What this MCCB is and what it does
The Siemens SENTRON 3VA1180-4EF46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated 80 A at 40 °C, designed for line protection in distribution panels. It carries a 121 kA breaking capacity at 240 V, dropping to 75.6 kA at 415 V and 52.5 kA at 440 V — figures that govern its fault-interruption capability in a given system voltage. The TM240 overcurrent release means it uses a thermal-magnetic trip unit, so it handles both sustained overloads (thermal) and short-circuit events (magnetic) without external control power.
Current ratings and thermal derating
Rated 80 A continuous at 40 °C, the 3VA1180-4EF46-0AA0 holds that rating through 50 °C. Above that, it derates: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. The maximum operating ambient is 70 °C; minimum is -25 °C. Storage range is -40 °C to 80 °C. Maximum power loss is 19.2 W — relevant for enclosure thermal calculations when the breaker is fully loaded in a sealed panel.
Breaking capacity by voltage
Breaking capacity varies with system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. The rated insulation voltage is 800 V. These values determine where the breaker can be applied for fault-clearing without upstream coordination issues — the 121 kA figure at 240 V is high enough for most low-voltage transformer secondaries.
Physical fit and panel integration
Dimensions: 130 mm height, 101.6 mm width, 70 mm depth. IP40 on the front — suitable for indoor panel mounting where no washdown or dust ingress is expected. The 4-pole footprint matches standard Siemens SENTRON 3VA panel cutouts; verify busbar and lug spacing against the existing panel layout before ordering.