LV100-300/SP9 High-Precision Closed-Loop Hall-Effect Voltage Transducer

LV100-300/SP9 Brand: LEM – Global Leader in Electrical Measurement

In industrial automation and power electronics, the accuracy and response speed of voltage acquisition form the cornerstone of closed-loop control, directly determining the dynamic performance and safety margin of your entire system. The LV100-300/SP9 voltage transducer, built by Switzerland’s LEM (pioneer of closed-loop Hall-effect technology), is a high-performance, cost-effective measuring component tailormade for medium and lowvoltage industrial equipment. It is widely used in variable frequency drives, servo drives, UPS systems, and many other applications – trusted by customers worldwide.

LV100-300/SP9 Product Overview

The LV100-300/SP9 is a high-accuracy closed-loop Hall-effect voltage transducer from LEM’s LV100 series, designed for electronic measurement of DC, AC, and pulsed voltages. Using advanced closed-loop Hall-effect compensation technology, it has a primary nominal voltage of 300 V and a maximum measuring range extending to ±450 V – perfectly matching the most common voltage monitoring requirements in industrial medium and lowvoltage systems.

The transducer provides complete electrical isolation between the primary and secondary circuits, with a tested isolation voltage of 6 kV @ 50 Hz for 1 minute. This ensures the safety of downstream measurement circuits and eliminates groundpotential interference and electric shock risks.

This model has proven its reliability over many years and is used in tens of thousands of industrial installations worldwide – from automated production lines on factory floors to UPS systems in data centers, from robotjoint servo drives to precision welding equipment. The LV100-300/SP9 consistently delivers stable, dependable performance for every voltage measurement.

LV100-300/SP9 Key Advantages & Technical Features

✅ 1. IndustryLeading Measurement Accuracy

Using closed-loop Hall-effect compensation technology, the transducer achieves an overall accuracy of ±0.7% and linearity better than 0.1%. It provides consistent, distortionfree signals across the entire rated measuring range, ensuring accurate and reliable results under both wide input voltage swings and complex load variations.

✅ 2. MicrosecondClass Fast Response

Response time is only 80 µs (reaching 90% of the final output). This allows the transducer to capture voltage transients and spikes with exceptional speed, giving your overvoltage protection and dynamic control loops a critical response window. Your equipment can react to unexpected anomalies before they become problems.

✅ 3. Very Low Temperature Drift

Superior manufacturing processes give this model excellent longterm stability. Zero drift is only ±0.2 ~ ±0.3 mA/°C. Combined with a wide operating temperature range of 0°C to +70°C, the longterm stability is outstanding. Whether in hot workshops, sealed cabinets, or outdoor environments, measurement accuracy remains consistently high.

✅ 4. High Noise Immunity & Strong Insulation

The insulating plastic case meets UL 94-V0 (highest flame retardancy rating). The closed-loop compensation architecture provides superior commonmode and electromagnetic interference rejection, ensuring stable and errorfree operation even in “electromagnetic heavy environments” filled with inverters and highpower switching devices.

✅ 5. Integrated Primary Resistor

The primary resistor (R1) is integrated inside the housing, simplifying external circuitry, making PCB layout more compact, and speeding up assembly. The total weight is only 850 grams, enabling highdensity system designs without sacrificing performance.

LV100-300/SP9 Technical Specifications

LV100-300/SP9 Wide Range of Applications

With its ±450 V measuring range, excellent accuracy, and strong noise immunity, the LV100-300/SP9 is ideal for many industrial applications:

✔ AC variable speed drives – Precision monitoring of inverter DCbus voltage for efficient, smooth motor operation and extended equipment life.

✔ Servo motor drive systems – Accurate voltage feedback for servo drives, ensuring precise position and speed control.

✔ Static converters – Reliable voltage measurement in rectification and inversion stages, keeping the DC link stable and controllable.

✔ Uninterruptible power supplies (UPS) – Realtime monitoring of input/output voltage to ensure critical loads receive stable power even during grid disturbances.

✔ Welding equipment power supplies – Accurate voltage detection under highvoltage, hightransient conditions for consistent weld quality.

✔ Industrial robots, automated production lines, railway & mass transit equipment – Meets the strict requirements for environmental robustness and longterm reliability in heavy industry.

Why Buy From LV100-300/SP9?

✅ Genuine product from authorized channels – Sourced directly from LEM or a firsttier authorized distributor. Every unit is brand new and original – no refurbished, bulk, or counterfeit products.

✅ Stock available, fast delivery – Thousands of units in stock. Quick response for both sample testing and volume orders.

✅ Professional technical support – For large customers and special applications, we provide full support from selection guidance to solution implementation.

✅ Peaceofmind aftersales – 7day quality guarantee, 100% functional testing before shipment. All orders are packed in heavyduty antistatic packaging to ensure perfect delivery.