The ABB CT‑ERS.22 is a compact, single‑function electronic ON‑delay timer relay. When control supply voltage is applied, the relay waits for a user‑selected delay time, then changes its output contacts from their default state. Its slim 22.5 mm width and DIN‑rail mountable housing make it suitable for installation in control panels, automation cabinets, and other industrial or commercial electrical control systems. The relay supports a wide supply‑voltage range, accommodates many delay‑time settings, and uses SPDT (change‑over) contacts to control downstream loads or contactors, making it a versatile timing device for automation, motor control, lighting, sequential logic, and general‑purpose time‑delay applications.