Schneider Electric XB4BD21 Harmony XB4 Selector Switch 2-Position Stay Put 1 NO Black Metal Bezel. The Schneider Electric XB4BD21 is a robust and reliable Harmony XB4 selector switch, meticulously engineered for industrial control applications. This complete product features a durable chromium-plated metal bezel and a black standard handle, designed for a 22.5 mm mounting diameter. It offers two stay-put positions with a 90° rotation, equipped with one normally open (NO) slow-break contact, making it ideal for mode selection and control signal initiation in various machinery. The XB4BD21 ensures exceptional environmental protection with an IP69, IP69K, and IP67 rating, complemented by UL Type 4X/13 enclosure compatibility, making it suitable for harsh conditions. It boasts a high mechanical durability of 1,000,000 cycles, a rated insulation voltage (Ui) of 600V, and a conventional free air thermal current (Ith) of 10A. With screw clamp terminals for secure connections, this selector switch is a versatile component for control panels in industries across Egypt and the Gulf, including oil and gas, water treatment, cement, food and beverage, and building services.