The Siemens 3VA1040-4ED32-0KC0 is a SENTRON 3-pole molded case circuit breaker (MCCB) rated 40 A at 40 °C, designed for line protection. Breaking capacity hits 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that cover most industrial fault levels without cascading upstream. Insulation voltage rated 800 V. Rated current holds steady at 40 A from 40 °C through 50 °C, then derates to 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C. That means in a warm panel — say 55 °C ambient — you lose 1.6 A of headroom; factor that into the load schedule.
What the ratings mean for fit
Three poles, 40 A continuous at 40 °C, line-protection design — this MCCB is sized for a feeder or branch circuit in a 400 V distribution panel. The 121 kA at 240 V interrupting rating means it can clear a bolted fault at the service entrance without requiring a current-limiting fuse upstream. At 415 V the 75.6 kA still covers most industrial transformer ratings up to 2000 kVA. Fitted with a shunt trip release (STL) and two HQ auxiliary switches. The shunt trip lets you remotely trip the breaker via a control signal — useful for emergency-stop circuits or automated load shedding. The auxiliary switches provide status feedback (open/closed) to a PLC or annunciator panel.
Panel integration note
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. The 3-pole frame fits standard Siemens 3VA mounting bases and busbar systems. No trip indicator on the front face — status is read from the auxiliary switches or the handle position.