Leakage current measurement in transformerless photovoltaic (PV) inverters for residential market.

LDSR - Photovoltaic inverters leakage current sensors

The LDSR product family is designed for the measurement of DC, AC, and pulse currents of 0.3 ARMS nominal, providing galvanic separation between the primary and secondary circuits. These current sensors are specifically tailored for single-phase systems and are primarily used for earth leakage current measurement in solar applications.

LDSR sensors operate with a single +5 V supply and have an operating temperature range from -40 to +105°C. They are designed for PCB mounting. 

Utilizing closed loop Hall effect sensor technology, the LDSR series ensures reliable and precise current measurements, making them well-suited for renewable energy applications.

LDSR – Features and benefits

LDSR photovoltaic inverter leakage current sensors


  • Closed loop Hall effect (compensated) current sensors
  • Voltage output
  • Single supply voltage
  • PCB mounting
  • Isolation test voltage: 1.71 KVrms / 50Hz / 1 min
  • Bandwidth DC to 2 KHz (- 3 dB)
  • Closed-loop Asic
  • High creepage and clearance distances (7.1mm) for high insulation


  • Very low offset drift temperature coefficient
  • High overload capability
  • High insulation capability
  • Reference pin with two modes, Ref IN and Ref OUT
  • Test winding
  • Bandwidth DC to 2 KHz (- 3 dB)
  • Closed-loop Asic
  • High creepage and clearance distances (7.1mm) for high insulation

Typical applications

The LDSR sensor family finds ideal application in various renewable energy contexts, including:

  • Leakage current measurement in transformerless PV inverters
  • 3 phases plus neutral
  • First human contact protection of PV arrays
  • Failure detection in power sources
  • Symmetrical fault detection
  • Current leakage detection in stacked DC sources
  • Single phase nominal current measurement up to ±30 A per wire (DC or AC)

LDSR transducers - Standards compliance

LDSR Series
EN 50178
UL 62109-1
European Directive EMC 2004 / 108 / EEC: CE marking
Low voltage directive 2006 / 95 / EEC
Safety IEC 61010-1

LEM LDSR – Download & Technical Characteristic

ProductDocumentPrimary nominal RMS voltageSupply Voltage rangeOp. Temperature
LDSR 0.3-NPDatasheet
0.3 A5 to 5-40 to 105 °C
LDSR 0.3-TP/SP1Datasheet
50 A5 to 5-40 to 105 °C


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