Integrator note — 125 A fixed, 4-pole, line protection
Breaking capacity scales with system voltage: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, 17 kA at 690 V. Rated insulation voltage 800 V.
Thermal derating — continuous current vs ambient
Full 125 A holds through 50 °C ambient. Above that it steps down: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, 223 A at 70 °C. If the panel sits near a heat source or in a non-conditioned enclosure, use the 55 °C or 60 °C column for sizing.
Integrated auxiliaries — what comes on the breaker
Envelope: 158 mm height, 140 mm width, 70 mm depth. The supplied basic switch variant is 3VA12255FF420AA0 — that's the bare breaker core; this order code adds the UVR and aux switches in one configurable assembly.