This is a differential pressure switch, model RT260AL. It has a wide range of features suitable for various applications. The maximum test pressure Pe is 25 bar, equivalent to 362 psig. The highest working pressure is 22 bar (319 psig), ensuring reliable operation under normal working conditions. The enclosure protection class is IP66, which provides excellent protection against dust and water ingress, making it suitable for use in harsh environments. The ambient temperature range is from -50 °C (-58 °F) to 70 °C (158 °F), allowing it to function in a variety of climates. For electrical specifications, it complies with EN 60947 - 4/-5. The electrical connection is via cable thread connection with a size of 2xPg 13.5, and the connection form is internal thread following the DIN 40430 standard. Regarding the contact functions, it has an SPDT (Neutral Zone) configuration. The contact capacity is diverse, with 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. The adjustment range of pressure is from -1 bar (-15 psig) to 18 bar (261 psig), and the differential pressure adjustment range is from 0.5 bar (7.3 psi) to 4 bar (58 psi). The contact hysteresis is 0.3 bar. In terms of pressure connection, the size is 3/8, the connection type is G, and it follows the ISO 228 - 1 standard. The pressure connection has some specific notes, such as using a welded reducing pipe 6.5/D10mm. The pressure connection is external thread. The switch is repairable at the contact system. As for the EN 60947 wiring properties, it supports flexible with ferrule (0.2 - 1.5 mm²), flexible without ferrule (0.2 - 2.5 mm²), and solid / stranded (0.2 - 2.5 mm²). The EN 60947 electrical properties include insulation of 400V, pollution degree of 3, rated impulse voltage of 4 kV, and short - circuit protection with a 10A fuse.