Liberty 120 is a single-phase, single-element smart meter that provides flexibility through a modular design to accommodate the latest cellular communications technologies.  Liberty 120 paves the way for reliable data transfer, making it the ideal solution for AMI applications.

The meter supports remote firmware upgrade, allowing metering and communications features and functionality to be updated in the field. This enhances flexibility, and makes the utility’s investment future-proof.

Liberty 120 is an integrated part of Secure’s Liberty Online advanced metering solution.



    • Domestic and small commercial premises
    • Credit and PAYG applications
    • Advanced metering infrastructure (AMI)
    • Suitable for co-generation metering applications
  • Features

    • Meets the minimum services specification as per Australian National Electricity Rules (NER)        
    • Multi-operator (roaming) SIM support – ensures maximum network coverage
    • Credit and Pay As You Go (PAYG) mode (remotely switchable between these modes)
    • Peak and off-peak tariff management
    • Remote de-energisation and energisation (direct and arm)
    • Alerts to identify potential anomalies
    • Consumer friendly displays
    • QoS (Quality of Supply) monitoring
    • Modular communications
  • Benefits

    • Better information on usage to help manage energy consumption          
    • Improved billing cycle and accuracy        
    • Facilitates supply connection/disconnection remotely
    • Power outage management – quick response time        
    • Remote reconfiguration
    • Low cost of ownership
      • Removes cost of manual read
      • Designed to serve long life in field
      • Remote firmware upgrade
    • Specification
    • Electrical

      Connection type

      1-phase, 2-wire, active neutral, direct connected

      Measuring elements

      1 element

      Rated voltage (Vnom)

      230 V AC, -20% to +15%

      Maximum voltage

      300 V (L-N) continuous

      Impulse withstand

      12 kV, 9 J, as per NMI M6


      50 Hz ±5%

      Current range

      10 A Ib, 100 A Imax


      Class 1.0 (Active Energy), Class 2.0 (Reactive Energy)

      Metrology Lamp

      Two configurable metrological LEDs for active and reactive energy



      AS 62052.11, AS 62052.21, AS 62053.21, AS 62053.23, NMI-M6

      Exceeds minimum services specification, as per the National Electricity Amendment (expanding competition in metering and related services)

      Data storage capacity

      Energy/demand load profile

      395 days (per channel) at 30-minute interval (configurable), up to 4 channels

      Quality of supply (QoS) parameters

      90 days (per parameter) at 30-minute interval (configurable), up to 8 parameters, including minimum, maximum and average voltage, current, phase angle, temperature


      Mains supply contactor

      100 A


      Dimensions (W x H x D)

      146 mm x 211 mm x 65 mm


      Flame-retardant polycarbonate


      Terminal cover, meter main cover, configuration button, communications module


      0.9 kg (approx.)


      10-character alphanumeric starburst display with backlight and icons for status


      12-key (0-9, A, B) for local entry of PAYG code and access to displays



      ANSI optical port (AS 62056.21)


      3G/4G WAN, build option for ZigBee® HAN

      Multi-operator (roaming) SIM support

      Hot-swappable field interchangeable module, sealable separately


      AES128 encryption, cover open detection

      Outage notification

      Last gasp power supply (build option)


      Real-time clock type

      Crystal or mains-synchronised

      Power source

      Mains supply


      Lithium battery, 15-year life


      AS 62054.21


      Ingress protection

      IP 53

      Insulation class

      Protective class II


      Operating: -10 °C to +60 °C

      Storage: -25 °C to +70 °C


      95%, non-condensing