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10-20 Zone Expansion Unit for NC910F or NC920F


  • Expands the number of zones on an NC910F or NC920F Call Controller by 10 or 20 zones (dependent on model purchased).
  • Housed in an attractive surface mounting plastic enclosure measuring just 214mm x 178mm.
  • Includes 10 or 20 Zonal Alarm LEDs capable of indicating Standard and Emergency Calls. Note this expansion controller does not include on onboard buzzer as audible call indication will come from the master controller it is connected to.
  • NC910EF provides 10 extra zones, NC920EF provides 20 extra zones.
  • Innovative slide-in labelling system.
  • Optional horizontal (NCBOXAS) and vertical (NCBOXAL) alignment plates available to aid the installation of controllers and expansions units located alongside each other.



Quiescent current 0mA (none).
Alarm current Determined by the number/type of field devices connected to the call controller/system.
Indicators Green Power on LED; 10 (NC910EF) or 20 (NC920EF) red Zonal Alarm LEDs (lit steady for a Standard call, pulse for an Emergency call); Audible call indication will come from the separate master call controller.
Controls None. 2 Buttons – (A) Reset or inactive ; (B) ‘Mute’ or ‘Call Accept’ available via NC910S or NC920S master controller.
Call acknowledgement functionality Yes.
Product dimensions (mm) 214 W x 178 H x 70 D mm (overall). Hole required for flush mounting is 176 W x 162 H x 55 D mm.
Construction & finish Plastic detachable lid and back box. RAL7035.
IP Rating IP41.
Weight 1.47kg.
Operating conditions/temperature -5ºC to +40ºC. Max. relative humidity 95% non-condensing.


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