LT100-S/SP43 Closed-Loop Hall Effect Current Sensor

LT100-S/SP43 Product Description

As industrial automation and power electronics continue to evolve toward higher frequencies and larger currents, precise, reliable, and safe current monitoring has become a critical aspect of system design. The LT100-S/SP43 is a high-performance current sensor based on closed-loop Hall effect technology, specifically developed for medium to high current applications. It is widely used in industrial variable frequency drives, servo control systems, renewable energy generation, and power monitoring systems. Its core design philosophy is to deliver stable, distortion-free isolated measurements of DC, AC, and pulsed currents even in complex electromagnetic environments and under demanding temperature conditions. More than just a measuring component, it is a key contributor to ensuring safe operation and improving energy efficiency in power systems.

LT100-S/SP43 Key Features

High-Precision Closed-Loop Technology : Utilizes closed-loop (compensated) Hall effect principle, greatly eliminating errors caused by core non-linearity and temperature drift, maintaining high linearity over a wide measurement range.

Ultra-Fast Dynamic Response : Microsecond-level response speed capable of accurately capturing transient peak currents and rapidly changing load waveforms, suitable for high-frequency switching control and protection logic.

Wide Bandwidth Measurement : DC to 150 kHz frequency response seamlessly covers fundamental waves, harmonics, and high-frequency switching ripple in modern power electronics, delivering excellent signal fidelity.

Fully Isolated Primary to Secondary : Electromagnetic isolation between primary and secondary circuits – no electrical contact ensures high withstand voltage, fundamentally protecting downstream sampling circuits and operator safety.

Stable Over Wide Temperature Range : Reliable operation from -40°C to 70°C, whether in frigid outdoor power distribution sites or high-temperature, densely packed equipment cabinets, maintaining excellent consistency and long life.

Through-Hole Design for High Current : Rated 100A detection capability with modular packaging, allowing direct busbar or cable passage – easy installation with very low insertion loss.

LT100-S/SP43 Technical Specifications

Measured Current : 100A nominal, accurately measures DC, AC, and pulsed currents.

Sensor Type : Closed-loop Hall effect.

Accuracy Class : ±0.5%.

Linearity : ±0.1% over full range, maintaining excellent signal fidelity.

Response Time : < 1µs, capable of fast tracking of dynamic current changes.

Frequency Bandwidth : DC to 150 kHz.

Output Signal : Ratiometric output, easily compatible with various controllers and data acquisition cards.

Supply Voltage : Supports wide supply range -12V to 18V, with bidirectional polarization detection capability.

Operating Temperature : -40°C to 85°C (varies slightly depending on environment, up to 85°C grade), adaptable to complex industrial installation conditions.

Insulation Voltage : High isolation rating, ensuring complete electrical separation between primary power and secondary low-voltage circuits.

LT100-S/SP43 Applications

Industrial Drives & Servo Control : Real-time monitoring of inverter input/output currents, enabling closed-loop vector control, and fast response during overload or short circuit to protect power modules.

Switching Power Supplies & Inverters : Used in inverter welders, telecom power supplies, and on-board power supplies for high-frequency current sampling on output loops, working with control ICs for precise constant current or current limiting regulation.

Renewable Energy & Energy Storage : Monitoring charge/discharge currents in photovoltaic inverters, wind turbine converters, and battery storage systems – effectively preventing overcharge or reverse current, improving energy utilization and system safety.

Uninterruptible Power Supplies : Installed at UPS rectifier inputs or inverter outputs for real-time power calculation and fault determination for bypass switching.

Laboratories & Test Measurements : Leveraging wide bandwidth and high linearity, it can be used as a current probe for capturing various power waveforms, ideal for power electronics product development and debugging.

Elevators & Hoisting Equipment : Monitoring hoist motor current with PLCs to achieve overload protection and soft-start control.

Why Choose LT100-S/SP43 This Model

Among the many current sensing solutions available, the LT100-S/SP43 stands out with its precise performance parameters. More importantly, the inherent high accuracy and low drift of closed-loop Hall technology allow it to combine fast response and high isolation – two seemingly conflicting but actually crucial capabilities. It faithfully reproduces high-dynamic current waveforms while ensuring safe and stable system operation. Rather than compromising with limited-accuracy conventional transformers or temperature-sensitive simple Hall elements, choosing an industrial precision sensor like the LT100-S/SP43 is a step forward. For users who value high reliability, safety, and ease of maintenance, this sensor is the ideal choice to guarantee long-term system stability and help projects achieve successful delivery.