RCD-operated circuit breaker — 4-pole, 63 A, C curve
The Siemens SENTRON 5SU9346-1CR63 is an RCD-operated circuit breaker — a combined residual-current device and overcurrent protection in one 4-pole unit. It carries a 63 A rating at 30 °C (derated to 58.6 A at 40 °C, 56.1 A at 45 °C, 54.8 A at 50 °C, and 53.6 A at 55 °C) with a C tripping characteristic, meaning it handles moderate inrush from motor or transformer loads without nuisance trips. Rated AC operating voltage of 400 V, insulation voltage (Ui) 440 V, overvoltage category III, pollution degree 2 — standard for fixed-installation switchgear. The instantaneous design (no intentional time delay on the RCD function) provides fast disconnection for earth faults. Supply can enter from either top or bottom; mounting position is unrestricted.
Occupies 7 modular width units (MW) on a DIN rail. Overall dimensions: 126 mm wide, 90 mm high, 77 mm deep (installation depth 70 mm). Halogen-free and silicon-free construction suits clean-room or low-smoke installations.