.
Motor protection features
This MCCB includes phase failure detection — if one phase drops out on a three-phase motor, the breaker trips before single-phasing cooks the winding. It also carries an undervoltage release (UVR) that drops the breaker if supply voltage falls below a threshold, so the motor doesn't re-accelerate uncommanded after a brownout. The auxiliary switch configuration is 2 auxiliary switches + 1 trip alarm switch HQ — that gives you two form-C contacts for status feedback (open/closed) plus a separate alarm contact that only changes state on a trip, not a manual open. Trip indicator is present, so you can tell at a glance whether the breaker tripped on fault or was switched off.
Mounting and panel fit
Dimensions are 105 mm wide, 181 mm high, 86 mm deep. That 105 mm width is the standard 3-pole MCCB footprint for this class — it fits the same panel cutout and bus-bar spacing as other SENTRON 3VA2 breakers. Depth of 86 mm means it clears a standard 200 mm deep enclosure with room for wiring gutters. Operating temperature range is -25 °C to 70 °C; storage range -40 °C to 80 °C. Power dissipation at rated load is 12.5 W maximum — negligible for thermal panel calculations unless you pack a dozen in one enclosure.