What this MCCB delivers in the panel
The Siemens SENTRON 3VA1080-3ED42-0BH0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, sized for a 70 mm depth and 101.6 mm width on the DIN rail. At 40 °C it carries 80 A continuous; the breaking capacity reaches 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — figures that govern selectivity coordination downstream. The 800 V rated insulation voltage means it can be applied in 480 V and 600 V class systems without derating the insulation path. The unit ships with an undervoltage release (UVR) fitted and a factory-installed auxiliary switch block: two auxiliary switches plus one trip alarm switch (HQ). That combination covers remote status and undervoltage trip on a single breaker — no separate add-on modules to order for basic signaling.
Thermal derating and real-world current
The 80 A rating holds flat from 40 °C through 50 °C. At 55 °C it derates to 78 A, at 65 °C to 75 A, and at 70 °C to 74 A. For a panel with ambient at 50 °C, the breaker delivers its full 80 A; above that, the derating curve governs the load you can protect. Maximum power loss is 21.7 W — relevant for enclosure heat-rise calculations when multiple breakers are ganged.
Environmental and storage limits
Operating temperature range is -25 °C to 70 °C. Storage range is wider: -40 °C to 80 °C — the storage limits govern handling and warehousing, not running conditions. The trip indicator gives a local visual flag on the breaker face after a fault event.