LT 2005-S/SP3 , LT2005-S/SP3

LEM LT 2005-S/SP3 LT2005 Series Closed Loop Current Transducer

LEM LT 2005-S/SP3 Product Overview

The LT 2005-S/SP3 is a closed-loop Hall effect current transducer from LEM's LT2005 Series, designed for the electronic measurement of DC, AC, and pulsed currents with galvanic isolation between the primary circuit and the secondary circuit. This panel-mount transducer features a 60.5 x 20.5 mm or 56 mm diameter aperture for primary conductor crossing and includes a shield between primary and secondary for enhanced immunity .

The SP3 variant is configured for 1100 A nominal with a measuring range of ±2000 A. It outputs a secondary current of 220 mA at nominal with ±0.6% accuracy and <0.1% linearity. The conversion ratio is 1:5000 . Response time is <1 µs with a di/dt accurately followed >50 A/µs, and frequency bandwidth is DC to 100 kHz . Supply voltage is ±15 V (±5%) . The measuring resistance (RM) must be selected carefully: with ±15 V supply, RM can be up to 35 Ω at ±1100 A max, or up to 8 Ω at ±2000 A max . Mass is 1.7 kg and operating temperature ranges from -30°C to +70°C . Insulation test voltage is not specified in the documentation found, but the series typically features high isolation. The device meets EN 50155:1995 railway standards .

LEM LT 2005-S/SP3 Key Specifications

LEM LT 2005-S/SP3 Key Advantages

The LT 2005-S/SP3 employs closed-loop Hall effect technology with an insulating plastic case recognized according to UL 94-V0, delivering excellent accuracy and very good linearity while providing galvanic isolation between primary and secondary circuits . The shield between primary and secondary and the Hall element located at the bottom center of the transducer core provide enhanced immunity to external interference . The ±2000 A measuring range accommodates significant overload conditions, while the <1 µs response time and 100 kHz bandwidth capture dynamic current signals in traction applications . The wide -30°C to +70°C operating temperature range ensures reliable performance in railway environments. The design offers low temperature drift, no insertion losses, and current overload capability . Secondary connections are made via M5 threaded studs with locking nuts for secure and reliable wiring.

LEM LT 2005-S/SP3 Typical Applications

Single or three phase inverters for railway traction
Propulsion and braking choppers
Propulsion converters for trains and locomotives
Auxiliary converters for onboard power supply
Battery chargers for railway rolling stock
Railway fixed installations and trackside equipment
Overcurrent protection and fault detection in traction systems

Why Choose the LEM LT 2005-S/SP3?

The LT 2005-S/SP3 combines a 1100 A rated current and ±2000 A measuring range with a 220 mA closed-loop current output in a robust panel-mount package with a large aperture. Manufactured by LEM, it delivers stable, accurate, and safe current measurement specifically for railway traction applications. The closed-loop Hall effect design provides exceptional accuracy and linearity with low temperature drift, while the shield and optimized core configuration ensure reliable performance in demanding electromagnetic environments. Compliance with EN 50155:1995 railway standards ensures reliable operation in rolling stock and traction systems, making it an ideal choice for propulsion, braking, and auxiliary converter applications .