Key Features

  • 1 x class A NAC output circuit (1A maximum load)
  • Designed to meet UL864 10th Edition requirements
  • Can be programmed as a 24v auxiliary (1A maximum load)
  • Quick and easy to install
  • Extensive front unit status indications


The Velocity Class A Notification Appliance Circuit Module (VL-NCA) provides power for, and handles communications to, the non-addressable notification appliances in a Velocity fire detection system. This module has one notification circuit and that can be wired in class A configuration and can handle up to 1A. The circuit is monitored for open, short and earth trouble conditions and reports the current status back to the Velocity MMP control panel.

The VL-NCA module can also be programmed as a 24v auxiliary special application class A output which can be used to provide power to external equipment.


All components in the Velocity range are UL certified and comply with the requirements of Underwriters Laboratories (UL) 864 Control Units and Accessories for Fire Alarm Systems 10th Edition.

Tech Specs

Design StandardUL864 10th Edition
ApprovalUL Laboratories
Circuit TypeRegulated 24V DC
Power Limited & Supervised
Maximum NAC Current1A
Maximum RMS Current for a Single Notification Appliance700mA
Maximum Line Impedance1.8Ω total (0.9Ω per core)
Wiring Class1 x Class A [Power limited & Supervised]
Special ApplicationsAuxiliary 24V DC Output [Power limited & Unsupervised]
SynchronisationSelectable at each module as:
Sounder (uses synchronisation protocol for horn strobes)
Bell (will pulse the output voltage to give the required temporal pattern)
Operating Temperature0°C (32°F) to 49°C (120°F)
Max Humidity93% Non-Condensing
Dimensions (W x H x D)57mm x 105mm x 47mm
Terminal Wiring Size18 AWG to 14 AWG (0.8mm² to 2.5mm²)



Velocity Class A Notification Appliance Circuit Module

Velocity Notification Appliance Circuit Module, Class A

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