Siemens SENTRON 3VA2063-4JQ32-0AA0 — 63 A MCCB, Line Protection, Current Production
Its interrupting capacity hits 121 kA at 240 V and 75.6 kA at 415 V, which means it can safely clear high-fault currents on a 400 V distribution bus without upstream coordination issues. Rated insulation voltage is 800 V, and it operates from -25 °C to 70 °C, with storage from -40 °C to 80 °C. Maximum power loss is 5.4 W.
Interrupting Capacity and Thermal Ratings
The interrupting capacity is flat at 75.6 kA across 415 V and 440 V, then drops to 52.5 kA at 500 V and to 3 kA at 690 V. For a 400 V panel with a transformer-fed secondary, the 75.6 kA rating gives headroom for most industrial distribution boards. The adjustable thermal-magnetic trip band starts at 16 A initial value, with a maximum of 756 A and minimum of 95 A.