Expands the number of zones on an NC910F or NC920F Call Controller by 20 zones
Housed in an attractive surface mounting plastic enclosure measuring just 214mm x 178mm.
Includes an onboard buzzer and 10 or 20 Zonal Alarm LEDs capable of indicating Standard and Emergency Calls.
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); Internal buzzer (on steady for any Standard call, intermittent for any Emergency call).
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.