What this MCCB delivers — and what the ratings mean for your panel
The Siemens SENTRON 3VA1080-4ED32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection — meaning it sits at the feeder or branch to protect cables and busbars from overload and short-circuit, not a motor starter. Its 80 A continuous current at 40 °C is the number to size your load against; the breaker carries that rating all the way up to 50 °C, so you get full ampacity in a warm enclosure without derating until 55 °C. The interrupting capacity of 121 kA at 240 V gives you serious fault-clearing headroom for high-available-fault panels — common in industrial switchboards near large transformers. At 415 V it still breaks 75.6 kA, and at 690 V it holds 11.9 kA, so the same breaker can serve 400 V and 690 V distribution without swapping frames.
Built-in auxiliaries and release — what you get in the frame
This variant ships with a shunt trip (STL) release and two auxiliary switches plus one trip-alarm switch HQ. The shunt trip lets you remotely trip the breaker from a PLC or E-stop circuit — useful for safety interlocks or load-shedding schemes. The auxiliary switches give status feedback (open/closed) to a controller or HMI; the trip-alarm switch signals a fault trip separately from a manual open. All three are factory-installed, so you don't lose DIN-rail space adding them later. The breaker also carries a voltage-trip indicator and a mechanical trip indicator for quick visual fault identification on the panel face.
Dimensions and panel fit
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures. The 76.2 mm width (3 inches) matches the typical 3-pole MCCB slot in a switchboard; the 70 mm depth leaves room for rear-connected busbars or cable lugs. Power loss is 19.2 W maximum, so factor that into your enclosure thermal calculation if the panel is densely packed.
Environmental and electrical ratings
Rated insulation voltage is 800 V, giving you margin for 690 V systems. The breaker operates from -25 °C to 70 °C and stores from -40 °C to 80 °C — fine for unheated warehouses or outdoor cabinets in moderate climates. No ground-fault monitoring and no communication function on this variant; it is a straightforward thermal-magnetic line-protection breaker with shunt trip.