SENTRON 3VA1140-5EF32-0JC0 — 40 A MCCB with shunt trip, 187 kA IC at 240 V
The Siemens SENTRON 3VA1140-5EF32-0JC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. It carries 40 A continuously at 40 °C ambient, with a 187 kA breaking capacity at 240 V AC — enough to handle high-fault utility feeds or transformer secondaries without cascading upstream. The 121 kA at 415 V and 75.6 kA at 440 V still cover most industrial distribution panels. At 500 V and 690 V the rating drops to 17 kA, so verify your available fault current if this breaker lands on a 480 V or 600 V bus. A shunt trip release (STL) is factory-fitted, so you can remotely trip the breaker via a control signal — useful for emergency-stop circuits or fire-safety interlocks. Two HQ auxiliary switches are also installed, giving you status feedback (open/closed) for the PLC or panel indication without adding a separate accessory block. The breaker is 70 mm deep, 76.2 mm wide, and 130 mm tall — a standard SENTRON 3VA footprint that fits the same panel cutouts and busbar arrangements as other 3VA frame sizes. The 10.8 W maximum power loss at rated load is modest; no special ventilation is needed in a typical enclosed panel.
Key ratings and what they mean for your panel
The 40 A rating holds across 40 °C to 50 °C ambient (no derate needed in that range). At 55 °C it drops to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A. If your panel runs hot — say near a furnace or in a poorly ventilated enclosure — check the thermal curve against your actual load current. Insulation voltage is rated 800 V. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. No undervoltage release is fitted, and no ground-fault monitoring version is included. If you need UVR or GF protection, you would add an external module or select a different 3VA variant. The breaker has no communication function — it is a standalone thermal-magnetic MCCB, not a smart breaker.