The Schneider Electric A9DC2950 is an Acti9 iC60 RCBO — a residual current breaker with overcurrent protection, combining a 3P+N thermal-magnetic MCB and an integrated earth-leakage module in one 54 mm-wide DIN-rail unit. It is rated 50 A at 30 °C with a C-curve trip characteristic, so it handles moderate inrush from motor or lighting loads without nuisance tripping, and its 100 mA earth-leakage sensitivity covers personnel and equipment protection in TN earthing systems. The 10 kA Icn breaking capacity at 400/415 V AC meets the standard for most commercial and light-industrial distribution boards — it safely interrupts a bolted fault up to that level without cascading upstream, which is the figure that governs coordination with the upstream protective device.
Clip-on mounting onto a DIN rail or chassis rail, 6 modules wide (9 mm pitch each), so it occupies 54 mm of rail space. Screw-clamp terminals accept 1…25 mm² rigid or 1…16 mm² flexible on both top and bottom. Strip length is 14 mm for the top connection, 11 mm for the bottom. Tightening torque is 2.5 N.m for both power-circuit connections.
Mechanical durability is rated at 20,000 cycles, electrical durability at 5,000 cycles under rated load. The limitation class is 3, meaning it limits let-through energy in a fault — a detail that matters for downstream component coordination.