SENTRON 3VA1180-4EF36-0DC0 — 80 A MCCB with Undervoltage Release
The Siemens SENTRON 3VA1180-4EF36-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection at a continuous current Iu of 80 A, with the thermal-magnetic overcurrent release designated TM240. It carries a rated insulation voltage Ui of 800 V, making it suitable for 400 VAC distribution panels in industrial and commercial installations. Breaking capacity is substantial: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. These figures cover high-fault scenarios typical of transformer secondaries and large motor control centers — the 415 V rating alone handles most European industrial supply points without cascading upstream. The breaker ships with an integrated undervoltage release (UVR) and two HQ auxiliary switches (order code 3VA9608-0BB25 for the auxiliary trip assembly). No voltage trigger, phase failure detection, or communication function is built in — this is a straightforward thermal-magnetic protector with undervoltage trip, not a smart breaker.
Thermal Derating and Ambient Temperature
The 80 A rating holds flat from 40 °C through 50 °C ambient. Above that it derates: 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 the panel runs hot — say, a sealed enclosure near a furnace line — account for the drop; the breaker won't nuisance-trip at 72 A in a 70 °C cabinet, but it also won't carry a full 80 A load. Operating temperature range is -25 °C to +70 °C; storage from -40 °C to +80 °C. The IP40 front protection means the breaker face is splash-protected against solid objects over 1 mm, but the enclosure itself needs to keep water and dust out — this is a panel-mount device, not a standalone outdoor unit.
Mounting and Dimensions
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 76.2 mm width (3 inches) is standard for a 3-pole MCCB in this class — it fits existing SENTRON busbar systems and DIN-rail adapters without panel rework. Mechanical endurance is rated at 15,000 operations, adequate for a distribution feeder that sees infrequent switching.