SENTRON 5SY6406-6 — 4-pole MCB, B-curve, 6 A
The Siemens 5SY6406-6 is a 4-pole miniature circuit breaker from the SENTRON 5SY6 series, rated 6 A at 400 V AC with a B tripping characteristic.
The B-curve trips at 3–5× rated current (18–30 A for this 6 A unit), so it's the right choice for resistive or general-purpose loads where inrush is modest — lighting, heaters, control transformers. Don't use it on motor circuits or high-inrush loads; that calls for a C or D curve. The 6 kA EN 60898 rating covers the standard domestic/commercial fault level; the 30 kA IEC 60947-2 rating confirms it can be applied in industrial panels with higher prospective fault current, as long as the installation complies with the industrial standard. Four poles (4P) means it switches and protects all three phases plus neutral. The neutral pole is switched but not inherently protected — confirm the neutral arrangement in your distribution board before specifying.
Mount in any position; ambient range -25 to +55 °C.