What this MCCB carries and what it means for your panel
The Siemens SENTRON 3VA1112-5EF36-0AH0 is a 3-pole molded case circuit breaker rated for 125 A continuous current (Iu) at 40 °C, with a TM240 thermal-magnetic overcurrent release. That 125 A holds flat through 50 °C — you don't lose headroom until 55 °C, where it steps to 120 A, then 117.5 A at 60 °C, 115 A at 65 °C, and 112.5 A at 70 °C. So for a panel running at 50 °C ambient, you get the full 125 A; above that, the derating curve is already baked into the part's rating table. Interrupting capacity is the headline: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That 187 kA figure at 240 V covers high-fault utility feeds or transformer secondaries where the available fault current is substantial — a standard MCCB wouldn't hold. The 121 kA at 415 V is the number most European industrial panels care about; it means this breaker clears a bolted fault on a 400 V distribution bus without upstream fuses needing to open. Rated insulation voltage is 800 V, so it's comfortable on 690 V line-to-line systems. The front carries IP40 protection — fine for a closed panel, not for washdown. Depth is 70 mm, width 76.2 mm, height 130 mm; that 76.2 mm width is a standard 3-pole MCCB footprint on a DIN rail or mounting plate.
Auxiliary contacts and trip signaling
This version ships with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration). The trip alarm switch changes state only when the breaker trips on fault — not on manual open — so a PLC or annunciator gets a dedicated fault signal separate from the run/stop status. That saves an external relay or a second contact block. The TM240 release is fixed, not adjustable for long-time pickup, but the long-time delay (tr max) is set to 1 second. That's a standard motor-start curve tolerance — it rides through inrush without nuisance tripping while still clearing a sustained overload.
How it compares to the 3VA1010-2ED32-0JA0
The 3VA1010-2ED32-0JA0 is a smaller-frame SENTRON MCCB — lower continuous current and interrupting ratings. The 3VA1112-5EF36-0AH0 carries a 125 A frame with 187 kA interrupting at 240 V, while the 3VA1010-2ED32-0JA0 is a 100 A frame with a lower interrupting capacity. The 3VA1112 will not drop into a panel wired for the 3VA1010 without checking bus-bar spacing and lug size — the frame depth and terminal layout differ. If your BOM calls for the 3VA1010, the 3VA1112 is not a direct mechanical swap; you'd need to re-evaluate the mounting and conductor terminations.