Siemens 3VA1580-5EF32-0AD0 — 800 A SENTRON MCCB, Line Protection, Active Production
Breaking capacity is 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 52.5 kA at 690 V — figures that give selectivity headroom for a main or feeder breaker in a high-fault panel, particularly on the low-voltage side of a 480 V distribution transformer where the available fault current can exceed 100 kA.
Thermal Derating — Continuous Current vs. Ambient
Above 50 °C the breaker must be derated: 780 A at 55 °C, 761 A at 60 °C, 741 A at 65 °C, and 722 A at 70 °C. For a panel with a 55 °C internal ambient — common in a packed switchboard — the breaker is effectively a 780 A device. Account for this during coordination studies; the TM240 overcurrent release is set for the 800 A frame, but the thermal trip curve shifts with ambient.
Configuration and Accessories — What This Order Code Includes
The trip indicator is not fitted, and there is no voltage-trigger function. The design is line protection, meaning the TM240 thermal-magnetic release is matched to cable and busbar protection rather than motor or generator duty.
The breaker is rated for indoor installation in a controlled environment — no IP rating is listed, so it expects enclosure protection. Dimensions are 320 mm height, 210 mm width, 120 mm depth.