MCCB with ETU350M — 100 A continuous, 187 kA interrupting at 240 V
The Siemens SENTRON 3VA2110-5MN36-0AB0 is a 3-pole molded case circuit breaker (MCCB) in the motor protection version, rated for 100 A continuous current at 40 °C and carrying a 187 kA interrupting capacity at 240 V. The ETU350M electronic trip unit provides phase failure detection and adjustable protection curves suited for motor branch circuits. Rated insulation voltage is 800 V, and the breaker delivers 45 W at AC-3 duty at 400 V per the datasheet.
Interrupting capacity across voltage — selectivity headroom
At 415 V and 440 V the breaker holds 121 kA, dropping to 75.6 kA at 500 V and 17 kA at 690 V. That 121 kA at 415 V gives solid selectivity headroom for most industrial distribution panels — the SCCR stays high enough to coordinate with upstream feeders without cascading. The 17 kA at 690 V is still adequate for 690 V line-ups, but verify the available fault current at that voltage.
Thermal derating — continuous current vs ambient
The breaker holds 100 A from 40 °C through 50 °C. At 55 °C it derates to 96 A, then 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. If the panel ambient runs above 50 °C, size the load at the derated figure — the ETU350M will still trip correctly, but the continuous rating is what governs thermal rise in the enclosure.
Panel fit — dimensions and auxiliary contacts
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA frame size that fits existing 3VA panel cutouts and DIN-rail mounting. It ships with 2 auxiliary switches (HP type) built in, so no separate aux block is needed for status feedback. No undervoltage release, no ground-fault monitoring, and no communication function on this variant — keep that in mind if the spec calls for shunt trip or Modbus.