HX 15-NP , HX15-NP

LEM HX 15-NP HX Series Open Loop Hall Effect Current Transducer

LEM HX 15-NP Product Overview

The HX 15-NP is an open-loop Hall effect current transducer from LEM's HX Series, designed for the electronic measurement of DC, AC, and pulsed currents with galvanic isolation between the primary and secondary circuits . This compact PCB-mount transducer features a multi-range design via PCB pattern layout, allowing the nominal current to be set to 15 A or 30 A depending on primary connections . It is part of a family covering nominal currents from 5 A to 50 A, with a single design that simplifies inventory management.

Rated for selectable nominal currents of 15 A or 30 A with a measuring range of ±45 A (3 × IPN) , it outputs an analog voltage of ±4 V with ±1% accuracy and ±0.1% linearity . Response time is 3 µs and frequency bandwidth is DC to 50 kHz . Supply voltage is ±15 V (±5%) with current consumption of 15 mA . Mass is 8 g and operating temperature ranges from -25°C to +85°C . Insulation test voltage is 3000 V RMS at 50 Hz for 1 minute, with ≥5.5 mm creepage and clearance distances . The primary conductor diameter is 1.2 mm, and the device requires 2 turns for the 15 A configuration and 1 turn for the 30 A configuration. The insulating plastic case is recognized according to UL 94-V0 . Electrical offset voltage at 25°C is <±40 mV, with thermal drift of ±1.5 mV/K.

LEM HX 15-NP Key Specifications

LEM HX 15-NP Key Advantages

The HX 15-NP employs open-loop Hall effect technology, delivering ±1% accuracy and ±0.1% linearity while providing galvanic isolation with a 3000 V insulation test voltage and ≥5.5 mm creepage and clearance . The ±45 A measuring range accommodates overloads up to three times the nominal current. The 50 kHz bandwidth and 3 µs response time capture dynamic current signals in motor drive and power conversion applications .

The multi-range NP design allows a single transducer to cover 15 A or 30 A nominal currents by changing primary turn connections (2 turns for 15 A, 1 turn for 30 A) . This provides application flexibility and simplifies inventory management. The compact PCB-mount design requires only 2.93 cm² of board space and weighs 8 g, offering low power consumption (15 mA), high immunity to external interference, and no insertion losses . The product is now obsolete and not recommended for new designs .

LEM HX 15-NP 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
Electrical appliances

Why Choose the LEM HX 15-NP?

The HX 15-NP combines selectable 15 A/30 A current ratings and ±45 A measuring range with ±4 V analog voltage output in a compact PCB-mount package. Manufactured by LEM, it delivers stable, accurate, and safe current measurement for industrial applications. The open-loop Hall effect design offers a cost-effective solution with excellent external interference immunity, low power consumption, and a small footprint. The NP multi-range design provides flexibility and simplifies inventory. Compliance with EN 50178 and IEC 61010-1 standards and UL 94-V0 flame rating ensures reliable and safe operation in demanding industrial environments.