The Siemens SENTRON 3VA1112-4EF36-0CA0 is a 3-pole molded case circuit breaker rated for 125 A continuous current at 40 °C, meaning it handles that load without derating in a typical 40 °C panel ambient. The interrupting capacity hits 121 kA at 240 VAC, 75.6 kA at 415 VAC, and still delivers 52.5 kA at 440 VAC; that 121 kA figure at 240 V is the headline number for high-fault panels downstream of large transformers.
Footprint and panel integration
The 3VA1112-4EF36-0CA0 measures 70 mm deep by 76.2 mm wide by 130 mm tall — a compact 3-pole frame that fits standard SENTRON mounting plates and busbar systems. The 15 000 mechanical endurance cycles cover the typical switching life for a line-protection breaker in a distribution board.
Thermal derating curve — the real-world current limit
Above that, the breaker derates: 120 A at 55 °C, 117.5 A at 60 °C, 115 A at 65 °C, and 112.5 A at 70 °C.