LDSR 0.3-TP/SP1 High-Precision Leakage Current Sensor

LDSR 0.3-TP/SP1 Product Overview

The LDSR 0.3-TP/SP1 is a high-precision leakage current sensor from LEM, a world-renowned sensor brand. It is specifically designed for residual current and leakage current measurement in residential and small commercial photovoltaic inverters. Based on closed-loop Hall effect technology, the sensor has a rated current of 0.3 ARMS and accurately measures DC, AC, and pulsed currents while providing galvanic isolation between the primary and secondary circuits, ensuring system safety and reliability.

With low power consumption, compact size, and high overload capability, the LDSR 0.3-TP/SP1 has become a cost-effective solution for leakage protection in PV inverters. Its PCB mounting design makes integration easy and is widely used in renewable energy applications.

LDSR 0.3-TP/SP1 Key Features

High Accuracy Measurement – Rated current 300 mA, measuring range from -900 mA to +900 mA, sensitivity up to 2.2 V/A, bandwidth DC to 2 kHz, ensuring accurate capture of leakage currents.

High Isolation Safety – Creepage distance and clearance of 7.1 mm, overload capability up to 3,300 A (100 ms pulse), combined with 600 V CTI insulation performance, significantly improving system safety margins.

Wide Temperature Stability – Operating temperature range -40°C to +105°C, covering extreme environmental requirements. Closed-loop Hall ASIC technology ensures high accuracy over the full temperature range, fully compliant with EN 61209 standards.

Low Power & Energy Saving – Single 5V DC supply, typical power consumption of only 40 mA, meeting green energy-saving design requirements.

Compact Size Saves Space – Lightweight 25 g device, small footprint and simple structure, ideal for spaceconstrained compact PCB designs.

Special Function Expansion – Features internal reference voltage adjustment, test winding, and degaussing functions, providing flexible onsite debugging capabilities for engineers to optimize system configuration.

LDSR 0.3-TP/SP1 Key Technical Specifications

LDSR 0.3-TP/SP1 Applications

PV Inverter Leakage Current Detection – AC/DC fault current measurement in residential transformerless PV inverters, providing primary shock protection for users.

Power Supply Fault Detection – Symmetrical fault detection and power supply fault detection in mediumpower inverters, ensuring equipment stability.

Residual Current Monitoring – Suitable for threephase plus neutral systems and leakage current monitoring with superimposed DC power supplies.

SinglePhase Rated Current Measurement – Suitable for measuring rated currents up to ±30 A (DC or AC) per phase.

Why Choose LDSR 0.3-TP/SP1

Trusted Brand – LEM is a global leader in the sensor market, specializing in current and voltage sensors widely used in drives, renewable energy, power supplies, automotive electronics, and more. With multiple production plants and sales offices worldwide, LEM delivers proven technology and quality assurance.

High Standards & Approvals – The product has obtained CE and UL certifications, fully compliant with industry standards for peace of mind.

Excellent CostPerformance – Low cost, small PCB footprint, simple structure – an excellent alternative to highercost fluxgate sensors.

FiveYear Warranty – LEM provides a fiveyear quality warranty, worryfree aftersales support.