It carries a 121 kA breaking capacity at 240 V AC, dropping to 75.6 kA at 415 V and 52.5 kA at 440 V — figures that tell you the interrupting capability at your service voltage.
Current Derating and Thermal Performance
At 55 °C it drops to 98 A, then 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C (–).
Breaking Capacity by Voltage — What It Means for Selectivity
The 121 kA at 240 V is the headline number, but the 75.6 kA at 415 V and 52.5 kA at 440 V are the ones that govern most industrial panels. For a 400 V service with a transformer capable of 65 kA fault current, this breaker clears it with margin. Below 415 V the 75.6 kA figure supports selective coordination with downstream 25 kA or 36 kA rated MCBs, provided the let-through energy curves overlap correctly.
The 3-pole footprint matches standard SENTRON 3VA mounting rails and busbar systems. No DIN-rail clip — these bolt directly to the mounting plate or plug onto a busbar adapter.