The 5SM3412-0LB: The 25 A rated current and 100 mA residual current set the protection threshold: this RCCB will trip when leakage to earth exceeds 100 mA, which is typical for general-purpose submain or feeder protection where a higher threshold avoids nuisance tripping from cable capacitance or equipment inrush. The AC-type detection (type AC) responds to sinusoidal AC residual currents only; if your load includes pulsed DC or smooth DC leakage (e.g., from VFDs, UPS, or EV chargers), you need a type A or B RCCB instead.
Mounts on DIN rail (REG) in any position. Installation depth is 70 mm, fitting standard 18 mm modular enclosures. The silicon-free construction is useful for environments where silicone outgassing can contaminate contacts or optics.
Ambient limits and service life
The 45 °C maximum limits installation in unconditioned hot attics or directly adjacent to high-heat sources without derating.
This is a current-production part (lifecycle stage: current). No official successor has been announced — the 5SM3 design remains the active SENTRON RCCB series for this rating.