The Schneider Electric A9D15816 is an Acti9 iC60 RCBO — a combined residual current breaker with overcurrent protection (RCBO) in a 1P+N configuration, rated 16 A at 50 °C with a C-curve trip characteristic and 100 mA earth-leakage sensitivity. It clips onto a DIN rail, occupies 18 mm width (2 x 9 mm pitches), and delivers a breaking capacity of 10000 A Icn at 240 V AC. The thermal-magnetic trip unit handles both overload and short-circuit protection, while the integrated earth-leakage module covers ground faults. This is a current-production part, so it remains a standard BOM line for new panels and replacement spares.
The 16 A rated current at 50 °C sets the continuous load limit for the protected circuit — above that, the thermal element begins its trip curve. The 100 mA earth-leakage sensitivity is a deliberate choice: it's less sensitive than 30 mA, so it avoids nuisance tripping on circuits with natural leakage (long cable runs, multiple loads), but still provides ground-fault protection. Compliance with IEC 61009-1 and IEC 61009-2-2 confirms it meets the international standard for RCBOs covering both overcurrent and residual current protection.
Clip-on mounting onto a standard DIN rail — no screws needed, just snap it in and out with a screwdriver on the release tab. The 18 mm width means it takes two 9 mm pitch spaces, so plan your rail fill accordingly. Neutral is on the left, which matters when laying out busbars or pre-wired distribution blocks. The IP20 protection means it's for dry indoor enclosures only — no washdown environments.