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 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. 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.
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.