The Siemens SENTRON 5SQ2670-2YA16 is a 4-pole miniature circuit breaker (MCB) with a C-curve trip characteristic rated at 16 A, designed for 400 V AC 50 Hz systems.
The C-curve means the magnetic trip operates at 5 to 10 times rated current — 80 to 160 A — so it handles moderate inrush from motor starters or transformers without nuisance tripping, while still clearing a hard short. The 3 kA breaking capacity per EN 60898 certifies it for use where the prospective short-circuit current at the installation point does not exceed 3 kA; above that, an upstream MCCB or fuse must coordinate. Overvoltage category 3 and energy limiting class 3 indicate it limits let-through energy during a fault, reducing stress on downstream wiring and equipment.
Occupies 4 width units on a standard DIN rail.