What this MCCB is and where it lands
The Siemens 3VA1110-5EF32-0AF0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current across a 3-pole configuration, carrying a TM240 thermal-magnetic overcurrent release. It lands in distribution panels, motor control centers, and feeder circuits where the line protection version handles overload and short-circuit faults without undervoltage or ground-fault monitoring. The 70 mm depth and 76.2 mm width fit standard DIN-rail or panel-mount layouts, so it drops into existing SENTRON or 3VA-family enclosures without re-spacing gland plates.
Breaking capacity — the number that decides selectivity
This MCCB delivers 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. For a site electrical engineer coordinating a panel, the 415 V figure is the one that governs most industrial feeder applications in 400 V class systems — it determines whether the breaker clears a bolted fault before the upstream device sees it. The 690 V rating drops to 17 kA, which still covers most 690 V motor circuits but needs a selectivity study if the available fault current exceeds that.
Thermal derating — don't size by the nameplate alone
The 100 A rating holds flat 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. A panel builder stuffing this into a high-ambient enclosure — say, a non-vented MCC bucket near a drive — must apply that curve. The TM240 release is adjustable for the long-time pickup, so you can fine-tune the trip point within the thermal-magnetic band without swapping the breaker.
Auxiliary contacts and status feedback
It ships with one auxiliary switch plus one trip alarm switch (HQ version), so a controls integrator gets both a position-following contact and a separate alarm that triggers only on a fault trip — not on manual open. The trip indicator on the front gives the field service tech a quick visual check without needing a meter. No communication module, no phase-failure detection, and no undervoltage release are fitted on this variant.