• LEM055 Series Front Panel Mounted Single Phase Electronic Energy Meter


The LEM055 series multi meter is front panel mounted single phase electronic active energy meters. LEM055 series multi meter adopts many advanced technologies of research and development, like microelectronic-techniques, specialized large-scale IC (integrated circuit), digital sampling and processing technology, SMT technique, and so on. Their technical performances for the LEM055 series multi meter completely conform to International Standards IEC 62053-21 for Class 1 single phase active energy meter. LEM055 series multi meter can directly and accurately measure the load active energy consumption in the single phase AC networks of rated frequency 50Hz or 60Hz and used indoors or in the meter box outdoors. The LEM055 series multi meter has multiple configurations for option, to be suitable with the various market demands. LEM055 series multi meter has features with excellent long-term reliability, small volume, light weight, perfect appearance, easy installation, etc.

Functions and features

√ LEM055 series multi meter; Front panel mounted in 3 points for fixing, the appearance and dimensions are in accordance with Standards BS 7856 and DIN 43857.
√ LEM055 series multi meter; The meter cover and terminal cover can be made from the transparent anti-ultraviolet PC pressed in a whole-module. The meter bottom and terminal block can be made from the dampproof, fire-retardant, thermostability and good Bakelite, with the features of good weather resistance, high rigidity and excellent insulation, etc.
√ LEM055 series multi meter; 6+1 digits (999999.1kWh) LCD display.
√ LEM055 series multi meter; Can select the maintenance free lithium battery inside for LCD display to read the meter while the power is cut.
√ LEM055 series multi meter; Equipped with a polarity passive energy impulse output terminal, conforming to Standards IEC 62053-31 and DIN 43864.
√ LEM055 series multi meter; Standard configuration is: only one (red) LED indicates the energy impulse signal (red). You can add a (green) LED to indicate the power state and a LED to indicate automatic detection for the load current flow direction (yellow LED means the reverse current flow) when ordering.
√ LEM055 series multi meter; Measure the active energy consumption in one direction on single phase two wire or single phase three wire, which is not related with the load current flow direction at all, complying with Standards IEC 62053-21.
√ LEM055 series multi meter; Direct connection. For single phase two wire, two types of connections: type 1A and type 1B for option. For single phase three wire, the connection is type 2A.
√ LEM055 series multi meter; Extended terminal cover for safety.

Technical parameters

    Technical parameters
Model Accuracy Reference voltage (V) Current specifications (A) Starting current (A) Insulation performance
LEM055XX Class 1 127 or 230 5(30)
AC voltage 4kV for 1 minute, 
1.2/50us waveform impulse voltage 6kV.

Outer and mounting dimension

Outer and mounting dimension

Wiring diagram

  Wiring diagram -1 (type 1B)
Terminals Note
1 Inlet phase wire
3 Outlet phase wire
4 Inlet neutral wire
6 Outlet neutral wire

  Wiring diagram -2 (type 1A)
Terminals Note
1 Inlet phase wire
3 Inlet neutral wire
4 Outlet neutral wire
6 Outlet phase wire
2and 5 Passive energy impulse output port

  Wiring diagram -3 (type 2A)
Terminals Note
1 Inlet on Phase wire L1
3 Inlet on Phase wire L2
4 Outlet on Phase wire L2
6 Outlet on Phase wire L1
2and 5 Passive energy impulse output port

Product configuration table

  Product configuration table
Configuration Options Configuration Code
Meter cover and terminal cover made from the transparent 
PC. Meter bottom and terminal block made from the good quality Bakelite.
6+1 digits LCD/td>
LCD display to read the meter when power is cut/td>

LCD display to read the meter when power is cut

Measuring the active energy on single phase two wire

Wiring diagram -1 (type 1B)

Wiring diagram -2 (type 1A)

Wiring diagram -3 (type 2A)