The Siemens SENTRON 5SM2347-6 is a 4-pole residual current device (RCD) rated 100 A at AC with a 30 mA Type A trip characteristic. It's an instantaneous unit, designed for use with the 5SP4 distribution board series. Out here in the grease, that 30 mA Type A rating means it catches both sinusoidal AC faults and pulsating DC faults from electronics — the kind you get from a VFD or a switching supply on a pump skid. It'll hold up from -40 °C to 75 °C, so it's fine in an unheated panel room or a hot motor control center.
Ratings and fit
The 100 A rating at AC is the headline number, but what matters for a real install is the temperature derating: at 70 °C ambient it's good for 80 A, so if you're packing this into a hot panel with other breakers, you need to watch the load. The insulation voltage (Ui) is 460 V, and it's rated for overvoltage category III with pollution degree 2 — standard for fixed-install distribution boards. The 30 mA trip is the standard for personal protection against direct contact; it'll clear a ground fault before it cooks a motor winding or, worse, a technician's hand. It's a 5-module-width unit (124 mm wide) with a depth of 70 mm. Mounts in any position, top or bottom feed. The IP20 rating applies only when installed in the distribution board with conductors connected — so it's not a standalone outdoor device. Sealable? No, but that's typical for this class of RCD.