TT13A3T04 is a single-pole single-throw (SPST) toggle switch from the TT Series (Tiny) manufactured by TE Connectivity/Alcoswitch. This switch features an "A" function action (On None Off) with a long actuator and wire lug terminals designed for reliable panel-mount installation. The switch has a 10-48 UNS-2A threaded mounting hole and oblong terminal holes measuring 0.040 inches wide by 0.080 inches long (1.00 mm × 2.00 mm). The actuator is flat-topped with a height of approximately 0.172 inches (4.37 mm) and a width of 0.236 inches (5.99 mm), providing ergonomic control. This switch is commonly used in industrial control panels, instrumentation, and equipment requiring simple on/off switching with a rated current capacity of 0.4 VA to 3 Amps, making it suitable for low to moderate power applications.