What this MCCB does on the line
Continuous current rating holds at 20 A from 40 °C through 55 °C ambient, then derates to 19 A at 60 °C and 65 °C — useful if the breaker lives in a warm enclosure or next to other heat sources. Interrupting capacity reaches 121 kA at 240 V, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500 V and 690 V — the 121 kA figure at 240 V means it can clear a high-fault utility transformer secondary without upstream fuses, but at 480/500 V systems the available fault current must stay under 11.9 kA.
Thermal-magnetic release and internal configuration
Trip indicator present on the front face — a visual flag or window shows whether the breaker tripped on fault versus being manually switched off, which speeds fault isolation on a panel walk-down. If you need UVR, GFCI, or Modbus, you add external accessories or step to a 3VA2 electronic-trip variant.
Rated insulation voltage 800 V — the breaker's internal creepage and clearance are designed for 800 V systems, so it can be used on 690 V line-to-line circuits with margin.