What it is and what it does
The Siemens 3VA2110-7MS32-0BL0 is a SENTRON molded case circuit breaker (MCCB) with starter protection design — it's built to sit ahead of a motor starter, handling both overload and short-circuit protection in one package. Rated 100 A continuously across the full 40 °C to 70 °C ambient range, so no derating headache when the panel runs hot. Three poles, with a maximum interrupt rating of 1 500 A and a minimum setting of 300 A, giving you a wide adjustment band for motor FLA matching. The interrupting capacity tells the real story: 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 690 V number drops hard because the arc extinction physics change at higher voltage — it's still a valid rating, but you're buying this for the 240-500 V range where it earns its keep.
Built-in auxiliary and release options
Comes factory-fitted with an undervoltage release (UVR) — that's the entry — plus a 2 auxiliary switch + 1 trip alarm switch + 1 electrical alarm switch HQ configuration. That's four discrete signal outputs from one breaker: two for status (open/closed), one for trip event, one for electrical alarm. The UVR means the breaker drops out if control voltage falls below threshold, which is standard for safety circuits where a loss of control power should kill the motor. No communication function, no phase failure detection, no ground-fault monitoring — this is a straight electromechanical MCCB, not a smart breaker. The trip indicator gives a visual flag when it's tripped on fault, which speeds troubleshooting on a line.
Physical fit and panel integration
Dimensions: 86 mm deep, 105 mm wide, 181 mm high. That 105 mm width is the standard 3-pole MCCB footprint — it'll drop into a panel that was laid out for a 3-pole SENTRON 3VA frame without re-drilling. The depth at 86 mm means it clears most 200 mm deep enclosures with room for wiring behind it. Designed for screw-mounting on a backplate, not DIN rail — typical for MCCBs at this current level.