LV25-P
LEM LV25-P closed-loop voltage transducer with a current-input design, measuring up to 500 V via R1 with a ±12 to ±15 V supply.
The LV25-P is a LEM closed-loop voltage transducer that measures DC, AC and pulsed voltage with galvanic isolation between the primary and secondary circuits, on a compact printed circuit board module. It is a current-input device: an external primary resistor R1 converts the measured voltage into a nominal 10 mA primary current, so the user selects the voltage range by choosing R1, and the same transducer can measure from about 10 V up to 500 V. The closed-loop Hall principle drives a secondary current that balances the primary ampere-turns, giving high accuracy, low linearity error and low offset drift, and the isolated 25 mA current output is converted to a voltage by a measuring resistor at the controller. This design suits DC-link voltage monitoring in motor drives and inverters, grid and bus voltage measurement in solar and storage converters, and general industrial process measurement where an isolated, accurate voltage signal is required. The ±12 to ±15 V bipolar supply suits conventional analog control boards, and the PCB module is easy to integrate alongside a current transducer on the same board. Every LV25-P BeiLuo ships is a genuine LEM part, factory-traceable and supplied with an import declaration, a certificate of origin and a RoHS compliance file, together with FAE support for resistor sizing and isolation planning. For higher voltage, the DVL and DVC ranges extend measurement to 1000 V and above.
FAE Professional Review
The LV25-P is the most versatile isolated voltage transducer we stock. Its current-input design means one part covers a wide voltage span simply by changing R1, which is ideal for teams that build several voltage variants of one board. Size R1 for power and accuracy, and remember that the nominal 10 mA primary current is what delivers the specified accuracy.
| Parameter | Value |
|---|---|
| Technology | Closed-loop Hall |
| Nominal Voltage | 10 to 500 V |
| Measuring Range | 0 to ±500 V (via R1) |
| Output | 25 mA current |
| Supply | ±12 to ±15 V |
| Mounting | PCB |
Application Circuits
DC-link voltage monitoring in drives
Reference circuits and application schematics for DC-link voltage monitoring in drives are available from our FAE team.
Grid and bus voltage in solar and storage
Reference circuits and application schematics for Grid and bus voltage in solar and storage are available from our FAE team.
Industrial process voltage measurement
Reference circuits and application schematics for Industrial process voltage measurement are available from our FAE team.
Need a reference schematic or design review? Our FAE engineers can share verified circuits and layout guidance for this part.
Related Documents
Alternative Part Numbers
Complementary Part Numbers
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Frequently Asked Questions
How do I choose the primary resistor R1?
Choose R1 so the nominal voltage to be measured produces a primary current of about 10 mA, for example 25 kohm for 250 V. Respect R1 power dissipation and the recommended operating range, because accuracy is best at the nominal current.
Our FAE team can size R1 for your voltage and accuracy target.
What output does the LV25-P provide?
The output is an isolated secondary current of 25 mA at the nominal primary current, converted to a voltage by a measuring resistor at the controller. This current output keeps the signal robust over long wiring runs.
Size the measuring resistor for your ADC input range.
Is the part genuine and documented?
BeiLuo supplies factory-traceable LV25-P parts with an import declaration, certificate of origin and RoHS file on every order. Stock is normally available and the datasheet downloads from this page.
Order a sample to validate the transducer before volume production.