LA 55-P Current Transducer
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LA 55-P Current Transducer
LA 55-P Current Transducer
The LA 55-P from LEM International is a high-precision, closed-loop current transducer based on Hall-effect technology, engineered to provide reliable and accurate current measurement in industrial and commercial power electronics. Designed with a nominal current rating of 50 A RMS and capable of handling currents up to ±70 A, this device delivers strong performance for DC, AC, and pulsed current sensing with galvanic isolation between primary conductor and secondary circuitry.
Durability is built into its design: the LA 55-P operates reliably across a temperature range of –40 °C to +85 °C, housed in an insulated plastic case rated UL 94-V0 for safety. It features low temperature drift, excellent linearity (< 0.15 %), and metering accuracy around ±0.65 % under standard conditions. Fast response and wide frequency bandwidth make it well suited for demanding environments.
This transducer is especially suitable for applications where safety, precision, and consistency matter: motor drives, variable speed drives, static DC motor converters, UPS systems, welding equipment, battery-powered systems, and switched-mode power supplies. Its lack of insertion loss, high immunity to external interference, and capability to endure overload further enhance its appeal for industrial and commercial settings.
With such traits—efficiency in measurement, robust build, high accuracy, and broad range of applications—the LA 55-P becomes the go-to sensor in designs where both performance and reliability must be guaranteed over long lifetimes.
Key Specs
| Parameter | Specification |
|---|---|
| Manufacturer | LEM International |
| Product Name / Type | LA 55-P Closed-Loop Current Transducer |
| Nominal (Primary) Current (IPN) | 50 A RMS |
| Measuring Range (Primary Current, Peak ±) | ±70 A |
| Supply Voltage (UC) | ±12 V to ±15 V |
| Accuracy at IPN (TA = 25 °C, ±15 V) | ±0.65 % |
| Linearity Error | < 0.15 % |
| Frequency Bandwidth (-1 dB) | DC to 200 kHz |
| Response Time (10-90 %) | ~1 µs (-90 % step) |
| Operating Temperature Range | –40 °C to +85 °C |
| Case / Mounting | PCB mount, through-hole primary conductor, insulated plastic case UL 94-V0 |
| Isolation / Safety | Galvanic isolation primary to secondary; complies with standards EN 50178, UL 508; insulation test ~2.5 kV RMS, impulse withstand ~5.7 kV |
