The Siemens 3VA1080-4ED42-0AH0 is a SENTRON molded case circuit breaker (MCCB) rated for 80 A continuous current (Iu) in a 4-pole configuration, designed for line protection duty. Its TM210 thermal-magnetic release provides overload and short-circuit protection without undervoltage or ground-fault monitoring — a straightforward choice for main feeder or distribution panel protection where auxiliary functions aren't required.
Breaking capacity and thermal derating
The interrupting ratings are the headline: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. At 415 V, that 75.6 kA covers most industrial secondary-distribution fault levels without needing a current-limiting upstream device. The thermal derating curve holds a flat 80 A from 40 °C through 50 °C; above that it steps down 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. If your panel ambient runs above 50 °C, the continuous load must be trimmed accordingly.
Physical fit and panel integration
The MCCB measures 70 mm deep, 101.6 mm wide, and 130 mm high. The 101.6 mm width is a standard 4-pole MCCB footprint — it occupies four 25.4 mm (1-inch) module positions on a DIN rail or panel-mount base. The IP40 front protection means it's suitable for enclosed distribution boards; no washdown rating, so keep it behind a gland plate or cabinet door in wet environments.
Auxiliary contacts and release options
Factory-fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ type). No undervoltage release, no shunt release, no ground-fault monitoring, no communication function, and no phase-failure detection. The TM210 release is fixed — not field-interchangeable. If your application requires remote tripping or status feedback beyond the built-in alarm contact, an external add-on module would be needed.
Environmental limits
Operating temperature range is -25 °C to 70 °C; storage range extends from -40 °C to 80 °C. The rated insulation voltage (Ui) is 800 V. Mechanical endurance is listed at 15,000 operations — adequate for a main breaker cycled infrequently, but not rated for frequent switching duty.