What this MCCB is and what it does
The Siemens 3VA1180-6EF46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 80 A continuous at 40 °C, with a thermal-magnetic TM240 overcurrent release designed for line protection — meaning it protects cables and busbars from overload and short-circuit, not motor loads with high inrush. Breaking capacity is the headline here: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA at 690 V — that's a high-interrupting rating that handles utility-grade fault currents without cascading upstream breakers.
Thermal derating and panel fit
The 80 A rating holds flat from 40 °C to 50 °C, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C — so in a sealed, uncooled enclosure you lose about 6 A at the top of the ambient range. Dimensions are 130 mm high, 101.6 mm wide, 70 mm deep — that's a 4-inch wide footprint, so it takes the same panel cutout as a standard 4-pole MCCB from the 3VA family. The front face carries IP40 protection, fine for a dry electrical room but not for washdown areas.
Sourcing and lifecycle
Lifecycle status is current — no end-of-life notice, no last-time-buy window. This is a standard catalog line item from Siemens SENTRON, so it's specified into new panels without a substitution risk.