Print 
Email 
RH-3-2 | Columbus Electric | Pressure
Differential Pressure Switch, Adjustable, 0.05-2.00” WC, Automatic Reset, Barbed Connectors on Both Sides
Brand:Columbus Electric
MPN:RH-3-2
SKU:RH-3-2
List Price:
$140.00
Today's Price:
$72.80
product specifications
Contact Rating
15 A
Contact Type
SPDT
Approvals
UL,CSA
Connection
1/4 in OD Tubing
Direction
Uni-Directional
Housing Material
Metallic
Housing Rating
NEMA 1
Measurement
Inches of Water Column
Media Compatibility
Air
Override
Automatic
Range
±5 in WC
Supply Voltage
277 VAC
Type
Adjustable
Power Required
Switch
Set Point Range
0.05-2 in
product series specifications
Relay Type: SPDT
Relay Rating: 0.5A @ 24V AC/DC, 15 A resistive @ 120-277VAC
Motor Rating: 1/4 HP @125 VAC, 1/2HP @ 250 VAC
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°F (-40° to 82°C)
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
more information & related documents
Series Description
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 in compression fittings, suitable for use with 1/4 in OD copper or plastic tubing, and a 12 in (30.5 cm) length of 1/4 in plastic tubing.
Kele Description
DIFF PRESS SW, ADJUST, 0.05-2.0” WC
Manufacturer
Columbus Electric
Related Documents
RH Spec Sheet 
