The interrupting capacity reaches 121 kA at 240 VAC, dropping to 75.6 kA at 415 VAC and 52.5 kA at 440 VAC — figures that define the fault-current ceiling for the downstream panel.
Ratings and thermal performance
The 50 A rating holds from 40 °C through 50 °C without derating, then steps down to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. Above that, the TM210 bimetal element responds to the higher internal temperature, so the load must be trimmed accordingly.
This MCCB's breaking capacity varies significantly with system voltage. At 240 VAC it interrupts 121 kA — sufficient for high-fault locations near a large transformer. At 415 VAC the rating is 75.6 kA, at 440 VAC it is 52.5 kA, and at 500 VAC and 690 VAC it holds at 11.9 kA. For DC applications, the manufacturer directs users to the 3VA device manual for switching power values.