RH-3, RH-3-2

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Product Bar End

RH-3, RH-3-2

Differential Pressure Switch RH-3, RH-3-2

Differential Pressure Switch


The RH-3 Series Differential Pressure Switches monitor low-air pressure, vacuum, or differentials of air pressure. These switches are commonly used to prove blower operation, to sense dirty filters, and to monitor pressure drop across coils. Both the Model RH-3 switch and Model RH-3-2 switch are shipped with 1/4" compression fittings, suitable for use with 1/4" OD copper or plastic tubing, and a 12" (30.5 cm) length of 1/4" plastic tubing.


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QtyModelDescriptionIn StockList PriceInternet Price
RH-3 DIFF PRESS SW, ADJUST, 0.05-12 INCHES WCIn Stock94.8653.12
RH-3-2 DIFF PRESS SW, ADJUST, 0.05-2.0” WCIn Stock113.2263.40
RH-3-2-C DIFF PRESS SW, ADJUST, 0.05-2.00” WCIn Stock124.4469.69
RH-3-C DIFF PRESS SW, ADJUST, 0.05-12.00” WCIn Stock129.5472.54


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Relay Type : SPDT

Relay Rating : 0.5A @ 24V AC/DC, 15 A resistive @ 120-277VAC

Calibration :RH-3-2 Adjustable, 0.05 to 2.0" WC

Differential :

RH-3 :Fixed progressive, 0.05" to 2.0" WC over SP range

RH-3-2 :Fixed progressive, 0.02" to 0.8" WC over SP range

Reset :Automatic reset by differential

Sensor Type :Silicone Diaphragm

Operating Pressure Range :0.05 to (12" WC or 2.0" WC)(See ordering)

Overpressure: (Burst) 13.85"WC (3.45kPa)

Max Operating Pressure :(Proof) 13.85"WC (3.45kPa)

Operating Temperature :-40° to 180℉ (-40° to 82℃)

Operating Humidity :10 to 90% Non-condensing

Media Compatibility :Inert dry air

Process Connection :1/4" compression

Wiring Terminations :3 Terminals

Mounting Vertical:2 tabs w/Holes 0.19" (0.48cm)

Enclosure Rating :NEMA 1

Dimensions :4" w x 6.1" h x 1.69" d, (10.2 x 15.5 x 4.3 cm)

Weight :2.0 lb (0.9 Kg)

Approvals : UL listed, file #MH10196, CSA

Warranty :2 year


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document   RH Spec Sheet