The GT3A-4AD24 is a multi-mode analog timer from the GT3A series designed for flexible timing control in industrial automation and control systems. It operates at 24V AC (50/60Hz) or 24V DC with four selectable operation modes (ON-Delay 2, Cycle 2, Signal ON/OFF-Delay 1, and Signal OFF-Delay 1) accessible via an operation mode selector. The timer features a delayed DPDT contact output rated for 250V AC at 5A or 24V DC at 5A (resistive load), with an 11-pin configuration providing external start, reset, and gate inputs for enhanced control flexibility. Timing ranges span from 0.1 seconds to 180 hours with selectable time range settings, and the unit includes power and output status indicating LEDs for operational visibility. The timer delivers ±0.2% accuracy with ±10 msec repeatability across voltage and temperature variations, making it suitable for applications requiring precise timing in motor control, process automation, and sequential switching operations.