Siemens SENTRON 5SM2643-0 RCD-unit, 4-pole, type AC, rated current 40 A, rated fault current 300 mA, instantaneous, 400 V AC.
| Parameter | Value |
|---|---|
| Number of poles | 4 |
| Overvoltage category | III |
| Parameter | Value |
|---|---|
| Product designation | RCD-unit |
| Product design / construction | instantaneou |
| Parameter | Value |
|---|---|
| Mounting position | any |
| Width in modular units | 3 |
| Maximum | 45 °C |
| Minimum | -5 °C |
| Width | 123 mm |
| Height | 90 mm |
| Depth | 70 mm |
| Installation depth | 70 mm |
It's a type AC, instantaneous-trip device rated at 40 A with a 300 mA fault current threshold, intended for 400 V AC systems.
The 40 A rating holds at 40 °C ambient (37.2 A), and derates progressively to 32 A at 70 °C. The operating range is -5 °C to 45 °C, with storage extremes of -40 °C to 75 °C.
The 70 mm installation depth matches standard distribution board cutouts. Not sealable, so it's intended for indoor, enclosed panels — not washdown or outdoor exposure.
It's a residual current device (RCD) for 400 V AC, 4-pole circuits, rated 40 A with a 300 mA trip threshold. Type AC means it detects sinusoidal AC fault currents only. It's designed as an RC unit paired with 5SL4 series MCBs for combined overcurrent and earth-fault protection in distribution boards.
Rated current 40 A AC, rated fault current 300 mA, insulation voltage 460 V, surge voltage resistance 4000 V. Thermal derating applies above 40 °C: 37.2 A at 45 °C, down to 32 A at 70 °C. Mechanical service life is 10,000 switching cycles typical.
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