LT505-T/SP20 | LEM High-Precision Current Transducer – Empowering Every Accurate Measurement in Industrial Energy Management

Closed-loop Hall effect technology · 0.6% accuracy · Designed for advanced drives and new energy systems

As industrial automation advances toward intelligence, accurate current measurement is not only the foundation of any system but also the key to unlocking efficiency breakthroughs. The LT505-T/SP20, a next-generation closed-loop Hall-effect current transducer from LEM, combines high precision, wide measuring range, and strong anti-interference capability to deliver reliable, stable data in demanding industrial environments.

With the rise of Industry 4.0 and edge computing, global demand for high-precision control components is growing rapidly. The LT505-T/SP20 stands out as the preferred core component for servo drives, power supplies, and renewable energy systems, helping manufacturers seize the initiative in smart manufacturing.

LT505-T/SP20 Key Features – Closed-loop Hall technology redefines measurement limits

0.6% accuracy, no delay
Over the full measuring range, the LT505-T/SP20 delivers a typical accuracy of 0.6%, faithfully reproducing signals from zero to peak over a wide frequency band. Even in highly non-linear load environments, it provides accurate, real-time current parameters.

Closed-loop Hall effect – immune to electromagnetic interference
The advanced closed-loop Hall technology actively cancels the primary magnetic field with a compensation field generated by the secondary circuit, eliminating core remanence and temperature drift. Whether dealing with high-frequency harmonics from a VFD or complex EMI from heavy electrical equipment, the LT505-T/SP20 outputs clean, stable signals.

High overload capability – builtin safety margin
The LT505-T/SP20 measures up to ±1200 A – more than double its rated current of 500 A. This extra capacity provides a safety margin exceeding 100% of the nominal rating.

LT505-T/SP20 Key Technical Parameters

LT505-T/SP20 Applications – Precision at the heart of your drive

With excellent electrical isolation and a wide current measurement range, the LT505-T/SP20 is deeply integrated into key nodes of the industrial energy chain:

High-efficiency motor and servo drives
AC motor drives and servo systems demand real-time current feedback. The LT505-T/SP20 acquires and feeds back signals in microseconds, helping controllers precisely adjust torque and speed – significantly improving dynamic response and operational smoothness.

New energy & renewable energy systems
In PV inverters and wind turbine converters, highprecision current monitoring is the hardware foundation for maximum power point tracking (MPPT). With wide dynamic range and low temperature drift, the LT505-T/SP20 maintains accuracy even in harsh outdoor environments with fluctuating sunlight or wind, boosting both generation efficiency and operational stability.

Uninterruptible power supplies (UPS) & switch-mode power supplies (SMPS)
UPS systems for critical data centers or medical equipment require extreme long-term stability and fast response. The LT505-T/SP20 continuously monitors battery charge/discharge status and load changes, providing millisecond fault alerts during power switching or transient events – ensuring clean, stable power for critical loads.

DC motor drives and welding equipment
Static converters and welding power supplies contain many non-sinusoidal and irregular current pulses that openloop sensors struggle with. The LT505-T/SP20 supports insulated measurement of DC, AC, and irregular waveforms, delivering precise closedloop current control for welding equipment – improving weld quality and equipment reliability.

LT505-T/SP20 Brand credibility – LEM (Switzerland), over 40 years of global measurement expertise

The LT505-T/SP20 is built by LEM, a world leader in electrical measurement solutions. Headquartered in Geneva, Switzerland, and with more than 40 years of history, LEM focuses exclusively on current and voltage sensing technology. LEM transducers are widely used in industrial automation, rail transportation, new energy, automotive electronics, and more – renowned globally for high accuracy, high reliability, and robustness. Choosing LEM means choosing decades of technical heritage and continuous innovation.