The Siemens 3VA1112-5EF32-0AF0 is a SENTRON molded case circuit breaker (MCCB) rated for 125 A continuous current (Iu) across ambient temperatures up to 50 °C, then derating linearly to 112.5 A at 70 °C. That 125 A figure is the headline for BOM fit — it sets the upstream conductor and downstream load current the breaker must carry without tripping under normal conditions. Breaking capacity is the real differentiator here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That keeps the part simple and reliable for line-protection duty where you don't need selective coordination curves or remote monitoring. The 1 auxiliary switch + 1 trip alarm switch (HQ version) provides local status feedback and a separate alarm contact for the trip event.
Width is 76.2 mm, depth is 70 mm. Front IP40 rating. No undervoltage release, no shunt trip, no communication function — this is a pure thermal-magnetic MCCB for basic overcurrent protection. If your design requires remote trip or undervoltage lockout, you'll need a different variant or an add-on accessory.