What this MCCB carries — and what it doesn't
The Siemens SENTRON 3VA1080-3ED36-0KA0 is a 3-pole molded case circuit breaker rated for 80 A continuous current at 40 °C, with a TM210 thermal-magnetic release and a shunt trip (STL) auxiliary release. It's a line-protection device — no ground-fault monitoring, no undervoltage release, no communication module, and no auxiliary contacts on the base unit. The interrupting ratings climb as voltage drops: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. That spread tells you this breaker is sized for high-fault-capacity panels on 240 V or 415 V distribution, not for 690 V motor circuits where the SCCR drops sharply.
Thermal derating — where the 80 A holds and where it tapers
The 80 A rating is 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 sits at 50 °C or below, you get the full 80 A without a sizing penalty. Above that, the TM210 release's thermal element responds to the higher ambient — factor the derating into your load calculation rather than oversizing the breaker.
Physical fit and panel integration
The 3VA1080-3ED36-0KA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. Three-pole footprint, IP40 on the front — suitable for enclosed distribution boards where the front face is behind a door. No trip indicator on the fascia, so fault indication relies on the shunt trip or a downstream annunciator. The integrated auxiliary trip order code is 3VA9688-0BL33 if you need to add remote signaling.