The ABB GSH202 AC‑D25/0.03 is a two‑pole residual current operated circuit breaker (RCCB/RCD) designed for electrical safety in low‑voltage AC distribution systems. It provides protection against earth leakage faults by rapidly disconnecting circuits when an imbalance between live and neutral currents exceeds 30 mA, helping to prevent electric shock and reduce fire risk. The AC‑D characteristic indicates that the device is sensitive to both standard AC residual currents and high‑frequency components typical of certain load types. This compact DIN‑rail mountable unit is suitable for residential, commercial, and light industrial installations requiring enhanced earth‑fault protection.

The Schneider Electric NSX630S 3P 630A is a High-Current Air Circuit Breaker (ACB) from the Masterpact NSX series, designed for main power distribution and protection in large commercial, industrial, and critical infrastructure applications. The "S" designation indicates a Selective version with enhanced coordination capabilities.

The ABB DDO02 Digital Output Module is designed for precise control in industrial automation, offering high reliability and efficiency in handling complex control tasks.