What this MCCB carries and what it doesn't
The Siemens 3VA1112-6MH32-0CC0 is a 3-pole IEC frame 160 MCCB rated at 125 A with a class H breaking capacity of 70 kA at 415 V. That means it safely interrupts fault currents up to 70 kA at 415 V without upstream damage — a rating that suits high-fault industrial panels where standard 36 kA or 50 kA breakers would need cascading coordination. The TM120M trip unit provides starter protection: thermal-magnetic with a fixed thermal element rated 125 A and an adjustable magnetic short-circuit pickup from 5 to 15 times In (625 A to 1875 A). Note the description explicitly states "without overload protection" — this breaker is configured for short-circuit protection only; overload coordination relies on an external overload relay or motor starter. The integrated undervoltage release (UVR) operates on 120–127 V AC 50/60 Hz and will trip the breaker when control voltage drops, preventing automatic restart after a power loss. Two HQ auxiliary switches are built in, providing status feedback for the open/closed position. The nut keeper kit is included — a small but critical detail for panel builders who need captive hardware to prevent loose nuts during installation.