Siemens 5SU1324-6FP16 — SENTRON RCBO, 2-pole B-16A
The Siemens 5SU1324-6FP16 is a 2-pole residual current circuit breaker with overcurrent protection (RCBO) from the SENTRON family, rated 16 A at 30 °C with a B-curve tripping characteristic. It occupies 2 modular width units (36 mm) on a DIN rail, with a depth of 72 mm and height of 85 mm. Rated 230/240 V AC at 50 Hz, the unit provides both overcurrent and residual current protection in a single module — a space-saving choice for final subcircuits in residential and light commercial distribution boards. The B-curve means it trips at 3–5× In (48–80 A magnetic), suited for resistive and general-purpose loads with limited inrush. Breaking capacity is 10 kA per EN 60898 and 15 kA per IEC 60947-2, giving adequate fault-clearing headroom for most domestic and small commercial installations.
Current rating is temperature-dependent: 16 A at 30 °C, derated to 15.2 A at 40 °C, 14.3 A at 50 °C, and 12.5 A at 70 °C. In a crowded enclosure with ambient above 40 °C, factor the derated value into the circuit design — the 70 °C rating (12.5 A) is the floor for worst-case internal panel temperature. Mounting position is any, supply feed from top or bottom. The 72 mm installation depth fits standard shallow enclosures; 2 MW width (36 mm) leaves room for adjacent breakers in a multi-way board.