What this 4-pole 125 A MCCB brings to the panel
It's built for line protection in distribution panels where you need solid interrupting capacity: 121 kA at 240 V, 75.6 kA at 415 V, and still 11.9 kA at 690 V. The thermal-magnetic TM240 release handles overloads and short-circuits in one package — no electronic adjustments, which means fewer things to go wrong out in the field. Power loss maxes out at 28.1 W, so panel heat buildup is manageable even in a packed enclosure.
Sizing and derating for real-world conditions
At 55 °C it derates to 122 A, at 60 °C to 120 A, at 65 °C to 117 A, and at 70 °C to 114 A. The 4-pole design with 100 % N-conductor protection means the neutral pole is fully rated and trips with the phase poles — no derating or special coordination needed for the neutral path.
For compliance documentation, the SENTRON 3VA series carries UL, IEC, CSA, and CE certifications per standard Siemens practice. Specific declaration files (RoHS, REACH) are available through the manufacturer's support portal.
The 3VA1112-5EE32-0AA0 is a 3-pole version with an electronic trip unit, while this 4-pole unit uses a thermal-magnetic TM240 release. If your panel was wired for a 3-pole breaker with electronic adjustments, swapping to this one means losing the adjustable trip curve and adding a neutral pole that needs to be landed. Same frame size — the 70 mm depth and 101.6 mm width are identical — so it physically fits the same mounting footprint, but the wiring and protection philosophy are different.