Skip Ribbon Commands
Skip to main content
  • Product Info
  • Literature


Three-port relays are used in HVAC systems, to perform a variety of relay functions, such as; transmit the higher of two input signals, lock out one pressure signal when a second signal is higher, or transmit the lower of two pressure signals.


  • Uses diaphragm-logic technology.
  • In-line, wall, or panel mounted.
  • Sharp-barb air connections.
  • Molded plastic construction.

Product Specifications

Pneumatic Three-port Selector Relay
Dimensions (in.)
1 1/2 in. diameter x 1 in. deep
Dimensions (mm)
38 mm diameter x 25 mm deep
Maximum Safe Operating Pressure (psi)
30 psi, maximum
Maximum Safe Operating Pressure (kPa)
205 kPa, maximum
Temperature Range (F)
0 F to 140 F
Temperature Range (C)
-18 C to +60 C
14003030-001, 1 1/2 in. Mounting Clip for Mounting relay to wall or panel
Wall or In-line or panel
Operating Humidity Range (% RH)
5 to 95% RH
Pressure Range (psi)
Input Operating--0 to 20 psi
Pressure Range (kPa)
Input Operating--0 to 138 kPa
Air connections
Barb fittings 5/32 in. (4 mm) O.D. plastic tubing
0.039 scfm at 1 psi differential (18 mL/s at 5 kPa differential)
Lockout,Lower-of-two pressures,repeater relay
There is no literature attached to this product, please try another material search. If you believe that there should be literature for this product, please contact Customer Care for website support.