• Input voltage (DC)
    • 19.2 to 30V for F101 and F102 modules
    • 10 to 30V for F104 modules
  • Output voltage (DC)
    • 21.5 to 24V for F101 modules
    • 27.9 to 30V for F102 modules
    • 13 to 14V for F104 modules
  • One channel
  • Design current per segment
    • 0 to 500mA for F101 and F102 modules
    • 0 to 250mA for F104 modules
  • Segment current limit
    • >550mA for F101 and F102 modules
    • >280mA for F104 modules
  • Operating temperature range
    • -40 to 149°F (–40 to 65°C) for F101 and F102 modules
    • -40 to 158°F (–40 to 70°C) for F104 modules
  • IP20 to BS EN 60529
  • Fully isolated


The MTL single segment fieldbus power supplies are designed to provide power for a single Foundation fieldbus H1 segment. Galvanic isolation, power conditioning and segment termination are incorporated into each F101, F102 or F104 module. Termination of the fieldbus segments is normally enabled with a switch on the module, but may be switched off for those few applications that do not require a terminator at the fieldbus power supply.

The modules use passive components for power conditioning and a reliable DC/DC converter to provide galvanic isolation and power regulation. The connectors used for power input and the fieldbus are high-quality pluggable types with screw retention. Spring-clamp and screw-terminal connector versions are supported.

The F101 module is intended for use in applications that require live-workable, energy-limited spurs in hazardous areas, where field devices are certified for up to 24V input. When used with Megablock wiring hubs with SpurGuard short circuit protection, the spurs are compatible with typical non-incendive and intrinsically safe fieldbus instruments in Zone 2 and Division 2.

The F102 module is intended for all general-purpose applications. It has a high output voltage and is capable of powering heavily loaded segments and long cable lengths. It can also support energy-limited spurs with fieldbus devices having Ui≤ 30V.

The F104 Eco Power module has low current consumption and is designed for use in applications where energy efficiency is important. Typical uses are wind- or solar-powered applications such as instrumentation nodes for remote wellheads. High efficiency is achieved by providing a lower output voltage to the fieldbus segment than with conventional fieldbus power supplies, eliminating unnecessary power dissipation in the fieldbus instruments. The 13V nominal output is sufficient to support up to 10 typical fieldbus instruments on a 200m trunk cable.


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