What the ratings mean for your panel
The Siemens SENTRON 3VA2110-6HN36-0JL0 is a 3-pole molded case circuit breaker rated for 100 A continuous current at 40 °C, with the ETU350 electronic trip unit handling line protection. That 242 kA interrupting rating at 240 V is the key number for a low-voltage main breaker — it tells you this MCCB can safely clear a fault up to that level without the arc flashing over or the case rupturing, so it belongs in a high-fault-current position like a transformer secondary or a service entrance. At 415 V and 440 V it still holds 187 kA, dropping to 121 kA at 500 V and 5 kA at 690 V. The 86 mm depth and 105 mm width fit standard SENTRON 3VA panel cutouts, so it drops into an existing MCCB slot without re-drilling the gland plate.
Thermal derating and real-world current
The 100 A rating holds flat from 40 °C to 50 °C, then steps down: 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C. If your panel ambient runs above 50 °C, plan for that derate curve — the breaker won't trip early, but the continuous load limit drops. The 10 W maximum power loss is the heat it dumps into the enclosure; factor that into your thermal budget if you're stacking several MCCBs in a sealed box.
Auxiliary contacts and shunt trip
This variant ships with 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ type), plus a shunt trip (STL) for remote opening. The integrated auxiliary trip module is order code 3VA9688-0BL32; the basic switch is 3VA2110-6HN36-0AA0. No undervoltage release, no ground fault monitoring, no phase failure detection, no communication function — it's a straight line-protection breaker with remote-trip capability. The 20,000-cycle mechanical endurance is typical for an MCCB in a distribution panel that sees a few operations per year; not for a frequent-switching application.