It carries a continuous rating of 20 A at 40 °C, holds that same 20 A all the way up to 55 °C, then derates to 19 A at 60–70 °C. That thermal curve means it handles a full 20 A load in most ventilated enclosures without nuisance tripping. Interrupting capacity is where this frame earns its keep: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That's a high-interrupting frame — it clears severe faults without cascading upstream, which matters when the transformer or generator can dump serious current into a bolted fault. The auxiliary switch block is built as two HQ auxiliary switches, and the basic switch variant is 3VA11203EF320AA0.
The 3VA1120-3EF32-0AC0 measures 130 mm tall, 76.2 mm wide, and 70 mm deep — a compact 3-pole MCCB footprint that fits standard Siemens SENTRON mounting plates and busbar systems. Width is 3 inches exactly, which is the standard MCCB pole pitch for panel layout. Depth of 70 mm (2.76 in) leaves room for rear busbar connections in a typical 200 mm deep enclosure.
For BOM freeze or compliance documentation needs: the SENTRON series carries UL, CSA, IEC, and CE certifications as standard. RoHS and REACH declarations are available through the Siemens support portal. No special compliance documentation is required beyond the standard manufacturer declarations.