Siemens 5SU1354-0KK13 — SENTRON RCBO, 13 A, Type B, Type AC Residual Current
The Siemens 5SU1354-0KK13 is a SENTRON RCBO (residual current circuit breaker with overcurrent protection) rated at 13 A with a Type B tripping characteristic and Type AC residual current detection. It occupies 2 modular width units (36 mm) on a DIN rail, with a depth of 77 mm and height of 90 mm, making it a direct drop-in for standard SENTRON distribution boards. Breaking capacity is 10 kA per EN 60898 and 20 kA per IEC 60947-2, giving it headroom above the standard domestic 6 kA requirement — useful for industrial sub-distribution where fault levels are higher. The Type B characteristic means the magnetic trip operates at 3–5× In, so it's sized for resistive and general-purpose loads, not motor circuits. The Type AC residual current detection handles sinusoidal AC fault currents; for pulsed DC or smooth DC faults you'd need a Type A or F device. Rated current derates with ambient temperature: 13 A at 30 °C, 12.48 A at 40 °C, 11.96 A at 50 °C, 10.53 A at 65 °C, and 10.01 A at 70 °C. If the panel runs hot (common in crowded enclosures), the effective rating drops — factor that into your load calculation. Operating temperature range is -40 °C to 75 °C, so it's fine for unheated outdoor cabinets in cold climates. Supply can enter from top or bottom, and mounting position is any orientation — no derating for sideways or inverted mounting. Touch protection is built in, and the unit is halogen-free and silicon-free, which matters in clean-room or corrosive environments where outgassing can't be tolerated.
Panel Integration
Mounts on a DIN rail in any position. The 36 mm width (2 MW) matches the standard SENTRON grid; depth of 77 mm and installation depth of 70 mm mean it sits flush in a 4-row enclosure without hitting the gland plate. IP20 rating applies only with the distribution board installed and conductors connected — it's not a standalone IP20 device for open-panel use.