The Siemens 3VA1112-6MH36-0CC0 is a 3-pole IEC frame 160 circuit breaker from the 3VA1 series, rated at 125 A with a breaking capacity class H — Icu=70kA @ 415V. This puts it squarely in the high-interrupting category for industrial panel feeders and motor branch circuits where fault currents can exceed 50 kA. The TM120M thermal-magnetic release provides starter protection (motor branch-circuit protection per IEC 60947-4-1), with an adjustable magnetic trip Ii=5...15 x In, meaning you can set instantaneous pickup between 625 A and 1875 A to coordinate with downstream contactors and overload relays.
For a 125 A feeder on a 415 V distribution board with transformer impedance giving a prospective fault current in that range, this breaker clears it without cascading upstream. The class H designation (70 kA) is the highest in the 3VA1 frame 160 lineup; standard class N (36 kA) and class S (50 kA) siblings exist if your SCCR study shows lower fault levels. Note the description states 'without overload protection short-circuit protection' — this variant ships with the TM release configured for magnetic (short-circuit) only; the thermal overload function is present but the breaker is ordered without the overload protection function enabled, intended for use with a separate overload relay downstream. The adjustable Ii=5...15 x In gives flexibility to coordinate with the motor locked-rotor current. When voltage drops below about 70% of rated, the UVR trips the breaker open — standard for applications where a motor must not auto-restart after a power dip. Two auxiliary switches (HQ — high-qualified, meaning high-reliability contacts) provide status feedback to the PLC or annunciator panel.
Deployment context
The 3VA1 frame 160 is a standard panel-building component — its footprint matches Siemens's SENTRON line, so it integrates into existing busbar systems and enclosure cutouts without modification. The UVR and aux switches are factory-installed, reducing field wiring time.