E121SD3V3GE is a sealed snap-acting momentary pushbutton switch featuring single-pole double-throw (SPDT) contact configuration designed for instrumentation, telecommunications, and computer peripheral applications. The switch incorporates a disposable splashproof boot with epoxy seal for process sealing to withstand machine soldering temperatures and pressure wash cleaning methods. It is equipped with a vertical V-bracket termination (V3 option with 0.460 inch dimension A) for PC mounting, gold contact material with matte-tin plating, and operates reliably over a temperature range of -30°C to 75°C. The switch delivers 1 ampere contact rating at 120 V AC or 28 V DC, with contact resistance below 50 mO typical and an electrical life of 60,000 make-and-break cycles at full load, making it suitable for demanding industrial and commercial control applications.