The Siemens SENTRON 3VA1150-4EF36-0KA0 is a 3-pole molded case circuit breaker rated for 50 A continuous current (Iu) at 40 °C through 50 °C, with a slight thermal derating curve above that: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. This is a line-protection version — not a motor-protection or ground-fault variant. It has no undervoltage release, no communication function, no phase failure detection, and no auxiliary contact.
The 3VA1150-4EF36-0KA0 delivers interrupting capacities of 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. At 415 V — a common industrial distribution level — that 75.6 kA gives substantial headroom above most transformer-fed fault currents, simplifying coordination with downstream breakers.
Mechanical integration — panel footprint
The 76.2 mm width (roughly 3 inches) is the standard 3-pole MCCB footprint for SENTRON 3VA frames at this rating.