MCB for branch circuit protection — 20 A C-curve, 1+N pole
It carries a 6 kA breaking capacity per EN 60898 at 230 V AC, 1+N-pole configuration (switching both line and neutral), and occupies a single modular width (18 mm) on standard DIN rail.
Rated 20 A at 30 °C ambient, derating to 18.8 A at 40 °C and 18.2 A at 45 °C. In a 40 °C panel — common for enclosed distribution boards — the effective continuous current is 18.8 A, not 20 A. Factor that into your cable and load sizing. For industrial panels with higher prospective short-circuit current (above 6 kA), you would step to the 5SY6 series variants rated 10 kA or use a current-limiting upstream device.
Depth 76 mm, width 18 mm (1 MW), height 90 mm. Installation depth 70 mm. Combined terminal top and bottom are both listed as 'No' — this is a standard screw-clamp terminal, not a feed-through or comb-bus variant. Neutral conductor switching is integrated (1+N pole), so the neutral is switched simultaneously with the phase, meeting disconnection requirements for single-phase final circuits.