LV 25-P/SP5 , LV25-P/SP5

LV25-P/SP5 High-Precision Closed-Loop Hall-Effect Voltage Transducer

LV25-P/SP5 Product Overview & Core Positioning

The LV25-P/SP5 is a closed-loop Hall-effect voltage transducer from LEM, the world leader in electrical measurement. Designed for demanding medium- and low-power power electronics systems, it measures DC, AC, and pulsed voltages in real time with exceptional precision. Thanks to its advanced magnetic balance technology, it creates a true “safety fortress” between the high-voltage primary side and the low-voltage secondary side.

With ±0.8% high accuracy, a -40°C to +85°C industrial wide temperature range, and 4.2kVrms excellent galvanic isolation, this transducer has become an indispensable measurement and control component in industrial automation, renewable energy, and high-end power supplies.

Why Choose LV25-P/SP5?

1. Excellent Accuracy & Very Low Temperature Drift

The transducer uses an advanced closed-loop Hall compensation technology that delivers extremely precise measurements. Total error is within ±0.8%, and linearity error is below 0.2%. Whether in the bitter cold of winter outdoor inspection or the high heat of a factory control cabinet, its low temperature drift ensures stable operation without extra temperature compensation circuits – keeping your equipment running reliably year after year.

2. Fast Response – Capture Transient Signals in Time

In power electronics, response speed is critical for system protection. The LV25-P/SP5 offers a fast dynamic response with a delay time of just 25 microseconds (25μs). It quickly detects instantaneous faults such as overloads and short circuits, giving your control system precious time to take protective action.

3. True Bidirectional Current Monitoring

Supports ±14mA primary current measurement range for true bidirectional current detection. This means it can monitor not only forward motor drive power but also charge/discharge currents in battery management systems – without needing complex signal-switching circuits.

4. Robust Isolation for Core Safety

The device features a UL 94-V0 flame-retardant enclosure and dual safety design, with an isolation test voltage of 4.2kVrms, fully compliant with IEC 61010 industrial safety standards. It effectively blocks several thousand volts of high voltage from reaching low-voltage control circuits, protecting your PLC, DSP, or MCU from fatal damage.

5. Compact & Easy-to-Use PCB Plug-in Package

The standard through-hole package is compact, perfect for high-density PCB layouts, and requires no complex fixtures. The transducer is factory-calibrated and truly maintenance-free, significantly reducing your designin effort and long-term operating costs.

LV25-P/SP5 Key Applications

With its wide voltage measurement range (measuring 10V to 1500V using external resistors) and strong anti-interference capability, the LV25-P/SP5 is widely used in:

Industrial Automation – servo drives, inverters, elevator control systems. Helped a lift manufacturer reduce inverter failure rates by 37%, saving over ￥150,000 in annual maintenance costs.

Renewable Energy – photovoltaic inverters, wind power converters, EV battery management systems (BMS). In a 20MW solar farm, replacing older transducers with the LV25-P/SP5 improved monitoring accuracy to ±0.5%, recovering ￥86,000 in lost energy revenue over six months.

Power Supplies – high-frequency switching power supplies, UPS systems, inverter welders, EV chargers.

Railway & Traction – locomotive traction converters, railway power supplies.

LV25-P/SP5 Technical Specifications