Selective RCBO for feeder protection
Selective design means it coordinates with downstream devices — under fault conditions it delays tripping long enough for the branch breaker to clear first, keeping supply to healthy circuits. Type A residual detection catches pulsating DC fault currents from electronics and single-phase rectified loads — the most common leakage waveform in modern panels.
Rated 125 A at 30 °C, the 5SU1624-7WK82 derates to 115.62 A at 40 °C, 111.25 A at 45 °C, 106.25 A at 50 °C, 101.25 A at 55 °C, and 96.25 A at 60 °C. In a sealed distribution board or high-ambient enclosure, the 40 °C figure is the practical design limit — plan your load accordingly. The unit occupies 7 modular width units (198 mm wide) with a depth of 77 mm and installation depth of 70 mm.