Siemens SENTRON 3VA1080-3ED32-0BC0 — 80 A Molded Case Circuit Breaker, Line Protection
The Siemens SENTRON 3VA1080-3ED32-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated for 80 A continuous current (Iu) and designed for line protection in distribution panels and motor control centers. Its TM210 thermal-magnetic overcurrent release provides fixed thermal and magnetic trip settings, making it a straightforward choice for feeder protection where adjustable trip curves aren't required. Breaking capacity is 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V — the 415 V figure is the one most commonly checked for European 400 V distribution. Rated insulation voltage (Ui) is 800 V, so the breaker can be specified into 690 V systems without a voltage derating concern on the insulation side.
Thermal Derating and Ambient Temperature
The 80 A rating holds at ambient temperatures up to 50 °C — no derating needed in a typical 40 °C panel. Above that, current must be reduced: 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage minimum matters if the breaker sits in an unheated warehouse before installation.
Auxiliary and Undervoltage Release Configuration
This variant ships with an undervoltage release (UVR) — the integrated auxiliary release type is designated 3VA9608-0BB11 — and two HQ auxiliary switches for status feedback to a PLC or indication circuit. The UVR ensures the breaker trips if control voltage drops below a threshold, a common requirement for safety circuits and emergency-stop chains. No voltage trigger or phase-failure detection is built in.
Physical Fit and Panel Integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth. The 76.2 mm width is a standard 3-pole MCCB footprint for DIN-rail or screw-mount panels — verify gland-plate cutouts against the existing backpanel layout. Front protection is IP40, meaning tools and fingers are kept out but the breaker is not sealed against water ingress — suitable for indoor panel installation only.