LTC1000-S/SP5 | LEM High-Precision Closed-Loop Hall-Effect Current Transducer

LTC1000-S/SP5 Product Overview: The Reliable Choice for High-Current Precision Measurement

In industrial automation, new energy vehicles, and renewable energy systems, accurate high-current measurement directly impacts system safety and operational efficiency. The LEM LTC1000-S/SP5 current transducer is a professional-grade solution designed precisely for such demanding applications.

The LTC1000-S/SP5 is a flagship model of LEM’s LTC series. It uses advanced closed-loop Hall-effect technology and is specifically designed for electronic measurement of DC, AC, and pulsed currents, while maintaining complete galvanic isolation between the primary high-voltage circuit and the secondary electronic circuit – ensuring safe system operation. With a rated measurement current of 1000 A and a peak measurement range up to ±2400 A, it easily handles industrial and automotive high-current scenarios.

Key Advantages: Why Choose the LTC1000-S/SP5?

High Precision for System Safety and Efficiency

The LTC1000-S/SP5 offers an accuracy of ±0.4 % of Ipn, far exceeding traditional current sensing solutions. This high precision not only guarantees accurate current detection but also enhances the system’s ability to recognize abnormal currents, helping to detect and address over-charge, over-discharge, and other fault conditions in time – effectively extending equipment lifespan. As industry experts confirm, precise current monitoring is a cornerstone of optimised energy management in battery management systems (BMS) and traction systems.

Microsecond Response Time for Real-Time Control

Based on the same closed-loop Hall-effect architecture as the LTC series, the LTC1000-S/SP5 delivers a response time of just 1 microsecond (1 µs). Such fast dynamic response enables it to capture subtle current changes instantly, making it particularly suitable for applications that require rapid adjustments – such as railway traction systems, renewable energy inverters, and electric vehicle drive controls – ensuring smooth and stable power output under all operating conditions.

Wide Adaptation for Harsh Environments

The LTC1000-S/SP5 operates reliably over a temperature range of -40°C to +85°C. Whether in cold northern winters or hot, humid industrial sites, it maintains consistent measurement performance. The transducer features extremely low temperature drift and strong electromagnetic interference immunity, ensuring stable and dependable data output even in complex working conditions. Its frequency bandwidth covers DC to 100 kHz, allowing accurate current capture in the presence of harmonics and transients. All LTC models come with a standard shielding layer for enhanced external interference rejection.

Superior Safety: High Isolation Test Voltage

Safety is a non-negotiable priority. The LTC1000-S/SP5 is housed in a robust insulating plastic casing that complies with the stringent UL 94-V0 flammability rating, guaranteeing personnel and equipment safety in high-voltage environments. Its isolation test voltage is rated at 13.4 kV (RMS / 50 Hz / 1 min), providing strong galvanic isolation for stable system operation. Excellent temperature stability (typical ≤ 0.01% of IPN / °C) together with ±0.1% linearity ensures highly consistent output signals throughout the entire measurement range.

Modular Design for Flexible Installation

Ease of installation is a key consideration for engineers. The LTC1000-S/SP5 supports both horizontal and vertical mounting. The primary conductor can be fixed in two ways according to customer preference, and the foot can be installed in three different configurations – maximising adaptability to various cabinet layouts and wiring arrangements. The aperture for the main conductor measures 42 x 12 mm (also accepts a 42 mm diameter), allowing even thick busbars to pass through easily.

The secondary connection offers two locking options: 4xM5 threaded studs or 4xFaston (6.3 x 0.8 mm). Customers can choose the connection method that best suits their needs, providing crimping or soldering flexibility for high-current applications while maintaining convenience for later maintenance.

Reliable Power Supply Design

The LTC1000-S/SP5 operates from ±15 V to ±24 V DC dual-rail supply, compatible with most industrial power systems. Its secondary output is an instantaneous 200 mA current signal, easily matched with control circuits or used for AD conversion, minimising signal loss.

LTC1000-S/SP5 Applications: Precision Current Monitoring Across Multiple Fields Railway Traction Systems

The LTC series is specifically designed for traction and railway applications. Its ruggedness and reliability fully meet the demanding requirements of railway operation – whether in single-phase or three-phase inverters, propulsion and braking choppers, auxiliary converters, or battery chargers. The LTC1000-S/SP5 can serve as the core sensing element for system control and protection.

New Energy Vehicles & Battery Management Systems (BMS)

With the rapid growth of new energy vehicles, BMS performance directly impacts vehicle safety and range. The high precision of the LTC1000-S/SP5 is essential for optimising energy management. By accurately monitoring battery charge/discharge current, the BMS can more precisely calculate state of charge (SOC) and state of health (SOH), leading to more reliable range estimates and a smoother driving experience.

Renewable Energy & Industrial Automation

In solar photovoltaic inverters, engineers need precise DC-bus current monitoring to maximise maximum power point tracking (MPPT) efficiency. Studies show that using highaccuracy current sensors can significantly improve overall system efficiency. In industrial variable frequency drives, the LTC1000-S/SP5 continuously monitors motor operating status, ensuring stable operation and timely fault detection.

Power Monitoring & Energy Storage Systems

The LTC1000-S/SP5 is also widely used in energy storage BMS, energy storage PCS, photovoltaic inverters, UPS, charging piles, industrial power supplies, and battery testing – making it the premier choice for high-reliability, high-power current sensing.

LTC1000-S/SP5 Product Specifications At a Glance

Why Choose the LTC1000-S/SP5?

When your system requires monitoring of high currents up to 1000 A – with stringent demands on measurement accuracy, response speed, and operational reliability – the LTC1000-S/SP5 is an unrivalled choice. It represents not just a sensor, but the culmination of LEM’s decades of expertise in electrical measurement.

LEM current transducers are widely used in drives & welding, renewable energy, power supplies, traction, high-precision equipment, traditional and new energy vehicles. Their core products are already deployed across the world’s industrial and transport backbones. Choosing the LTC1000-S/SP5 means selecting a reliable, accurate, and durable partner for your projects.