RCCB for 400 V three-phase panels — 63 A, 100 mA trip, type AC
In a panel fed by a transformer with a 10 kA prospective fault level or less, this unit holds its own without needing a backup fuse or upstream MCB to limit the let-through.
DIN-rail fit and conductor termination
The 70 mm installation depth is standard for the SENTRON 5SM3 family, so it aligns with the backplane in a typical distribution board. Terminals accept solid or stranded conductors from 1.5 mm² up to 25 mm² — covers everything from a 2.5 mm² lighting circuit tail up to a 16 mm² or 25 mm² main feeder. Tightening torque is 2.5 to 3 N·m, typical for the screw-type terminals on this class of RCCB. The IP20 rating applies once the distribution board is installed with conductors connected; the device itself is finger and back-of-hand safe per the protection against electrical shock listing.
The 10 000 mechanical switching cycles typical is standard for a panel-mounted RCCB — adequate for a distribution board that sees infrequent manual test operations plus occasional fault trips. Silicon-free construction is noted, which matters for potting or conformal-coating processes in certain industrial electronics enclosures.