Siemens 3VA1080-3ED36-0HC0 — 80 A Line Protection MCCB, Current Lifecycle
The interrupting ratings are 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V — figures that govern its fault-clearing capability at the point of common coupling. The 80 A rating holds flat from 40 °C through 50 °C, then derates to 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C. In a 50 °C panel — common for enclosed switchgear — the breaker still delivers its full 80 A without derating. Above that, the thermal curve governs; a panel builder should check the ambient at the breaker location, not the room setpoint.
At 415 V — common for three-phase industrial mains in much of the world — the rating drops to 52.5 kA. At 690 V it is 7.5 kA. These figures determine whether the breaker coordinates with upstream fuses or a transformer's through-fault current.
Physical Fit and Auxiliary Options
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a 3-pole footprint that fits standard SENTRON mounting bases in distribution boards. The shunt trip (STL) is wired separately; its coil must be energized to trip the breaker remotely. The integrated auxiliary trip is order code 3VA9688-0BL30, ordered separately if a factory-fitted shunt trip is not already specified.
Temperature Range and Storage
The storage limits exceed the operating range — that governs handling during transport and warehouse idle, not running conditions.