The Siemens SENTRON 5SY6420-7CC is a 4-pole miniature circuit breaker (MCB) with a C tripping characteristic, rated 20 A at 400 V AC, 50/60 Hz. It breaks fault currents up to 6 kA per EN 60898 and 5 kA per UL 1077 / CSA C22.2 No.235 — enough for most commercial and light industrial distribution panels.
Where it fits and how it mounts
Installation depth is 70 mm.
Halogen-free and silicon-free construction, sealable for tamper evidence. Rated for ambient temperatures from -40 °C to 75 °C, with derating above 55 °C per the humidity curve (max 95% RH at 55 °C, dropping to 35% at 75 °C). Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.