Foundation fieldbus 1 pair A, B or high-speed

Foundation fieldbus cable is available in three ranges: type A (can also be known as Profibus PA), type B or high-speed. The PE version is suitable for use in ducts, LSZH provides increased safety in the case of fire and SWA is suitable for direct burial applications. Multi pair versions may be available in some types.

These single pair foundation fieldbus cables are designed for use in process automation industries such as Chemical, Food, Oil, Gas, Paper, Metals and Minerals. 

Note: low smoke zero halogen / halogen free (LSZH, LSOH, LSHF, OHLS) should not be confused with LSF (low smoke and fume), an in-depth explanation is shown on our LSZH Control Flex front page.


Construction – Foundation fieldbus
solid or stranded plain or tinned copper conductors
core insulation material varies
2x cores twisted into 1x pair 
collective aluminium/polyester foil tape (CAT) screen
tinned copper drain wire or tinned copper wire braid (TCWB) screen
orange, blue or black outer sheath, material varies


Technical – Foundation fieldbus
conductor sizes: type A = 18awg (solid or stranded) 
  type B & high-speed = 22awg (stranded) 
as AWG chart, see Stranding/Resistance page
conductor make-up: as detailed on specification, see PDF data sheet below 
speed per second: high-speed = 1.0 & 2.5MBits, others = 31.25 KBits
voltage rating: 300V or 600V, please check if critical
impedance: type A = 100 Ohms, others = 150 Ohms
temperature range: usually -20°C to +70°C, please check if critical
based on Belden no’s: type A = 3076F, type B = 3077F, high-speed = 3078F
core identification: coloured blue & orange


A printable specification is available here: Foundation fieldbus 1 pair type A, B or high-speed.


For more bus cables return to the Fieldbus Cables front page.


All measurements should be considered nominal and images for illustration purposes only. Although Central Cables Ltd has made every reasonable effort to ensure its accuracy, the information contained herein is subject to error or omission and to change without notice. In no event will Central Cables Ltd be liable for any damages whatsoever, arising in connection with the information described.