The LEM171 series electrical meter is socket mounted single phase electronic active energy meters. LEM171 series electrical 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. LEM171 series electrical meter technical performances completely conform to International Standards IEC 62053-21 for Class 1 single phase active energy meter and Standards ANSI C12.16 - 1991. LEM171 series electrical meter can directly and accurately measure the load active energy consumption in the single phase three wire AC networks of rated frequency 50Hz or 60Hz and used indoors or outdoors. The LEM171 series electrical meter has multiple configurations for option, to be suitable with the various market demands. The LEM171 series electrical meter have features with excellent long-term reliability, small volume, light weight, perfect appearance, easy installation, etc.

√ LEM171 series electrical meter; Socket mounted. The meter cover is made from transparent anti-ultraviolet PC. The terminal block is made from black fire-retardant glass fiber reinforced PC, with the features of good weather resistance, anti-impact and excellent appearance, etc. complying with Standards ANSI C12.10 – 2004.
√ LEM171 series electrical meter; 5+1 digits (99999.1kWh) LCD.
√ LEM171 series electrical meter; Can select the real-time power measurement function, 2 decimals for 0 ~ 9.99kW, A decimal for 10.0 ~ 99.9kW.
√ LEM171 series electrical meter; Can select the maintenance free lithium battery inside for LCD display to read the meter while the power is cut.
√ LEM171 series electrical meter; Can add LCD backlight to read meter conveniently.
√ LEM171 series electrical meter; LED indicates separately the energy impulse signal (red) and the load current flow direction (yellow).
√ LEM171 series electrical meter; Automatic detection for the load current flow direction and will be indicated by LED (LED lighting means reverse current flow)
√ LEM171 series electrical 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 and ANSI C12.16 – 1991.
√ LEM171 series electrical meter; Direct connection. For single phase two wire meter, the connection type is 1S. For single phase three wire meter, the connection type is 2S.

Wiring diagram -1 (type 2S)

Wiring diagram -2 (type 1S)