The Schneider Electric A9DC7710 is an Acti9 iCV40 RCBO — a combined residual-current circuit breaker with overcurrent protection, rated 10 A with a C-curve magnetic trip characteristic (5...10 x In) and integrated 300 mA earth-leakage sensitivity. It protects a 3P+N outgoing circuit against overload, short-circuit, and earth faults in one 4-module-wide (72 mm) DIN-rail unit, saving panel space over separate MCB+RCCB.
The 10 A rated current (In) and C-curve mean the breaker holds 10 A indefinitely and trips magnetically between 50 A and 100 A — suited for general-purpose loads like lighting banks, small motor circuits, and socket outlets where inrush is moderate. The 300 mA earth-leakage threshold is a protection against fire risk from persistent leakage, not personnel shock (that needs 30 mA or lower); it's common on distribution outgoers feeding sub-distribution boards or fixed equipment where nuisance tripping from capacitive leakage must be avoided. Limitation class 3 (energy let-through) means it restricts the peak let-through energy under fault — helps with downstream coordination and reduces stress on cables and connected equipment.
Clip-on mounting on a DIN rail — 9 mm pitch, 10 pitches wide (90 mm). Neutral is on the left (3P+N). Connection pitch is 18 mm between phases, 9 mm between phase and neutral. Tunnel terminals accept 1...16 mm² rigid or 1...10 mm² flexible cable; strip 14 mm and torque to 2 N.m. The toggle control gives clear ON/OFF and fault indication on the front face.