The DUNGS GAO (Automatic Reset), GMH (High Manual Reset), and GML (Low Manual
Reset) A4 pressure switches are adjustable pressure switches for automatic gas burning
equipment controls. A4 pressure switches are suitable for making and/or breaking a circuit
relative to changes in medium pressure relative to the set point. The set point can be set in
the field by an adjustable dial with an integrated scale. Test nipple integrated in metal housing
to verify setpoint.
Application
The DUNGS GAO, GMH, and GML A4 pressure switches are recommended for industrial
and commercial heating applications with 1/4” NPT pipe connections. The GAO, GMH, and
GML A4 pressure switch is suitable for natural gas, propane, butane, air and other inert
gases.
Max. operating pressure
GAO; GMH; and GML A4-4-2,3,4,5,6
7 PSI (500 mbar)
GAO, GMH and GML A4-4-8
14 PSI (1000 mbar)
Silver (Ag) contact ratings Gold (Au) contact ratings
Electrical ratings
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