The XKA304A1AAJ21 is a snap-action change-over switch designed for reliable switching applications requiring long overtravel and snap-in mounting. It features a 250 VAC, 1 A electrical rating with a snap-action mechanism incorporating a stainless steel tension spring, silver contacts, and a polyamide (PA) housing and plunger. The switch operates at a maximum temperature of 85 °C, provides IP 40 enclosure protection, and achieves a mechanical life of 3×105 cycles minimum with a glow-wire rating of 850 °C and tracking resistance of PT1 175. With its compact dimensions of 28 × 20 × 15 mm, tab terminals, and snap-in mounting, this switch is ideal for industrial control panels, appliances, and safety-critical applications where reliable change-over switching and long contact life are essential.