- 2” W.C. to 20” W.C.
- SPDT Sw 5A @ 120 Vac 3A FLA
- NEMA Type 4
- Threaded Connection
- Formerly: 254-394A
the DUNGS AA...A2/A4 differential pressure switches are field adjustable, compact pressure
switches for automatic gas burning equipment controls. Available with hose or NPT threaded
AA...A2/A4 differential pressure switches are suitable for making and/or breaking a circuit
when the medium pressure changes relative to the set point.
Differential pressure monitoring in firing, ventilation and air-conditioning systems. The AA...
A2/A4 can be used as a pressure, vacuum or differential pressure switch for air and nonaggressive
gases. Not suitable for natural gas, propane, butane and other combustible gases.
Max. Operating Pressure
AA…A2/A4 7 PSI (500 mbar)
Silver (Ag) Contact ratings
AC 5A resistive @ 120 Vac
AC 3A inductive @ 120 Vac
DC min. 20 mA @ 24 Vdc
DC max. 1 A @ 48 Vdc
NEMA Type 4
Ambient Temperature Rating
-40 F to +140 F (-40 C to +60 C)
Air pressure switch for differential, vacuum or positive pressure; with automatic reset; AA-A2-4 features 0.16“ (4 mm) diameter hose connections; AA-A2-6 features 1/4” NPT positive connection and 1/8” NPT negative connection and includes a test button in the lower housing; both models feature field adjustable setpoint; AA-A4-4 models feature 1/4” NPT positive connection and 1/8” NPT negative connection with Die Cast Aluminum Base; 1/4" x 1/32" (6.3 x 0.8 mm) flat male terminals.