The Siemens SENTRON 5SM2332-6 is a 3-pole residual current device (RCD) rated 40 A at AC with a 30 mA trip threshold, Type A waveform sensitivity. It operates on a 50 Hz supply and is designed for instantaneous tripping — no adjustable delay. The unit occupies 3 modular width units on a DIN rail and mounts in any position. Ambient operating range is -25 °C to 45 °C; storage from -40 °C to 75 °C. Enclosure protection is IP20 once installed with conductors connected.
What the ratings mean for fit
The 40 A AC rating is the continuous current-carrying capacity at 40 °C ambient; derate to 37.2 A at 45 °C, 36 A at 50 °C, and 32 A at 70 °C. The 30 mA trip is standard for personnel protection (shock hazard) per IEC 60364. Type A detection catches sinusoidal AC and pulsating DC residual currents — common in single-phase rectified loads like switching power supplies and LED drivers. The 3-pole construction handles three-phase circuits; the neutral is not switched through the device (requires a separate neutral bar).
Panel integration
Snap-on mounting to 35 mm DIN rail per EN 60715. The 70 mm depth fits standard distribution boards; the 107 mm width (3 MW) matches adjacent MCBs and RCDs in the SENTRON range. Degree of pollution 2 and overvoltage category III suit fixed-installation panels. The unit is not sealable and has no adjustable trip or off-delay.