What this MCCB does and where it fits
The Siemens 3VA2110-5MN32-0JL0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for motor protection, with a continuous current rating of 100 A and an interrupting capacity of 187 kA at 240 V — enough to handle high-fault utility feeds or large transformer secondaries without cascading upstream. The ETU350M electronic trip unit provides adjustable overload and short-circuit protection, plus phase failure detection, so it catches a lost phase before the motor cooks. A shunt trip (STL) is built in for remote emergency-off or PLC-driven drop-out. The auxiliary contact package includes 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch — enough to signal status back to a PLC or annunciator panel without adding a separate block.
Selectivity and coordination — the numbers that matter
The interrupting ratings step down cleanly with voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. That 121 kA at 415 V is the figure to check for a 400 V distribution board — it gives headroom for most transformer-fed installations without needing a current-limiting fuse upstream. The rated insulation voltage is 800 V, so the breaker is rated for 690 V systems as well. Thermal derating is minimal up to 50 °C (still 100 A), then drops to 96 A at 55 °C, 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 accordingly.
Mounting and integration
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard SENTRON 3VA2 frame size that fits the usual panel cutout and bus-bar spacing. The breaker accepts plug-in or fixed connections; the shunt trip and auxiliary switches are factory-integrated, so no field wiring of separate accessories. The 75 W maximum power loss at full load means the panel ventilation should account for that heat, especially if several breakers are ganged in a closed enclosure.