This is a differential pressure switch, model RT263AL. It has a wide range of applications in pressure - related control systems. The maximum test pressure Pe is 8 bar, equivalent to 116 psig. The highest working pressure is 7 bar (101 psig), which ensures its reliable operation under normal working conditions. The enclosure protection class is IP66, providing excellent protection against dust and water ingress, making it suitable for use in harsh environments. Regarding the ambient temperature range, it can operate in temperatures as low as -50 °C (-58 °F) and as high as 70 °C (158 °F), which expands its usability across different climates and industrial settings. The electrical specifications are in compliance with EN 60947 - 4/-5. The electrical connection is in the form of cable thread connection, with a size of 2xPg 13.5 and an internal thread connection form. The connection standard follows DIN 40430. In terms of EN 60947 wiring properties, it supports flexible wires with ferrules (0.2 - 1.5 mm²), flexible wires without ferrules (0.2 - 2.5 mm²), and solid / stranded wires (0.2 - 2.5 mm²). The electrical insulation is rated at 400V, with a pollution degree of 3 and a rated impulse voltage of 4 kV. There is a short - circuit protection with a 10A fuse. The contact function is SPDT (Neutral Zone), and the contact capacities are AC15 = 3 A, 400 V; AC1 = 10 A, 400 V; AC3 = 4 A, 400 V; DC13 = 12 W, 220 V; LR = 28 A, 400 V. For the pressure - related parameters, the pressure connection type is G, with a size of 3/8 and a connection standard of ISO 228 - 1. The pressure connection is an external thread. The differential pressure setting range is from 0.1 bar to 1 bar (equivalent to 1.5 psi - 14.5 psi in pounds per square inch gauge), and the contact hysteresis is 0.05 bar. The switch is repairable for the contact system. This product meets multiple international standards such as CCC, CE, EAC, RoHS (both EU and China), etc., ensuring its quality and safety.