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 pressure settings. 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 stop pressure For pumps exceeding 1.1 kW, an external contactor or standard power relay must be installed upstream. Not suitable for direct control of three-phase pumps. Specifications: - Model: SK-9 - Voltage: 220-240V AC, 1-phase - Maximum current: 10 A - Connection size: 13 mm (1/4 inch) - Protection class: IP44 (splash resistant) - 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 - Housing material: Metal / Plastic - Color: Black - Weight: 0.376 kg - Package dimensions: 105 mm (L) x 65 mm (W) x 110 mm (H) Product type: Pressure switch Connector: None included Application: Pump control, pressure regulation for well pumps and domestic water systems