The IDEC GT3 A-4 AF20 is a versatile plug-in timer with an 11-pin base, designed for a wide range of timing functions. It supports four selectable operation modes and features external start, reset, and pause inputs. The unit provides clear indication of power and output status via LEDs and operates within a time range of 0.05 seconds to 180 hours on a 100-240 VAC input voltage. Its DPDT contacts allow for delayed response in various configurations, enhancing its adaptability for complex control systems.