The XB4BA31 is a complete pushbutton unit from the Harmony XB4 range, featuring a green, flush, spring-return operator for momentary action. It is constructed with a chromium-plated metal bezel, fits a standard 22.5 mm panel cutout, and includes one normally open (NO) slow-break contact block with screw clamp terminals. This device offers high durability with a mechanical life of 10,000,000 cycles and an electrical durability of 1,000,000 cycles. Designed for harsh environments, it provides excellent protection with IP ratings up to IP69K, a NEMA 4X rating, and an operating temperature range of -40 to 70°C, making it suitable for industrial control applications requiring robust performance.