Siemens SENTRON 3VA1080-3ED32-0KH0 — 80 A MCCB for Line Protection
The Siemens 3VA1080-3ED32-0KH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 80 A at 40 °C, with a 3-pole configuration and a rated insulation voltage of 800 V. Breaking capacity reaches 75.6 kA at 240 V AC, stepping down to 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V — enough headroom for most industrial fault-current scenarios on a 240 V or 400 V line. The breaker includes a shunt trip (STL) for remote opening and is factory-equipped with two auxiliary switches plus one trip alarm switch (HQ configuration). No undervoltage release or ground-fault monitoring is fitted from the factory.
Thermal Derating and Panel Fit
Current rating holds at 80 A from 40 °C through 50 °C, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. This means the breaker can be installed in a warm enclosure without losing much capacity — a 6 A drop from 40 °C to 70 °C is tight for an 80 A frame. Dimensions are 130 mm height, 76.2 mm width, and 70 mm depth — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling. Maximum power loss is 19.2 W, so ventilation in a sealed cabinet is advisable if several breakers are ganged. Operating temperature range spans -25 °C to 70 °C; storage range is -40 °C to 80 °C. The trip indicator and voltage trigger are present, confirming visual and electrical status feedback for panel troubleshooting.