The ABB F204 AC‑63/0.03 is a 4‑pole residual current circuit breaker (RCCB) designed to protect people and installations from earth leakage (ground fault) currents in three‑phase AC electrical systems. It continuously monitors the balance of current in all conductors and trips the circuit when leakage current exceeds the specified threshold (30 mA), which helps prevent electric shock and fire hazards. This device does not provide overcurrent protection and should be used in combination with upstream protective devices such as MCBs or fuses. It mounts on a standard DIN rail in distribution boards or control panels and is suitable for residential, commercial, and light industrial installations under appropriate standards.
