The Siemens 3VA2110-5MN32-0BC0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current (Iu) in a 3-pole configuration, purpose-built for motor protection with the ETU350M electronic trip unit. It carries a rated insulation voltage (Ui) of 800 V and delivers a breaking capacity of 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — these numbers tell you the fault levels it can safely interrupt at each voltage, which is the first thing to check against your transformer and upstream breaker coordination study.
Ratings that decide the fit
The 100 A frame holds that rating across the 40 °C to 50 °C band, then derates to 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C (–). If your panel ambient runs above 50 °C, size the load at the derated figure — not the nameplate 100 A. The operating temperature range is -25 °C to +70 °C, with storage from -40 °C to +80 °C. Power loss maxes at 75 W — that's heat that stays in the enclosure, so factor it into your thermal budget if the panel is tightly packed. The breaker includes an undervoltage release (UVR) and phase failure detection, both standard on the motor-protection version. Auxiliary contacts are two HQ switches. No communication function or ground-fault monitoring on this variant.
Panel fit
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. That 105 mm width is a standard 3-pole MCCB footprint for this frame size — it mounts on a DIN rail or can be screw-fixed to a backplate. The depth of 86 mm means it clears most standard enclosure depths, but check your gland plate clearance if the breaker sits near the door.