MCCB for line protection — 4-pole, 40 A, 187 kA IC at 240 V
The Siemens SENTRON 3VA1140-5EE46-0AA0 is a 4-pole molded case circuit breaker (MCCB) designed for line protection, carrying a rated current of 40 A at 40 °C and holding that rating through 50 °C before a slight thermal derating begins — 39 A at 55 °C, 38 A at 65 °C, and 37 A at 70 °C ambient. Its interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V, and 75.6 kA at 440 V — figures that place it in a high-fault-duty bracket suitable for main or feeder positions in industrial switchboards where available fault current is substantial. The TM220 overcurrent release provides thermal-magnetic protection: the thermal element handles overloads with an inverse-time curve, while the magnetic element responds to short-circuits.
Panel integration and mechanical fit
Dimensions are 130 mm height, 101.6 mm width, and 70 mm depth — the width is a standard 4-inch (101.6 mm) footprint for a 4-pole MCCB, and the 70 mm depth keeps the breaker within typical enclosure clearances for backpanel or DIN-rail mounting (the SENTRON 3VA series uses a snap-on DIN-rail adapter for tool-less installation). Maximum power loss is 10.8 W at rated load — a modest figure that allows grouping multiple breakers in a panel without excessive thermal buildup, though the 40 A derating curve above 50 °C should be checked against the enclosure's internal ambient temperature.