What this MCCB delivers for the panel
The Siemens SENTRON 3VA1080-3ED36-0DH0 is a 3-pole molded case circuit breaker rated 80 A at 40 °C, sized for line protection in distribution panels. Its 75.6 kA breaking capacity at 240 V and 52.5 kA at 415 V give it the headroom to clear high-fault scenarios without cascading upstream — critical for selectivity studies on industrial feeders. The 800 V rated insulation voltage supports 690 V line-to-line systems, and the undervoltage release (UVR) integrated as the auxiliary release lets you drop the breaker on loss of control voltage, a common requirement for safety circuits.
Current rating and thermal derating
Rated 80 A at 40 °C, the breaker holds that full rating through 50 °C. Above that it derates linearly: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C (–). If your panel ambient runs above 50 °C, the 80 A frame still works but you need to account for the 2–6 A drop in continuous current. The maximum power loss of 21.7 W is manageable for a standard DIN-rail enclosure but worth checking against the cabinet thermal budget in high-density layouts.
Breaking capacity across voltages
The interrupting ratings span the common industrial voltages: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V (–). The steep drop above 440 V means that on 690 V systems this breaker is suited only for low-fault locations or where upstream current-limiting devices keep the prospective fault below 7.5 kA. For 400 V class panels (415 V nominal) the 52.5 kA figure covers most transformer-fed services.
Integrated auxiliary and release options
Factory-fitted with 2 auxiliary switches plus a trip alarm switch (HQ) and an undervoltage release (UVR). The UVR is the auxiliary release type — it trips the breaker when control voltage drops below a threshold, which is standard for emergency-stop and undervoltage protection schemes. The trip indicator gives a visual flag on the breaker face, speeding fault isolation during commissioning or troubleshooting.
Mechanical fit and environmental range
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. The 3-pole width (76.2 mm) is standard for SENTRON 3VA frames — it fits the same DIN-rail footprint as other 3VA three-pole breakers, so swapping into an existing panel that was laid out for a 3VA1110 variant is straightforward as long as the lug positions and busbar spacing match. Operating temperature range -25 °C to 70 °C, storage from -40 °C to 80 °C.