LEM LTC 1000-SF/SP14 Closed-Loop Hall Effect Current Transducer

LEM LTC 1000-SF/SP14 Product Overview

The LTC 1000-SF/SP14 is a closed-loop Hall effect current transducer from LEM's LTC series, designed for electronic measurement of DC, AC, and pulsed currents with galvanic isolation between the primary and secondary circuits . It is specifically optimized for traction applications including railway propulsion and braking choppers, traction converters, and auxiliary converters .

This model features a 42mm aperture for the primary conductor crossing, providing a larger opening compared to other LTC models . The secondary connections support dual fastening modes: either 4×M5 threaded studs or 4×Faston (6.3×0.8mm) tabs .

The SP14 variant is a special configuration with feet mounted to be compatible with LT 1000-SI/SP11, making it an ideal drop-in replacement for existing installations . The transducer supports horizontal or vertical mounting with or without busbar integration .

This model is rated for 1000A nominal current with a measuring range of ±3000A (3× overload capability), outputting a 250mA instantaneous current signal with 0.4% accuracy and ±0.1% linearity . It operates on a ±15V to ±24V bipolar supply, with a DC~100kHz bandwidth and a 1µs response time .

The sensor features a 13.4kV RMS insulation test voltage (between primary and secondary) and operates over a temperature range of -40°C to +85°C . It is compliant with EN 50155 railway standards and housed in a UL 94-V0 flame-retardant case .

LEM LTC 1000-SF/SP14 Key Technical Specifications

LEM LTC 1000-SF/SP14 Core Advantages

Closed-Loop Hall Technology with Active Compensation: Delivers 0.4% accuracy and ±0.1% linearity across the full measuring range, eliminating core saturation errors found in open-loop sensors .

±3000A Wide Measuring Range with 3× Overload Capability: The 1000A nominal sensor can measure up to ±3000A peak, providing ample safety margin for traction system transients and fault conditions .

13.4kV Ultra-High Insulation Withstand Voltage: Provides exceptional insulation safety with 13.4kV RMS test voltage, ensuring superior protection in demanding railway traction environments .

1µs Fast Response + 100kHz Bandwidth: Captures fast IGBT switching transients and high-frequency current components for protection and control applications .

Drop-in Compatibility with LT 1000-SI/SP11: The SP14 variant features special feet mounted to match the LT 1000-SI/SP11 footprint, making it an ideal replacement for existing installations without mechanical modifications .

Flexible Mounting with Integrated Feet: Supports horizontal or vertical mounting with or without busbar integration. Feet can be mounted in 3 different ways to create vertical mounting options .

Dual Secondary Connection Modes: Supports both M5 threaded studs and Faston 6.3×0.8mm tabs for flexible installation options .

42mm Large Aperture: Provides a larger primary conductor opening compared to other LTC models, accommodating larger busbars and cables .

Traction-Grade Design with EN 50155 Compliance: Designed for railway propulsion converters, braking choppers, and auxiliary converters with -40°C to +85°C operating range .

Active Part Status with Full Manufacturer Support: Currently in production with full LEM support .