What this MCCB is and what the ratings mean for fit
The Siemens 3VA1140-4GF46-0AA0 is a SENTRON-series 4-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, designed for line protection in distribution panels. The TM240 thermal-magnetic release handles overloads and short circuits up to the breaker's interrupting capacity. At 240 V it interrupts 121 kA; at 415 V that drops to 75.6 kA, and at 690 V it holds at 11.9 kA — the full spectrum covers most industrial service-entrance and feeder applications. The 4-pole configuration suits three-phase-plus-neutral or dual-fed systems where all live conductors need coordinated protection.
Thermal derating and panel integration
Rated 40 A at 40 °C ambient, the breaker holds 40 A through 50 °C, then derates to 39 A at 55 °C and 37 A at 70 °C — useful when the panel runs warm or the breaker sits near other heat sources. The 70 mm depth and 101.6 mm width (4-inch standard) mean it fits a typical MCCB slot without surprises; the 130 mm height clears most 200 A–frame enclosures. IP40 on the front keeps tools and fingers out but expects a sealed enclosure for washdown areas.
Key electrical ratings at a glance
Rated insulation voltage is 800 V. Maximum power loss is 10.8 W, which matters for thermal budgeting in densely packed panels. Operating temperature range is -25 °C to 70 °C; storage range extends from -40 °C to 80 °C. No undervoltage release, no communication function, no ground-fault monitoring — this is a straight thermal-magnetic line-protection breaker, not a smart or accessory-laden device.