SENTRON 3VA2 — line-protection MCCB with ETU850 trip unit
The Siemens 3VA2140-6KP32-0AA0 is a SENTRON-series molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous rated current of 40 A with zero derating across the full ambient range from -25 °C to 70 °C — a practical advantage when the breaker lives in a warm enclosure alongside other heat sources. The ETU850 electronic trip unit gives an adjustable overcurrent protection range of 60 A minimum to 480 A maximum, letting you set the long-time pickup to match the downstream cable or busway without swapping the breaker. Breaking capacity climbs to 242 kA at 240 V and stays at 187 kA through 415–440 V, then drops to 121 kA at 500 V and 3.7 kA at 690 V. That 242 kA figure at 240 V is the headline number for high-fault commercial service entrances; the 187 kA at 415 V covers most European industrial distribution. The sharp drop to 3.7 kA at 690 V means this frame is not intended for 690 V main feeders — verify the available fault current at your system voltage before committing the BOM line. Rated insulation voltage is 800 V, so the breaker itself is insulated for 690 V systems but the interrupting rating at that voltage is the binding constraint. The front face carries IP40 protection — suitable for inside a panel; not rated for washdown or outdoor exposure without an enclosure.
Panel fit and integration
The 3VA2140-6KP32-0AA0 measures 105 mm wide, 181 mm tall, and 86 mm deep — a 3-pole frame that occupies a standard MCCB cutout in a distribution board. No undervoltage release is fitted, and there is no voltage-trip accessory on board. A communication function is present, and the breaker includes an other measurement function, meaning it can report current and power data over the SENTRON communication bus — useful for energy monitoring without an external transducer. The trip indicator is absent, so there is no local mechanical flag showing the breaker has tripped on fault — rely on the communication output or a separate auxiliary contact. Power loss at rated current is 1.6 W, negligible for panel thermal budgeting.