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Closed loop (compensated) current transducer using the Hall effect
| Primary Current, Measuring Range | 0 ... ±200 A |
| Secondary Nominal Current | 125 mA |
| Supply Voltage | ±12 ... 15 V |
| Operating Temperature Range | ‒40 ... +85 °C |
| Isolation Test Voltage | 5 kV |
| Primary Nominal RMS Current (IPN) | 125 A |
AC variable speed drives and servo motor drives, Static converters for DC motor drives, Battery supplied applications, Uninterruptible Power Supplies (UPS), Switched Mode Power Supplies (SMPS), Power supplies for welding applications. Application Domain, Industrial.
The LAH 125-P is a closed loop (compensated) current transducer from LEM for the electronic measurement of currents: DC, AC, pulsed..., with galvanic isolation.
It offers excellent accuracy, very good linearity, low temperature drift and wide frequency bandwidth. Typical applications include AC variable speed drives and servo motor drives, Static converters for DC motor drives, Battery supplied applications and Uninterruptible Power Supplies (UPS).
Key characteristics from the official datasheet: total error ±0.41 %; linearity error < 0.15 %; frequency bandwidth @ I DC ... 100 kHz; operating temperature ‒40 ... +85 °C; nominal secondary output 125 mA.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | LAH |
| Product Reference | LAH 125-P |
| Primary Nominal Current | 125 A |
| Supply Voltage | ±12 ... 15 V |
| Measurement | currents: DC, AC, pulsed... |
| Mounting | PCB Mount |
| Application Domain | Industrial |
| Electrical Data — LAH 125-P | |
|---|---|
| Primary Nominal RMS Current (IPN) | 125 A |
| Primary Current, Measuring Range (IPM) | 0 ... ±200 A |
| Secondary Nominal RMS Current (ISN) | 125 mA |
| Turns Ratio (NP/NS) | 1 : 1000 |
| Supply Voltage (UC) | ±12 ... 15 V |
| Current Consumption (IC) | 19 (@ ±15 V) + I mA |
| Accuracy & Dynamic Performance | |
|---|---|
| Total Error (εtot) @ IPN | ±0.41 % |
| Linearity Error (εL) | < 0.15 % |
| Frequency Bandwidth (BW) | @ I DC ... 100 kHz |
| Insulation Coordination | |
|---|---|
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 5 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | 12 kV |
| Comparative Tracking Index (CTI) | 175 |
| Rated Insulation Voltage (basic) | 1250 V · 1000 V |
| Rated Insulation Voltage (reinforced) | 630 V · 600 V |
| Overvoltage Category / Pollution Degree | Over voltage category OV · Pollution degree PD2 |
| Environmental & Mechanical Characteristics | |
|---|---|
| Ambient Operating Temperature (TA) | ‒40 ... +85 °C |
| Ambient Storage Temperature (TA st) | ‒40 ... +90 °C |
| Mass (m) | 30 g |
| Standards & Certifications | |
|---|---|
| EN 50178 | Compliance |
Note: Specifications are taken from the official LAH 125-P datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the LAH 125-P.
Outline dimensions, pin layout and connection diagrams of the LAH 125-P are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| Mass | 30 g |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the LAH 125-P.
Characteristic curve diagrams are not included in the LAH 125-P datasheet; the relevant characteristics are the accuracy and dynamic performance data listed below.
| Accuracy & Dynamic Characteristics | |
|---|---|
| Total Error (εtot) @ IPN | ±0.41 % |
| Linearity Error (εL) | < 0.15 % |
| Frequency Bandwidth (BW) | @ I DC ... 100 kHz |
Note: For the full set of performance data, refer to the datasheet.
Other models of the LAH Series share the same measurement principle, mounting concept and output interface family.
