The ABB GSH204A-C20/0.03 is a 4-pole, 20A, Type A, C-curve Residual Current Circuit Breaker with Overcurrent Protection (RCBO). This advanced protective device is designed for three-phase four-wire circuits that supply modern electronic and electrical equipment. It integrates complete protection against overloads, short-circuits, and earth leakage currents (30mA) into a single compact unit. The key feature is its Type A residual current detection, which is sensitive to both sinusoidal AC residual currents and pulsating DC residual currents. This makes it essential for protecting circuits that feed loads containing rectifiers, switch-mode power supplies, or variable frequency drives (VFDs), where standard Type AC protection may fail.
