The Siemens 5SY4620-7CV is a 4-pole (3+N) miniature circuit breaker with C-curve tripping characteristic, rated 20 A at 35 °C and carrying a 15 kA breaking capacity per IEC/EN 60947-2. Rated operating voltage is 440 V AC multi-phase, with a maximum DC operating voltage of 72 V. The breaker is designed for mechanical engineering and industrial environments, accepting supply from any position and mountable in any orientation via the quick-assembly system.
The 20 A rating holds at 35 °C ambient. At 40 °C the breaker derates to 18.54 A, at 50 °C to 16.9 A, and at 55 °C to 16.08 A. This matters for panels with high internal heat rise — if the breaker sits next to transformers or drives, use the 50 °C column to size the branch. The surrounding humidity limit is 95% at 55 °C, tapering to 35% at 75 °C. Temperature range spans -40 °C to 75 °C, with vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.
Integration notes
The neutral pole is switched (3+N design).
Rated frequency is 50/60 Hz. The part carries the designation letter 'F' per both EN 61346-2 and IEC 81346-2 for circuit-breaker function identification in schematics. That is standard for DIN-rail MCBs; no washdown rating here.