What this MCCB carries — and what the ratings mean for the panel
The Siemens 3VA1080-4ED32-0JA0 is a SENTRON molded case circuit breaker (MCCB) in the line protection version, meaning it is configured for feeder and distribution protection rather than motor or generator duty. Rated continuous current Iu is 80 A, and the breaker holds that rating across the 40 °C to 50 °C ambient band without derating; at 55 °C it steps down to 76.8 A, and at 70 °C it reaches 72 A — useful to know if the panel runs hot or sits near other heat sources. Breaking capacity is specified at four voltage levels: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. That 75.6 kA at 415 V is the figure most relevant for a 400 V three-phase distribution board — it tells you the breaker can safely interrupt a fault current up to that level without cascading upstream, which is the core selectivity question when coordinating with a main breaker. The overcurrent release is a TM210 — a thermal-magnetic fixed-trip design, not an electronic one, so there is no adjustable long-time or short-time pickup. That simplifies specification: you get a fixed 80 A thermal element and a magnetic instantaneous trip set at 10× Iu (800 A). No communication function, no phase-failure detection, no ground-fault monitoring — this is a straightforward distribution breaker, not a power-monitoring device.
Mounting and integration — what fits where
The 3VA1080-4ED32-0JA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. Front-face protection is IP40. The shunt trip (STL) is included as the design of the auxiliary release — this allows remote tripping via a control voltage, which is typical for emergency-stop circuits or interlocking schemes. No undervoltage release is fitted, so the breaker will not automatically open on loss of control power; if that function is needed, the ordering code would differ.