ABB LT2005-S/SP19 Current Transducer

Product Overview

ABB LT2005-S/SP19 is a closed-loop Hall-effect current transducer manufactured by LEM and used as an industrial current-measurement component in ABB power-conversion equipment. Distributor references associate it with ABB part number 3BHB014827R0001.

The device is designed to measure high AC or DC current while providing galvanic isolation between the primary power circuit and the measurement electronics. This makes it suitable for demanding medium-voltage drive and excitation applications.

Core Specifications

The available technical references identify the following characteristics:

• Manufacturer: LEM
• ABB Spare Part: 3BHB014827R0001
• Sensor Type: Closed-loop Hall-effect current transducer
• Measurement: AC and DC current
• Nominal Primary Current: Approximately 2000 A RMS according to supplier documentation
• Isolation: Galvanic isolation between primary and secondary circuits
• Application: High-current industrial power electronics
• Mounting: Panel-mounted design with a large primary aperture
• Typical Systems: ABB medium-voltage drives and excitation equipment

Mouser identifies the LEM device as an industrial current sensor, while ABB-related spare-part references associate it with ACS6000 drives and UNITROL generator excitation systems.

Measurement Technology

The component uses closed-loop Hall-effect technology. The primary conductor passes through the sensor aperture, while the magnetic field produced by the current is detected by the internal sensing system.

A feedback circuit then generates a secondary signal proportional to the measured primary current. This closed-loop arrangement provides accurate current reproduction while maintaining electrical isolation between high-power and low-voltage circuits.

Such isolation is particularly valuable in power converters because measurement electronics must remain protected from the high-energy switching environment.

Design Highlights

Several characteristics make this type of current transducer suitable for heavy-duty industrial equipment:

• High-current measurement capability for large power-conversion systems.
• AC/DC measurement for flexible monitoring applications.
• Galvanic isolation between power and control circuits.
• Closed-loop operation for accurate current feedback.
• Large-aperture construction for high-current conductors.
• Fast electrical response suitable for dynamic drive-control applications.
• Industrial construction intended for demanding electrical cabinets.

Supplier documentation also identifies the component as a current transducer used in ABB ACS6000 systems.

System Applications

This current sensor is associated with high-power ABB equipment rather than ordinary low-current automation I/O. Documented applications include ACS6000 medium-voltage drives and generator excitation systems such as UNITROL installations.

Potential industrial applications include:

• Medium-voltage motor drives
• Generator excitation systems
• Large industrial converters
• Power-generation equipment
• Steel and metal-processing machinery
• Mining equipment
• High-power production lines
• Industrial power-electronics cabinets

In these systems, accurate current feedback supports regulation, monitoring, protection, and system diagnostics.

Installation and Maintenance

Installation should only begin after the associated power equipment has been safely isolated and discharged. High-current and medium-voltage systems can retain dangerous electrical energy even after normal shutdown.

Before replacement, technicians should inspect the primary conductor path, mounting arrangement, terminals, and surrounding wiring. The sensor aperture must accommodate the original conductor arrangement without creating mechanical stress.

During maintenance, check for:

• Loose connections
• Overheating or discoloration
• Mechanical damage
• Contamination
• Damaged insulation
• Abnormal cable positioning
• Signs of electrical arcing

Do not apply mechanical force to the sensing assembly during installation. After replacement, verify the measurement signal and associated protection functions according to the host drive or excitation-system commissioning procedure.

Replacement Considerations

Correct identification is especially important for legacy power-conversion equipment. Several LEM current sensors have similar physical appearances but different electrical characteristics.

For procurement, it is therefore useful to provide the ABB spare-part number, LEM designation, equipment model, and photographs of the existing component. Available documentation connects this device with ABB spare-part number 3BHB014827R0001, which can help distinguish it from other current-transducer variants.

For industrial maintenance projects, our supply service supports ABB drive components, current transducers, control boards, power modules, and other hard-to-find automation spare parts.