LEM LTC 1000-S/SP1 Closed-Loop Hall Effect Current Transducer

LEM LTC 1000-S/SP1 Product Overview

The LTC 1000-S/SP1 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. The secondary connections support dual fastening modes: either 4×M5 threaded studs or 4×Faston (6.3×0.8mm) tabs . Panel mounting is achieved via 4 slots (Ø5.5mm) with M5 screws.

This model is rated for 1000A nominal current with a measuring range of ±2000A (2× overload capability), outputting a 250mA instantaneous current signal with 0.6% 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), 55.5mm creepage distance, 44mm clearance, and CTI 600 for high-voltage safety in traction environments . It operates over a temperature range of -40°C to +85°C and is compliant with EN 50155 railway standards .

LEM LTC 1000-S/SP1 Key Technical Specifications

LEM LTC 1000-S/SP1 Core Advantages

Closed-Loop Hall Technology with Active Compensation: Delivers 0.6% accuracy and 0.1% linearity across the full measuring range, eliminating core saturation errors found in open-loop sensors .

±2000A Measuring Range with 2× Overload Capability: The 1000A nominal sensor can measure up to ±2000A peak, providing ample safety margin for traction system transients and fault conditions .

13.4kV Ultra-High Insulation Withstand Voltage: Provides 13.4kV RMS insulation test voltage with 55.5mm creepage distance and 44mm clearance, ensuring superior safety 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 .

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 .

Dual Secondary Connection Modes: Supports both M5 threaded studs (recommended torque 2.2Nm) and Faston 6.3×0.8mm tabs for flexible installation options .

High Immunity to External Interference: Built-in shield as standard and closed-loop compensation design provide excellent rejection of external magnetic fields .

Low Temperature Drift: Excellent offset and gain stability over the wide -40°C to +85°C operating range, with offset current drift of ±0.5mA .

UL 94-V0 Flame Retardant Case: Certified safety housing for demanding industrial and railway environments .

Active Part Status with Full Manufacturer Support: Currently in production with 10-week lead time and full LEM support .

LEM LTC 1000-S/SP1 Target Applications

The LTC series is specifically designed for traction applications :

Railway Traction Systems: Traction converters, auxiliary converters

Propulsion and Braking Choppers

Single-phase or three-phase inverters

Battery chargers

AC Variable Speed Drives and Servo Motor Drives

Industrial Automation and Power Supplies

Substations