What this MCCB is and what it does
The Siemens SENTRON 3VA1080-4ED36-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current Iu of 80 A, built for line protection in distribution panels and motor control centers. It carries a TM210 thermal-magnetic overcurrent release — the '210' designates a fixed thermal trip at 80 A with a magnetic short-circuit pickup of 10× In, so it handles moderate inrush without nuisance tripping while clearing hard faults fast. Breaking capacity is the headline here: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. That 75.6 kA at 415 V is the figure most panel builders will size against — it tells you this breaker can interrupt a bolted fault on a 400 V class system without upstream fuses needing to clear first, as long as the available fault current stays under that mark. Rated insulation voltage Ui is 800 V, which covers 690 V line-to-line systems with margin. The front face carries IP40 protection — fine for a closed panel, but not for washdown zones.
Thermal derating and real-world current
The 80 A rating holds flat from 40 °C through 50 °C. At 55 °C it derates to 76.8 A, at 60 °C to 75.2 A, at 65 °C to 73.6 A, and at 70 °C to 72 A. If your panel ambient runs above 50 °C, the continuous load must be backed off accordingly — the breaker won't trip early, but the thermal element tracks the enclosure temperature. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage limit governs handling and warehousing, not running duty.
Auxiliaries and releases
This variant ships with a shunt trip (STL) undervoltage release designed as 3VA9688-0BL33, plus two HQ auxiliary switches. The shunt trip lets a remote signal (PLC, E-stop relay, fire alarm) force the breaker open — essential for emergency-off circuits that need to drop the load without an operator at the handle. The HQ aux switches provide position feedback for status monitoring or interlocking. No undervoltage release, no phase-failure detection, no ground-fault monitoring, no communication module — this is a straightforward thermal-magnetic breaker with a shunt trip, not a smart or communicating device.
Mechanical endurance and footprint
Rated for 15,000 mechanical operations — typical for a panel main or feeder breaker that sees a few cycles per day. Dimensions are 130 mm height, 76.2 mm width, 70 mm depth. The 76.2 mm width (3-inch pitch) fits standard Siemens SENTRON mounting bases and busbar systems; the 70 mm depth leaves room for rear-connected busbars in a 200 mm deep enclosure.