LA 55-P/SP50

Current Sensors Overview

The LEM LA 55-P/SP50 is a PCB-mountable, closed-loop Hall effect current transducer designed for the electronic measurement of DC, AC, and pulsed currents. It provides galvanic isolation between the primary high-power circuit and the secondary electronic circuit. The device features a rated primary nominal current (IPN) of 50 A RMS. It utilizes a through-hole mounting configuration with an insulated plastic case recognized according to UL 94-V0 standards. The sensor offers excellent accuracy, very good linearity, low temperature drift, and optimized response time with a wide frequency bandwidth.

Current Sensors Feature Summary

• Closed-loop compensated current transducer utilizing Hall effect technology
• Galvanic isolation between primary power and secondary electronic circuits
• PCB through-hole mounting with UL 94-V0 recognized insulated plastic housing

Current Sensors Applications

• AC variable speed drives and servo motor drives
• Static converters for DC motor drives
• Uninterruptible Power Supplies (UPS)
• Switched Mode Power Supplies (SMPS)

Current Sensors Procurement Notes

Verify that the specific part number matches the required IPN rating of 50 A RMS. Confirm the package suffix corresponds to the standard PCB mount variant. Ensure the supplier provides documentation confirming UL 94-V0 recognition for the housing material. Cross-reference the manufacturing date code to ensure component availability aligns with production schedules. Validate that the supply chain source is authorized to prevent counterfeit components.

Current Sensors Selection Notes

Select this model when precise measurement of bidirectional currents up to 50 A RMS is required in space-constrained PCB designs. The closed-loop architecture ensures high linearity and low temperature drift compared to open-loop alternatives. Consider the through-hole mounting requirement during layout planning. This transducer is suitable for applications demanding high immunity to external interference and no insertion losses in the primary circuit path.

Current Sensors Part Context

The LA 55-P belongs to LEM's series of closed-loop Hall effect current transducers. These devices are engineered for high-performance industrial applications requiring reliable galvanic isolation. The LA 55-P variant specifically targets medium-current applications where compact PCB integration is necessary. It complements larger through-hole sensors by offering a balance between current capacity and board-space efficiency.

Current Sensors Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing control loop dynamics if substituting with other LEM models such as the LA 25-P or LA 100-P based on current rating requirements.