What this 4-pole B-curve MCB delivers for your panel
The Siemens 5SY4406-6 is a 4-pole miniature circuit breaker from the SENTRON series, rated for 400 V AC and carrying a B tripping characteristic — meaning it trips between 3 and 5 times rated current, the standard choice for resistive and general-purpose loads where nuisance tripping from inrush is not expected. Breaking capacity is 10 kA per EN 60898-1 and 35 kA per IEC 60947-2, with a DC rating of 15 kA at 60 V (max 72 V) per IEC 60947-2, and 5 kA under UL 1077 / CSA C22.2 No.235 — so it covers both residential-style and industrial fault-current levels in the same footprint.
Standards and compliance — what the approvals mean for your install
The 5SY4406-6 is certified to IEC / EN 60898-1 (the residential and commercial MCB standard) and IEC / EN 60947-2 (the industrial breaker standard), plus UL 1077 and CSA C22.2 No.235 — so it is accepted in European, UK, and North American installations where supplementary protection is required. Halogen-free and silicon-free construction reduces the risk of corrosive gas emission under fault — relevant for sealed enclosures or environments sensitive to silicone outgassing.