The Terasaki ESM-1101 is a genuine Operation Module Printed Circuit Board (PCB) designed as a crucial control component for Terasaki electrical systems, commonly found in their range of Air Circuit Breakers (ACBs). This board is engineered for reliability, managing the operational logic and control functions of the host equipment. Featuring high-quality NAIS electromechanical relays and robust passive components, the ESM-1101 ensures precise and dependable performance. It serves as a direct replacement part, identified by part number K/002/1-001A, making it ideal for maintenance, repair, and refurbishment of compatible Terasaki industrial switchgear.