The EF19-18.9 is a self-supplied electronic overload relay designed to provide reliable and fast protection for motors against overload and phase failure without requiring external power supply. It features a wide setting range of 5.7 to 18.9 A, rated operational current of 18.9 A at 690 V AC main circuit, and selectable trip classes (10E, 20E, 30E) with temperature compensation across -25°C to +70°C operating range. The relay includes 3 poles with 1 NC and 1 NO auxiliary contact, trip-free mechanism, automatic or manual reset selection, and STOP and Test functions. Its compact dimensions (44.4 mm width × 85 mm height × 59.3 mm depth) and compatibility with standard motor applications make it ideal for industrial motor control systems, offering high accuracy and operational reliability in demanding environments.