The Siemens SENTRON 3VA1120-6GF46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated at 20 A continuous, with a TM240 thermal-magnetic overcurrent release. It's designed for line protection in distribution panels, sized for a 101.6 mm wide, 130 mm tall, 70 mm deep footprint — fits standard enclosure cutouts for 4-pole MCCBs.
Breaking capacity — what the numbers mean for your fault duty
This breaker clears 220 kA at 240 V AC, 154 kA at 415 V, and 121 kA at 440 V. Those are high-interrupting ratings — it handles bolted faults near the transformer secondary without upstream series protection. At 500 V and 690 V it still holds 17 kA, which covers most motor-circuit faults on 480/600 V systems. The 800 V rated insulation voltage confirms the internal spacing is built for 600 V class panels.
Thermal derating and temperature range
The 20 A rating holds flat from 40 °C through 55 °C ambient — no derating needed in a warm panel. At 60 °C and 65 °C it drops to 19 A, and at 70 °C it's still 19 A. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C. So if your panel runs hot near a furnace line or in a foundry, you lose only 1 A at the top end.
Panel integration notes
Front IP40 rated — suitable for general indoor panel use, not washdown. No undervoltage release, no communication module, no ground-fault monitoring on this variant. The TM240 release is fixed thermal-magnetic; no trip indicator. Power loss is 12 W maximum — account for that in your panel thermal budget.