LZSR250-P/SP1;LZSR 250-P/SP1

‌LZSR250-P/SP1 High-Performance Closed-Loop Hall Current Sensor — The Precision Core of Industrial Intelligent Monitoring‌

LZSR250-P/SP1 ‌Product Overview‌

The LZSR250-P/SP1 is a next-generation closed-loop Hall effect current sensor developed by LEM SA, engineered for high-dynamic, high-precision current detection in industrial applications. Rated for 250 A DC, it safely measures peak currents up to 380 A, making it ideal for real-time monitoring of DC, AC, and pulsed currents. Featuring a single +5 V power supply architecture and PCB-mountable design, it integrates a through-hole primary conductor for non-intrusive current sampling—eliminating the need to break the main circuit. With a compact footprint (37.75 × 48.4 × 19.4 mm) and industrial-grade reliability, it is the ideal choice for current feedback loops in renewable energy, automation drives, and power electronics systems.

LZSR250-P/SP1 ‌Core Features and Technical Advantages‌

‌Ultra-Low Zero-Point Drift‌: Leveraging LEM’s patented ASIC closed-loop Hall technology, zero-point drift is reduced to just ‌2 ppm/K‌—more than seven times better than conventional Hall sensors—ensuring measurement stability across the full operating range of -40°C to +85°C.

‌High Dynamic Response‌: With a response time of only ‌3 μs‌, it accurately captures rapid current transients, making it perfect for high-frequency switching power supplies, motor start-stop cycles, and inverter switching events.

‌Zero Insertion Loss‌: Non-contact measurement eliminates the heat generation and power loss associated with shunt resistors, improving overall system efficiency and extending equipment lifespan.

‌Electrical Isolation Safety‌: Achieves up to ‌5 kV‌ of galvanic isolation between primary and secondary circuits, effectively suppressing ground loops and safeguarding personnel and control systems.

‌Built-in Overcurrent Protection‌: Integrated overcurrent detection output (threshold: 1.93×IPN) can directly trigger protective circuits, simplifying system design and enhancing reliability.

‌Single-Supply Operation‌: Operates on +5 V DC only—compatible with standard embedded systems and PLC analog input modules—reducing design complexity and cost.

LZSR250-P/SP1 ‌Technical Specifications‌

‌Rated Current‌: 250 A DC

‌Measurement Range‌: 0–380 A (peak, 3× rated)

‌Output Signal‌: 2.5 ± 0.675 V (linear proportional output)

‌Supply Voltage‌: +5 V DC (single supply)

‌Accuracy‌: ±0.83%

‌Response Time‌: <3 μs

‌Frequency Response‌: DC to 200 kHz

‌Isolation Voltage‌: 5 kV AC (primary to secondary)

‌Operating Temperature‌: -40°C to +85°C

‌Mounting‌: PCB mount with through-hole primary conductor (compatible with standard busbars)

‌Output Type‌: Analog voltage output, compatible with data acquisition cards, MCUs, and PLC analog inputs

‌Protection Rating‌: Designed for standard industrial control cabinet environments; no external housing required

LZSR250-P/SP1 ‌Market Positioning and Competitive Advantages‌

The LZSR250-P/SP1 targets the high-end current sensing segment in industrial automation and renewable energy markets, directly competing with open-loop Hall sensors, shunt resistors, and traditional current transformers. Compared to open-loop alternatives, its closed-loop architecture delivers superior linearity and thermal stability; versus shunt resistors, it offers zero power loss, no heat generation, and no grounding risks; and unlike conventional transformers, it supports DC response and a much wider bandwidth. In rapidly growing sectors such as photovoltaic inverters, electric vehicle drives, and energy storage systems, customers are shifting from “good enough” to “precise, stable, maintenance-free.” Backed by LEM’s 50 years of global leadership in sensing technology, the LZSR250-P/SP1 has become the preferred core component for system integrators building high-reliability power electronics platforms.

LZSR250-P/SP1 ‌Typical Applications‌

‌Photovoltaic Inverters‌: Precisely monitors DC string currents to optimize MPPT performance and enable early fault detection, boosting system energy yield by over 3%.

‌Electric Vehicle Drive Systems‌: Delivers high-fidelity current feedback for motor controllers, ensuring precise torque control and rapid overload protection.

‌Energy Storage Converters (PCS)‌: Enables accurate measurement of battery charge/discharge currents to support BMS safety protocols and energy scheduling algorithms.

‌High-Frequency Industrial Welding Equipment‌: Stably captures pulsed welding current waveforms, reducing spatter, improving weld quality, and extending electrode life.

‌General Variable Frequency Drives and Servo Systems‌: Enhances dynamic current control for improved response speed and positioning accuracy in robotics and automated production lines.

‌Power Electronics Laboratories‌: Serves as a reference sensor for power module development, EMC testing, and system validation.

‌Why Choose the LZSR250-P/SP1?‌

‌Exceptional Precision and Stability‌: 2 ppm/K drift ensures long-term accuracy without calibration—even in the extreme seasonal temperature variations of Jining, Shandong.

‌Plug-and-Play Design‌: Standard 5 V output requires no signal conditioning circuitry, accelerating product development cycles.

‌Industrial Reliability‌: Fully operational from -40°C to +85°C, built to endure harsh environments from northern winters to southern summers.

‌Safety-First Engineering‌: 5 kV isolation + integrated overcurrent protection meet IEC 61800 and other global industrial safety standards.

‌Trusted Global Brand‌: Designed by LEM SA—certified to ISO 9001, RoHS, and REACH—with comprehensive technical support and warranty services.

‌Green and Efficient‌: Ultra-low quiescent power consumption supports corporate carbon neutrality goals and aligns with China’s “Dual Carbon” policy.