Siemens SENTRON 5SU1674-7AK81 — RCBO, 4-Pole, 100 A, Type B
The C tripping characteristic handles moderate inrush from motor or lighting loads. Supply connection can be made from either top or bottom, simplifying panel layout.
The 100 A rating is valid at 30 °C ambient. At 40 °C the continuous current derates to 92.5 A; at 50 °C to 85 A; at 60 °C to 77 A. For a panel that runs warm — say 45 °C inside the enclosure — the usable rating is 89 A. This derating curve must be factored into the load schedule for compliance with IEC 60898.
The device occupies 11 modular width units (198 mm wide), with a depth of 77 mm and a height of 90 mm. Installation depth is 70 mm. The 77 mm depth is the overall body dimension including the front face; the 70 mm installation depth is the space required behind the panel face for the body and terminals. Verify that the distribution board has sufficient gutter space for the 4-pole width and the cable bending radius for 100 A conductors.