What this MCCB is and what it does
The Siemens SENTRON 3VA2110-7MS36-0AH0 is a 3-pole molded case circuit breaker (MCCB) with a rated continuous current Iu of 100 A, designed for starter protection duty. It carries the ETU310M electronic trip unit, which provides adjustable overload and short-circuit protection curves suited to motor and feeder circuits. Breaking capacity is the headline here: 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 numbers mean this breaker can interrupt fault currents up to those levels without welding or rupturing — critical for high-fault installations like transformer secondaries or large motor control centers where upstream coordination demands a high-interrupting device. Current rating holds flat at 100 A from 40 °C through 50 °C ambient, then derates gradually to 90 A at 70 °C. If your panel runs hot — say, a packed enclosure near a furnace line — that 90 A floor at 70 °C tells you the breaker still carries the load without nuisance tripping.
Integration and mounting
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. The 105 mm width fits standard distribution panel layouts. Auxiliary contact version ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type). That gives you two NO/NC pairs for status feedback to a PLC or indication lamp, plus a dedicated alarm contact that changes state only on a trip event — useful for remote fault annunciation without wiring through the aux contacts.
What the ratings mean for a procurement decision
The 100 A continuous rating at 40 °C through 50 °C is the number to match against your load's full-load amps. If your motor draws 95 A FLA, this breaker holds at 100 A with headroom; if your ambient hits 70 °C, the 90 A derated figure still covers it. The 330 kA at 240 V breaking capacity is the SCCR (short-circuit current rating) the breaker brings to the panel — it lets you place this MCCB on a bus with up to 330 kA available fault current without needing a current-limiting fuse upstream. Starter protection version means the trip unit is configured for motor-starting duty — it tolerates the inrush without nuisance tripping on the thermal curve while still providing short-circuit protection. The ETU310M is an electronic trip unit with adjustable settings; the base switch supplied is the 3VA2110-7MS36-0AA0.