The Siemens SENTRON 3VA1180-4EF36-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 80 A continuously at 40–50 °C ambient without derating. Above 55 °C the current tapers to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C — so if this breaker lives in a hot enclosure, the actual load must be trimmed accordingly. Breaking capacity is the headline number for a line-side MCCB: 121 kA at 240 VAC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 121 kA figure at 240 V means it can interrupt a bolted fault on a high-capacity transformer secondary without the arc re-striking — critical for SCCR compliance on the panel nameplate. Rated insulation voltage is 800 V, so the breaker is electrically rated for 690 VAC systems with headroom. The 70 mm depth and 76.2 mm width fit the standard SENTRON 3VA footprint — it occupies the same DIN-rail or screw-mount slot as other 3VA frames, which simplifies panel layout when swapping ratings.
Built-in undervoltage release and auxiliary switch complement
This variant ships with an undervoltage release (UVR) factory-fitted — the UVR trips the breaker when control voltage drops below a threshold, which is standard for safety circuits that need a loss-of-voltage automatic disconnect (e.g., emergency-stop chains or machine-guarding interlocks). The auxiliary switch complement is two form-C auxiliary contacts plus one trip-alarm switch (HQ), giving the panel builder three separate signal paths for status feedback to a PLC or indication lamp. No communication module or ground-fault monitoring is included on this order code — it is a pure line-protection breaker with undervoltage release. If remote trip indication or earth-leakage detection is needed, those are separate add-on accessories in the 3VA system.
Environmental and storage limits
Operating ambient range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. Maximum power loss at rated load is 21.7 W — a non-trivial figure for a sealed enclosure; if the panel is densely packed, that heat needs to be factored into the thermal budget.