100 A MCCB with 330 kA Breaking Capacity at 240 V
The Siemens SENTRON 3VA2110-7MS32-0JA0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current of 100 A. Its breaking capacity hits 330 kA at 240 V, dropping to 242 kA at 415 V and 440 V, then 187 kA at 500 V, and still holds 52.5 kA at 690 V — meaning the part handles high-fault utility feeds and transformer secondaries where the available fault current is substantial, not just motor branch circuits. The ETU310M electronic trip unit provides adjustable overload and short-circuit protection curves, and the shunt trip (STL) allows remote tripping via a control signal, which is useful for emergency-stop integration or interlocking schemes.
Thermal Derating and Operating Envelope
The 100 A rating holds from 40 °C up through 50 °C — no derating needed in a typical 50 °C panel. At 55 °C it drops to 96 A, at 60 °C to 94 A, and at 65 °C to 92 A, finally settling at 90 A at 70 °C. The operating temperature range runs -25 °C to +70 °C, with storage from -40 °C to +80 °C. Maximum power dissipation is 75 W. The 105 mm width, 181 mm height, and 86 mm depth fit standard Siemens 3VA mounting footprints; verify busbar and lug clearance before panel layout.