Siemens 5SY7206-6 SENTRON Miniature Circuit Breaker – 2-Pole, B-Curve
The Siemens 5SY7206-6 is a 2-pole miniature circuit breaker from the SENTRON family, with a B tripping characteristic and a rated breaking capacity of 15 kA per IEC/EN 60898-1 and 40 kA per IEC 60947-2. It is rated for 440 V AC (single- or multi-phase) and 72 V DC maximum, at 50/60 Hz. The B-curve trips between 3 and 5 times rated current, making it a standard choice for general-purpose branch-circuit protection in commercial and industrial panels — not for motor-starting inrush, but fine for lighting, receptacle, and control-transformer circuits.
Breaking Capacity & Standards Compliance
This breaker carries a 15 kA rating per IEC/EN 60898-1 (the domestic and light-commercial MCB standard) and a 40 kA rating per IEC 60947-2 (the industrial circuit-breaker standard). The 40 kA figure means it can safely interrupt high fault currents in industrial panels without upstream fuses — useful when the available fault current at the panel is above 15 kA. For UL 1077 and CSA C22.2 No. 235 applications, the rating is 5 kA. The part also meets pollution degree 3 and overvoltage category III, so it is suitable for fixed installations in enclosures where conductive contamination is possible. The 5SY7206-6 is halogen-free and silicon-free, which matters for panels in clean-room, semiconductor, or food-processing environments where outgassing or silicone contamination must be avoided.
Panel Integration & Mounting
The breaker snaps onto a DIN rail (35 mm) using the quick-assembly system and occupies 2 modular width units (36 mm). Mounting position is any, so it can be installed horizontally or vertically without derating. The IP20 rating applies with connected conductors — standard for enclosed panel use. Combined terminals at top and bottom accept the same wire range, simplifying wiring. Depth is 76 mm (installation depth 70 mm), leaving clearance behind the DIN rail.
Environmental Range & Derating
The 5SY7206-6 operates from -40 °C to 75 °C, with humidity derating: max 95% RH at 55 °C, tapering to 35% RH at 75 °C. That covers most indoor industrial panels and even unheated outdoor enclosures in temperate climates. The sealable feature allows the installer to lock the toggle position with a padlock for lockout/tagout compliance.