Arc-fault detection device (AFDD) and MCB in one 18 mm slot
The Siemens SENTRON 5SV6016-7KK40 is an AFDD-MCB combination unit — an arc-fault detection device and a 40 A C-curve miniature circuit breaker in a single 18 mm-wide housing. It protects a 230 V AC final circuit against overcurrent, short-circuit, and series/parallel arc faults, all in one DIN-rail module. The 6 kA breaking capacity (per EN 60898-1 and IEC 60947-2) is sized for residential and light commercial distribution boards where the prospective fault current stays under that threshold.
What the ratings mean for panel fit
The arc-fault detection covers series arcs (2 A to 40 A, per /) and parallel arcs (50 A to 500 A, per /). The series-arc range matters because a loose terminal or a nicked conductor can draw below the MCB's thermal trip threshold; the AFDD catches that. The parallel-arc range covers line-to-neutral faults that may not draw enough current to hit the magnetic trip instantly. Both ranges are within the 6 kA breaking capacity, so the device clears the arc without upstream interruption if the fault current stays under that limit. Operating temperature spans -40 °C to 75 °C (/), with a 55 °C limit at 95% relative humidity. That covers unheated utility rooms and outdoor enclosures in most climates. The IP20 rating is standard for a DIN-rail device inside a distribution board — the terminals are finger-safe only when the board cover is on and conductors are connected.
Mounting and integration
Snap-on DIN rail mount, 18 mm width — one modular unit. Depth is 68.5 mm, requiring 70 mm installation depth for the rail and conductor bending radius. Mounting position is any; the device can be rotated 90° on the rail if the panel layout demands it. The halogen-free and silicon-free construction (/) is relevant for high-reliability installations where outgassing during a fault must not corrode adjacent contacts.