Starting at $440.00
  • Usually ships in 3-5 weeks



  • 35mm DIN rail mounting
  • Polycarbonate case
  • 0.14 to 2.5mm² wire capacity
  • -49 to 158°F (–45 to 70°C) operating temperature
  • 10.0V dc minimum input voltage
  • Foundation fieldbus H1, Profibus PA and IEC 61158-2 networks


The MTL F300 Megablock wiring hubs are DIN-rail mounted passive hubs designed for use in Zone 2 and Division 2 Foundation fieldbus H1 and Profibus PA networks. They provide a simple means of connecting field devices to the network trunk cable, and they protect the segment from spur short circuits. The choice of rising cage clamp screw or spring clamp terminals simplifies installation and maintenance.

Megablocks minimize hand wiring and allow individual devices to be added to and removed from the segment without disrupting network communication. A green power LED on each unit indicates whether at least 10V DC is present. F300 Megablocks are available in four, eight and twelve drop versions.

The F300 Megablocks feature built-in SpurGuard, a device-port, short circuit protection technique that minimizes susceptibility to single points of failure. SpurGuard protectors prevent a short circuit in any of the individual field devices or spur cable runs from bringing down the entire fieldbus segment. A red LED near each spur connection indicates that a spur is shorted and is in "overcurrent" mode. The optional FS32 modules can provide surge protection for the F300 products on both the trunk and spur terminals. These pluggable modules are simple to fit in a new installation, or as a retrofit option.

A range of MTL process junction boxes in stainless steel and carbon loaded, glass-reinforced polyester are available for mounting Megablock wiring components. They offer plenty of space for termination and wiring, making it easy to install and maintain the fieldbus system.

F300 Megablock hazardous area approvals permit installation in a variety of configurations in Zone 2 and Division 2 hazardous areas. Typically, F300 Megablocks may be installed with non-sparking (non-arcing) trunk and spur connections. Alternatively, when connected to suitably certified fieldbus power supplies, the trunk may be non-sparking (non-arcing) with non-incendive or intrinsically safe Ex ic spur connections.