What this MCCB is and where it fits
The Siemens 3VA1116-3EF32-0HC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. Its 3-pole construction and 160 A rating at 40 °C suit it for main or feeder protection in commercial and industrial switchboards. The 75.6 kA breaking capacity at 240 V gives headroom for high-fault installations, while the 52.5 kA at 415 V covers common European 400 V grids. Insulation voltage is rated at 800 V, so it can sit in 690 V systems without derating the dielectric.
Breaking capacity and thermal derating
Breaking capacity drops from 75.6 kA at 240 V to 52.5 kA at 415 V, then to 32 kA at 440 V, and further to 11.9 kA at 500 V and 690 V. That means on a 400 V system this MCCB handles 52.5 kA prospective fault current — enough for most secondary substations. Thermal derating is mild: 160 A holds from 40 °C to 50 °C, then steps down to 158 A at 55 °C, 155 A at 60 °C, 153 A at 65 °C, and 150 A at 70 °C. So in a warm enclosure at 55 °C you lose only 2 A.
Panel fit and wiring
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep. The 76.2 mm width is a standard 3-pole MCCB footprint — it fits a 3-module wide DIN-rail or panel-mount cutout. Depth of 70 mm leaves clearance for rear-connected busbars. The shunt trip and auxiliary switches are factory-installed; no field wiring of the release is needed.