80 A MCCB with UVR — what the ratings mean for fit
The Siemens 3VA1080-4ED36-0BH0 is a 3-pole SENTRON molded case circuit breaker rated for a continuous current Iu of 80 A. The TM210 thermal-magnetic release handles overloads and short-circuits without external power, and the integrated undervoltage release (UVR) drops the breaker if control voltage is lost — a standard requirement for emergency-stop circuits and safety disconnects. Breaking capacity runs from 121 kA at 240 V down to 11.9 kA at 690 V, so at typical 400/415 V distribution levels it clears 75.6 kA without cascading upstream breakers.
Thermal derating and panel space
The breaker carries its full 80 A from 40 °C to 50 °C ambient. Above that it derates linearly to 72 A at 70 °C — a curve worth checking if the MCCB sits next to transformers or drives inside a compact enclosure. Physical footprint is 130 mm high, 76.2 mm wide, 70 mm deep; the 3-pole width (about 3 inches) fits standard panel layouts. IP40 on the front means it's protected against tools and wires >1 mm, but not against water ingress — keep it inside the cabinet.
Auxiliary contacts and release configuration
Factory-fitted auxiliary contact block carries 2 auxiliary switches plus 1 trip alarm switch (HQ type). The undervoltage release is wired separately from the TM210 trip mechanism; on a loss of control voltage the UVR trips the breaker mechanically. No ground-fault monitoring or communication module on this variant — it's a pure line-protection device with a wired safety drop. The integrated auxiliary trip order code is 3VA9608-0BB11 if you need a replacement module.