Schneider Electric XB4BP21 XB4 Push Button, Metal, Projecting, Black, 22.5mm, Spring Return, 1NO. The Schneider Electric XB4BP21 is a robust Harmony XB4 series metal push button designed for reliable control in industrial environments. This 22.5mm mounting diameter component features a black, projecting, unmarked operator with a clear boot, ensuring clear visual identification and protection. Engineered for durability, the XB4BP21 boasts a chromium-plated metal bezel and a spring-return mechanism, offering precise 1 NO (normally open) slow-break contact operation. It is equipped with screw clamp terminals for secure wiring and offers an impressive mechanical durability of 10,000,000 cycles and electrical durability of 1,000,000 cycles. With an IP66/IP67 degree of protection and IK06 impact resistance, it withstands harsh conditions, making it ideal for applications in cement plants, oil and gas facilities, water treatment, food and beverage processing, textiles, and building services throughout Egypt and the Gulf. Its 10A conventional free air thermal current and 600V rated insulation voltage ensure reliable performance.