Dwyer APS-550 is an Adjustable Pressure Switch suitable for both liquids and gases, with a temperature range of -65 to 225°F (-54 to 107°C). Its 3-wire, 20 AWG insulated electrical connections offer a length of 12" (30 cm), and it has a 1/8" male NPT process connection. The switch has a SPDT snap action type with a field adjustable set point and a set point change of up to 2% when used under -10°F (-23°C) or above 125°F (52°C). The switch has an electrical rating of 5 A @ 250 VAC, 3 A @ 28 VDC, and can handle pressure/vacuum limits of up to 150% of the range.