The Siemens SENTRON 5SM2325-6KK01 is a residual current (RC) unit designed to pair with a 5SY miniature circuit breaker, forming a combined RCD/MCB protection device. It is a 2-pole unit, type A, rated at 63 A and 30 mA tripping fault current, for 230 V AC systems. The type A designation means it detects sinusoidal AC residual currents plus pulsating DC residual currents — the standard for circuits with single-phase rectifiers, switched-mode power supplies, or electronic loads that produce pulsed DC fault currents.
The 63 A rating is at 40 °C (58.6 A at 40 °C, 58.59 A at 45 °C). Above that, the unit derates: 56.7 A at 50 °C, 54.81 A at 55 °C, 53.55 A at 60 °C, 52.29 A at 65 °C, and 50.4 A at 70 °C. The surge current resistance is rated at 3 kA, which covers most inrush events from motor starts or capacitor banks without nuisance tripping.
Mounting position is any orientation. Installation depth is 70 mm, matching the 70 mm depth of the 5SY MCB it attaches to. The 71 mm width and 90 mm height are the same as the 5SY breaker, so the assembly sits flush in a panel.