What this MCCB delivers — and the ratings that decide panel fit
The Siemens SENTRON 3VA1180-3EF36-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated 80 A at 40 °C, built around a TM240 thermal-magnetic overcurrent release. That TM240 designation means the thermal trip element is fixed at 80 A, with magnetic pickup at 240 A — a combination sized for motor branch circuits or feeder protection where moderate inrush is expected. The interrupting capacity climbs to 75.6 kA at 240 V and still holds 52.5 kA at 415 V, so it clears high-fault bolted shorts without cascading upstream in most industrial panel configurations. This MCCB includes a factory-fitted undervoltage release (UVR), which drops the breaker open when control voltage falls below the dropout threshold — a standard requirement for emergency-stop circuits and safety disconnects where loss of control power must remove line voltage from the load. Rated insulation voltage is 800 V. Power dissipation at full load is 21.7 W maximum.
Thermal derating — the curve that governs real-world current
The 80 A rating holds flat from 40 °C through 50 °C. Above that, the thermal element begins to pull back: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. If the breaker lives in a hot enclosure near transformers or drives, the 70 °C derated figure of 74 A is the number to use for branch-circuit sizing — not the catalog 80 A. Operating ambient range is -25 °C to 70 °C; storage tolerance extends from -40 °C to 80 °C, which covers cold warehouses and hot shipping containers without special handling.
Interrupting capacity by system voltage — selectivity planning
The 3VA1180-3EF36-0BA0 delivers 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. The steep drop above 440 V means the breaker is best applied in 240 V or 400 V class systems where its full interrupting muscle is available. At 690 V the 11.9 kA figure still covers most industrial loads but requires coordination checks if the available fault current exceeds that threshold.
Panel integration — footprint and mounting
Dimensions: 76.2 mm wide, 130 mm tall, 70 mm deep. Rated insulation voltage is 800 V.