What this MCCB carries — and what it doesn't
The Siemens 3VA2110-6HN32-0KL0 is a SENTRON molded case circuit breaker, 3-pole, rated 100 A continuous at 40 °C through 50 °C, then derated stepwise to 85 A at 70 °C. That 100 A holds across the panel's typical ambient range — you only lose headroom above 55 °C, where it drops to 96.25 A. The ETU350 electronic trip unit gives you adjustable overload and short-circuit protection, not just thermal-magnetic fixed curves. Breaking capacity hits 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 5 kA at 690 V — so the 240 V figure is the headline, but the 415 V / 440 V numbers are what matter for most European and Asian distribution panels. The shunt trip (STL) release is integrated; the auxiliary contact complement is 2 aux switches + 1 trip alarm + 1 electrical alarm switch (HQ version). No undervoltage release, no communication module, no phase-failure detection — this is a straight line-protection breaker with remote trip capability.
Breaking capacity — where the number actually lands
The 242 kA at 240 V is the maximum short-circuit rating, but that's a North American utility-secondary number. For 400 V-class systems (the common IEC distribution voltage), the relevant figure is 187 kA at 415 V and 440 V. At 500 V it's still 121 kA. Only at 690 V does it drop to 5 kA — so this breaker is not intended for 690 V main feeders. If your fault-current study shows available current above 187 kA at 400 V, you need a different frame or a current-limiting upstream device. The ETU350 trip unit can be set to coordinate with downstream breakers for selective coordination (zone-selective interlocking is not listed, but the electronic trip allows curve shaping).
Panel fit — dimensions and integration
Width 105 mm, height 181 mm, depth 86 mm. That's a standard 3VA2 frame footprint — it drops into the same mounting cutout as other 3VA2 breakers. The shunt trip adds a pair of control wires; the auxiliary contact block (2 aux + 1 trip alarm + 1 electrical alarm) occupies the accessory slot. No communication module, so no wiring for bus or gateway. The 10 W maximum power loss is manageable in a sealed enclosure but should be factored into thermal calculations if the panel is densely packed.
What's inside — trip unit and accessories
The ETU350 is an electronic trip unit with LSI protection curves (long-time, short-time, instantaneous). It's field-replaceable — the basic switch is order code 3VA2110-6HN32-0AA0, and the integrated auxiliary trip is 3VA9688-0BL33. The shunt trip (STL) is built in, so you get remote tripping via a control voltage. No undervoltage release, no ground-fault monitoring, no communication. The 20 000 mechanical endurance cycles (latching) is typical for a 100 A MCCB frame — fine for distribution duty, not for frequent switching.