Siemens 3VA1080-3ED36-0HC0 — 80 A Line Protection MCCB, Current Lifecycle
The Siemens 3VA1080-3ED36-0HC0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries 80 A continuous current (Iu) at 40 °C through three poles, with a TM210 thermal-magnetic overcurrent release and an integrated shunt trip (STL) for remote tripping. The interrupting ratings are 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V — figures that govern its fault-clearing capability at the point of common coupling. The 80 A rating holds flat from 40 °C through 50 °C, then derates to 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C. In a 50 °C panel — common for enclosed switchgear — the breaker still delivers its full 80 A without derating. Above that, the thermal curve governs; a panel builder should check the ambient at the breaker location, not the room setpoint.
Interrupting Capacity — What the Ratings Mean for Panel Coordination
The 75.6 kA at 240 V is the highest short-circuit current this MCCB can safely interrupt at that voltage level. At 415 V — common for three-phase industrial mains in much of the world — the rating drops to 52.5 kA. At 690 V it is 7.5 kA. These figures determine whether the breaker coordinates with upstream fuses or a transformer's through-fault current. If the available fault current at the panel exceeds the breaker's rating at the system voltage, the breaker may not clear the fault without damage; coordination study results govern the selection, not the headline number alone.
Physical Fit and Auxiliary Options
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a 3-pole footprint that fits standard SENTRON mounting bases in distribution boards. It carries two auxiliary switches (HQ) for status feedback to a PLC or indication lamp. The shunt trip (STL) is wired separately; its coil must be energized to trip the breaker remotely. There is no undervoltage release, no ground-fault monitoring, and no communication module on this variant — it is a straightforward thermal-magnetic line protection device. The front face carries IP40 protection — suitable for indoor panel installation where no water jets or dust ingress are expected. The integrated auxiliary trip is order code 3VA9688-0BL30, ordered separately if a factory-fitted shunt trip is not already specified.
Temperature Range and Storage
Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage limits exceed the operating range — that governs handling during transport and warehouse idle, not running conditions. Latching endurance is rated at 15,000 operations.