It is rated 25 A at 230/400 V AC, 50 Hz, with a 30 mA trip sensitivity and instantaneous response — meaning it clears a ground fault as soon as leakage exceeds that threshold, no intentional delay.
At 65 °C it drops to 23.3 A, and at 70 °C to 17.62 A. Overvoltage category III qualifies it for fixed-installation distribution boards, not just downstream equipment. The I²t value of 58 000 A²·s is the let-through energy the device can withstand — useful for coordination with an upstream MCB or fuse. The AC fault-current type means it detects sinusoidal AC leakage only; if your load has pulsed DC or smoothed DC leakage (VFDs, battery chargers, LED drivers), you need an A or B type instead.
The N-left variation means the neutral pole is on the left side when viewed from the front, which matters for busbar alignment in a multi-device row.