What this MCCB carries — and what it doesn't
The Siemens SENTRON 3VA1110-5EF32-0AC0 is a three-pole molded case circuit breaker rated for 100 A continuous current (Iu) with a TM240 thermal-magnetic release. It interrupts 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V — numbers that tell you the SCCR headroom for a line-side transformer or a generator-fed bus. The TM240 release means the thermal pickup is fixed; you get a single time-band adjustment (tr max. 1 s) on the magnetic trip, not a full electronic curve. No undervoltage release, no phase-failure detection, no communication module — this is a straight-ahead line-protection breaker for a distribution board, not a motor-protection device.
Thermal derating and panel fit
The 100 A rating holds from 40 °C through 50 °C ambient; above that it steps down — 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, 90 A at 70 °C. If your panel ambient runs at 60 °C, the breaker is effectively a 94 A device, so size the downstream bus and conductor for that. Width is 76.2 mm, depth 70 mm, height 130 mm — a standard 3-pole MCCB footprint that drops into a SENTRON distribution board or a separate enclosure. The IP40 front face keeps dust out of the handle and trip-indicator window, but the body itself isn't sealed; mount it in a clean, dry enclosure or a ventilated panel.
What the auxiliary contact version gives you
This variant ships with 2 auxiliary switches (HQ type) built in. That means you get two form-C contacts for status feedback — one to signal the breaker's open/closed state to a PLC or indicator lamp, the other for a remote trip alarm. No separate add-on module needed. The auxiliary contacts are rated for the control circuit voltage; they share the same terminal block as the breaker's internal wiring.