Air Compressor Pressure Switch SPC Series | SPC-103 to SPC-130 | AC125V to 250V

This SPC series mechanical pressure switch controls the upper and lower pressure limits of an air compressor, water pump or refrigeration circuit through a relay signal output. It runs on AC125V to 250V, is rated for fluid temperatures of -10°C to 100°C, and comes in five models, SPC-103 to SPC-130, with a choice of G1/4 or G1/2 connection. Features and benefits: - Two adjustable setpoints: the upper pressure limit and the pressure differential are set separately with screws on top, so the lower limit is the upper limit minus the differential. - Built-in scale plate in bar and psig, so the setting can be read straight off the switch. - Relay signal output with differential protection, which helps stop the equipment starting and stopping too often. - Contact ratings of 20A at 125V and 10A at 250V non-inductive, and 15A at 125V and 8A at 250V on inductive loads, with 72A inrush. - Spring steel pressure element for steady control of small pressure and differential settings. - Two ways to mount: screw it straight onto the equipment by the threaded connector, or fix it anywhere with the supplied mounting plate. - Works with air, water and hydraulic pressure; the standard version suits non-corrosive media such as air and refrigerant gases, and the seller notes special models for ammonia. Applications: - Air compressor and air tank pressure control - Water pump start and stop control from pressure or water level - Refrigeration and air conditioning high and low pressure control - Water treatment and general fluid pressure control In the box: The seller lists a scale plate and pressure and differential adjustment screws with the switch, and a standard mounting plate for bracket fitting. Note: Use only one set of contacts at a time and never connect live and neutral together. The terminals carry mains voltage, so isolate the supply before wiring or adjusting, and have the wiring done by a competent person. Choose a pressure range that covers your system's working pressure.