Key Features

  • Address settable from 001 to 254 by a dedicated programmer
  • Loop powered and low standby current (3mA)
  • Mounts to optional 4-inch square junction box
  • Status indicator LED
  • Supports Class A and Class B wiring


The Velocity Addressable Zone Module is intended for use as part of an addressable two-wire fire alarm system. It can be connected to conventional detectors and monitors and transmits the status (normal, open, short or alarm) of detectors within the zone to the control panel.

It can be wired for Class A (Style D & E) and Class B (Style B & C) operation and has a built-in short-circuit isolator (SCI). The SCI prevents entire loop failure in the event of a short on the loop. 

Velocity Addressable Zone Module has a three-coloured LED to indicate the status of alarm, polling and SCI and can be mounted directly to a 4-inch square electrical box.


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

SLC Applied VoltageRated Range 20 to 38V DC
SLC Current ConsumptionStandby 2.6mA
Alarm 35.9mA (max)
SLC Line ImpedanceUp to 50Ω
Number of IDC (Initiating Device Circuit)1 x Class A or 1 x Class B
IDC Circuit Rating12 to 18V DC, 560Ω 32 mA (max)
IDC Line ImpedanceUp to 50Ω
EOL DeviceRE-10k (10kΩ, 1/4W), Class B only
SCI on Resistance0.2Ω (max)
SCI Fault Detection Threshold10V (min)
SCI Isolation Current22mA (max)
Visual Indicator (Status LED)Polling LED (GREEN)
Input LED (RED)
Ambient Installation Temperature0°C to 49°C (32°F to 120°F)
Storage Temperature-20°C to 60°C (-4°F to 140°F)
Max Relative HumidityUp to 93 % RH, non-condensing
EnvironmentIndoor dry use only
Max Quantity PerLoop 127 Units
Terminal ScrewAWG 12 to 22
Address SettingVDOT-AD2 Address Programmer
Dimensions (H x W x Dmm)124 x 124 x 34.5mm
WeightApproximately 154g




Velocity Addressable Zone Module with Short Circuit Isolator

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