The Siemens 3VA1180-5EF36-0BA0 is a 3-pole SENTRON molded case circuit breaker rated for 80 A continuous current at 40 °C ambient, with a TM240 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR). The 70 mm depth and 76.2 mm width keep it within the standard SENTRON 3VA footprint, so it bolts into existing 3VA busbar and mounting kits without re-drilling the panel.
Thermal derating — what the 80 A rating actually means at elevated ambient
Above 50 °C the TM240 release begins to derate: 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C. If your panel ambient sits at 55 °C — common in a cement plant control room or a hot MCC lineup — you design for 76.8 A continuous, not the label 80 A. That temperature span covers outdoor enclosures in a northern winter or a roof-mounted panel in summer.
What you don't get — and why it matters for the spec
No trip indicator, no auxiliary contacts, no communication function, no phase-failure detection, no ground-fault monitoring. This is a bare line-protection MCCB with an undervoltage release and a TM240 thermal-magnetic trip. If your panel requires remote status feedback or ground-fault alarm, you add an external auxiliary switch or a separate ground-fault relay. The IP40 front protection means it's sealed against tools and fingers on the front face, but the rear terminals are open to the panel — standard for switchboard mounting.