LEM HTA 250-S/SP3 HTA Series Open Loop Hall Effect Current Transducer
LEM HTA 250-S/SP3 Product Overview
The HTA 250-S/SP3 is an open-loop Hall effect current transducer from LEM's HTA Series, designed for the electronic measurement of DC, AC, and pulsed currents with galvanic isolation between the primary and secondary circuits . This panel-mount transducer features a 32 mm diameter aperture for non-intrusive installation and a 2 m screened output cable as a special feature .
Rated for 250 A nominal with a measuring range of ±250 A, it outputs an analog voltage of ±10 V with ±1% accuracy and ±0.5% linearity . Response time is <3 µs and frequency bandwidth is DC to 25 kHz . Supply voltage range is ±15 V (±10%) with a current consumption of <25 mA . Mass is 300 g and operating temperature ranges from -25°C to +70°C . Insulation test voltage is 4.0 kV RMS at 50 Hz for 1 minute, with 7.2 mm creepage and clearance distances . The insulating plastic case is recognized according to UL 94-V0 .
LEM HTA 250-S/SP3 Key Specifications
|
Parameter |
Value |
|
Rated current (IPN) |
250 A |
|
Measuring range (IPM) |
±250 A |
|
Output signal |
±10 V (instantaneous voltage) |
|
Supply voltage (VC) |
±15 V (±10%) |
|
Accuracy (X) |
±1 % |
|
Linearity (εL) |
±0.5 % |
|
Response time (tr) |
<3 µs |
|
Bandwidth (BW) |
DC to 25 kHz |
|
Insulation test voltage (Vd) |
4.0 kV RMS / 50 Hz / 1 min |
|
Creepage/Clearance (dCp/dCl) |
7.2 / 7.2 mm |
|
Aperture |
32 mm diameter |
|
Operating temp (TA) |
-25°C to +70°C |
|
Mass (m) |
300 g |
|
Mounting |
Panel (horizontal or vertical) |
|
Secondary connection |
4-core screened cable, 2 m |
|
Technology |
Open-loop Hall effect |
|
Standards |
EN 50178:1997 |
LEM HTA 250-S/SP3 Key Advantages
The HTA 250-S/SP3 employs open-loop Hall effect technology, delivering ±1% accuracy and ±0.5% linearity while providing galvanic isolation with 4.0 kV insulation voltage . The 32 mm aperture enables non-intrusive installation without disconnecting existing cables, and the 2 m screened cable simplifies wiring in panel-mount applications .
The design offers very good linearity, low temperature drift (TCVout ±0.05%/K), high immunity to external interference, very low insertion losses, and current overload capability . Panel mounting supports both horizontal and vertical positions with M4 screws (recommended torque 0.75 N·m) .
LEM HTA 250-S/SP3 Typical Applications
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
Renewable energy systems
Industrial power conversion equipment
Why Choose the LEM HTA 250-S/SP3?
The HTA 250-S/SP3 combines a 250 A rated current with ±10 V voltage output in a robust panel-mount package with a 32 mm aperture and 2 m screened cable. Manufactured by LEM, it delivers stable, accurate, and safe current measurement for industrial applications. Compliance with EN 50178:1997 and UL 94-V0 ensures reliable operation in demanding environments . The 5-year LEM warranty provides long-term reliability assurance.
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