What this MCCB carries — and what it doesn't
The Siemens SENTRON 3VA1080-4ED42-0DA0 is a 4-pole molded case circuit breaker rated for 80 A continuous current (Iu) with a TM210 thermal-magnetic overcurrent release. It's a line-protection version — meaning it's built for feeder and distribution duty, not motor branch-circuit protection. The interrupting ratings climb to 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V, so it handles high-fault utility feeds without cascading upstream. An undervoltage release (UVR) is fitted as the auxiliary release; there's no communication module, no ground-fault monitoring, and no phase-failure detection. The front carries IP40 protection — fine for a dry panel, not for washdown.
Thermal derating and panel fit
The 80 A rating holds flat from 40 °C to 50 °C, then begins a gentle slope: 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 above 50 °C, that derating curve is what governs the real ampacity, not the nameplate. Dimensions are 101.6 mm wide, 130 mm high, 70 mm deep — standard SENTRON 3VA footprint for a 4-pole frame. No auxiliary contacts are fitted, and there's no trip indicator on the front. Latching endurance is rated at 15,000 operations.