What this MCCB is and what it protects
The Siemens 3VA1180-5EF32-0AG0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. Its 80 A rated continuous current (Iu) and TM240 thermal-magnetic release mean it handles sustained loads up to 80 A and trips on overload or short-circuit — no undervoltage release, no ground-fault module, no communication function on this variant. The 3-pole design covers three-phase feeders. The interrupting ratings tell you where it can sit in the fault-current hierarchy: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That 187 kA figure at 240 V is the headline — it clears very high fault currents at low voltage, typical for large transformer-fed panels. At 690 V the rating drops to 17 kA, so verify the available fault current at your service voltage before committing the BOM line.
Thermal derating and panel fit
The breaker carries its full 80 A from 40 °C through 50 °C ambient. Above that it derates: 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 the panel ambient runs hot — say next to a drive or transformer — use the 70 °C figure (72 A) as your continuous load ceiling. The 70 mm depth and 76.2 mm width fit a standard MCCB footprint on the DIN rail or mounting plate; the 130 mm height clears most enclosure gutters. IP40 on the front means it's protected against tools and wires >1 mm — fine for a closed panel, not for washdown areas. The auxiliary contact configuration (1 auxiliary switch + 1 trip alarm switch HP) gives one NO/NC for status feedback and one dedicated alarm contact that changes state only on a trip event, useful for remote fault annunciation.