Spare part suitable for most domestic water installations at 230V. Includes a mechanical pressure switch designed for use with domestic water systems, expansion tanks, or garden water pumps. AC pressure switch with infinitely adjustable switch-on and switch-off pressures. Single-phase pressure switch that simultaneously controls phase and neutral. Automatically activates the pump based on water pressure levels. When system pressure drops below the set cut-in point, the pump starts and stops once the desired pressure is restored.Pressure switch adjustment instructions: 1. Loosen the differential nut (2) 2. Adjust the start pressure (1) 3. Tighten the differential screw (2) to set the stop pressure For pumps exceeding 1.1 kW, an external contactor or standard power relay must be installed upstream. Three-phase 380/400V pumps require a compatible 380V power connection.Product specifications: - Model: SK-9 - Voltage: 230V, 1-phase - Application: Domestic pump, well pump control - Reference number: 50622 - WEEE registration number: DE45283704 - Quantity per package: 1 - Material: Metal / Plastic - Color: Black - Protection class: IP44 (splash proof) - Input voltage: 220–240V - Maximum current: 10 A - Connection size: 13 mm (1/4 inch) - Operating temperature range: 0–55°C - Maximum operating pressure: 6 bar - Pressure adjustment range: 1.4–4.1 bar - Start pressure adjustment range: 1.4–2.8 bar - Device type: Pressure switch - Connector: Not included - Function: Pump control / Pressure switch - Max load: 10 A, single-phase - Weight: 0.376 kg - Package dimensions: 110 mm (H) x 105 mm (L) x 65 mm (W)