LF 310-S/SPA1

Current Sensors Overview

The LF 310-S/SPA1 is a closed-loop Hall effect current sensor manufactured by LEM USA Inc. It features a single pass-through design for the electronic measurement of DC, AC, and pulsed currents with galvanic isolation. The module supports a nominal primary current (IPN) of 300 A and a maximum primary current (IPM) of 500 A. It provides a secondary output signal of 150 mA corresponding to the nominal current. The device operates bidirectionally and is designed for industrial applications requiring precise current monitoring.

Current Sensors Feature Summary

• Closed-loop Hall effect technology ensures high precision and fast response times.
• Galvanic isolation separates primary and secondary circuits for safety.
• Single pass-through aperture simplifies installation for busbars or cables.
• Bidirectional operation allows accurate measurement of positive and negative currents.

Current Sensors Applications

• Industrial motor drive systems
• Power supply units and converters
• Battery management systems
• Uninterruptible power supplies (UPS)

Current Sensors Procurement Notes

Verify the specific suffix SPA1 against official LEM documentation to confirm pinout and mounting configuration compatibility. Ensure the required operating temperature range aligns with your system environment. Cross-reference the datasheet sensitivity values with your control circuit input requirements. Confirm that the mechanical dimensions fit the intended panel or DIN rail mounting space. Request certified test reports if strict quality assurance protocols are mandated for the application.

Current Sensors Selection Notes

Select this model when a 300 A nominal current rating with 500 A peak capability is required. The closed-loop architecture is suitable for applications demanding high linearity and low offset drift compared to open-loop sensors. Consider the single pass-through form factor for straightforward integration into existing busbar layouts. Evaluate the 150 mA output signal level against the input impedance of the downstream processing electronics to ensure proper signal transmission without additional amplification.

Current Sensors Part Context

The LF 310 series represents LEM's range of bipolar insulated current transducers. This specific variant utilizes Hall effect principles within a closed-loop configuration to maintain accuracy across varying load conditions. It is part of a broader family of sensors designed for robust industrial environments, offering reliable performance in measuring complex current waveforms including pulses and harmonics.

Current Sensors Replacement Considerations

Consult official LEM substitution guides for direct equivalents. Verify that any alternative component matches the 300 A IPN, 500 A IPM, and 150 mA output specifications. Ensure mechanical footprint and pin assignment compatibility before replacing the unit in existing assemblies.

Current Sensors FAQ

What is the maximum primary current the LF 310-S/SPA1 can handle?

The sensor has a nominal primary current (IPN) of 300 A and a maximum primary current (IPM) of 500 A.

Does this sensor support bidirectional current measurement?

Yes, the LF 310-S/SPA1 is designed for bidirectional measurement, allowing it to detect both positive and negative current flows.

What type of isolation does the LF 310-S/SPA1 provide?

It provides galvanic isolation between the primary conductor and the secondary output circuit, ensuring electrical safety and noise immunity.