Sizing and selectivity — what the ratings mean in practice
The 3VA1220-5EF42-0CH0: The 200 A frame (with thermal-magnetic or electronic trip, depending on the internal trip unit) sets the continuous pass-through for a feeder or large motor branch. The 187 kA SCCR at 240 V means this breaker can be installed on a transformer secondary with a high available fault current without needing a current-limiting fuse upstream — it self-protects. At 480 V the 75.6 kA interrupting rating still covers most industrial service entrances. The 800 V rated insulation voltage (Ui) confirms the internal clearances support 690 V line-to-line systems, common in mining or marine installations.
Built-in accessories and panel integration
This variant ships with an undervoltage release (UVR) and a 2-auxiliary-switch plus 1-trip-alarm-switch HQ configuration — no need to order add-on modules for basic status feedback or shunt-trip protection. The footprint is 140 mm wide by 158 mm tall by 70 mm deep, which fits standard Siemens SENTRON mounting patterns and busbar kits. The power loss is 44.5 W maximum, so factor that into enclosure thermal calculations if grouping multiple breakers in a sealed panel.