MCCB for line protection — 100 A, 3-pole, with shunt trip
The Siemens SENTRON 3VA1110-5EE32-0HC0 is a 3-pole molded case circuit breaker rated for 100 A continuous current at 40 °C ambient, with a breaking capacity of 187 kA at 240 V AC. It is designed for line protection in industrial distribution panels, with an insulation voltage rating of 800 V. The unit includes a factory-fitted shunt trip release (STL) and two auxiliary switches (HQ configuration), so it can be remotely tripped and its status signaled back to a PLC or annunciator panel — a common requirement in tire-curing press control cabinets where a fault must isolate the heater contactors before the next press cycle starts.
Current derating and thermal profile
The breaker carries its full 100 A rating from 40 °C through 50 °C ambient. Above that, it derates linearly: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. The maximum power loss is 25 W. For a panel builder laying out a gland plate near a steam line or a VFD cabinet, that derating curve means the 3VA1110-5EE32-0HC0 holds its rating in most ventilated enclosures, but if the ambient inside the panel pushes past 50 °C — common when a press controller shares space with heat-generating contactors — the load must be trimmed to match the curve. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Breaking capacity across voltages
The interrupting rating drops with system voltage: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V. That 17 kA floor at 690 V is the limiting case for high-voltage industrial networks. For a panel feeding a 480 V press line, the 75.6 kA at 440 V is the relevant figure — well above typical available fault current in most plant distribution, so the breaker is unlikely to be the weak link in the coordination study.