Schneider Electric XB4BA51 Push-button, yellow flush, unmarked, 1 NO, 22.5mm. The Schneider Electric part number XB4BA51 is a robust Harmony XB4 series 22.5 mm metal-bezel push-button, engineered for reliable control in demanding industrial environments. This complete product features a flush yellow, unmarked operator profile with a spring return mechanism, and is equipped with a single Normally Open (1 NO) slow-break contact, perfect for general control applications. Its chromium plated metal bezel and Zamak fixing collar ensure exceptional durability, while comprehensive IP66, IP67, IP69, and IP69K protection ratings, alongside IK06 impact resistance, make it highly resistant to dust, water jets, and impacts. The XB4BA51 operates reliably in temperatures ranging from -40 to 70 °C, offering a mechanical durability of 10 million cycles. With a rated insulation voltage of 600 V and a rated operational current of 3 A at 240 V AC-15, this push-button is well-suited for various control circuits. Applications in Egypt and the Gulf include machinery control in cement plants, oil and gas facilities, water treatment plants, food and beverage processing, textile factories, and building services. Wiring is simplified with secure screw clamp terminals. For a high-performance, long-lasting control solution, the Schneider Electric XB4BA51 is an excellent choice.