LT505-S/SP24 Closed-Loop Hall Effect Current Transducer

LT505-S/SP24 Product Overview

The LT505-S/SP24 is a closed-loop Hall effect current transducer from LEM (Switzerland). With a rated current of 500 A, it is a highly accurate and cost-effective model in the LT series family. Based on closed-loop compensation technology, this transducer is designed for demanding industrial and railway traction environments that require precise current monitoring. It delivers excellent performance in measuring DC, AC, and pulsed currents.

Whether you are developing AC variable frequency servo drives, DC motor control systems, uninterruptible power supplies (UPS), or switch-mode power supplies (SMPS), the LT505-S/SP24 provides a reliable and stable current measurement solution.

Key Advantages – Why Choose the LT505-S/SP24?

Excellent Accuracy You Can Trust

Based on closed-loop Hall effect compensation technology, it achieves ±0.6% accuracy over the full measurement range, with ±0.1% linearity. Every measurement is precise and reliable, ensuring that your system control and fault diagnosis are based on trustworthy current data.

Fast Response – Capture Transient Currents

Response time is as low as 1 microsecond, with a frequency bandwidth from DC to 150 kHz. For systems requiring fast overcurrent protection and precise current control, the LT505-S/SP24 captures current transients instantly, safeguarding your system's operation.

Wide Temperature Range – Reliable in Harsh Environments

Operating temperature range: -10 ℃ to +85 ℃. Whether in extreme cold or heat, performance remains stable. Low temperature drift effectively suppresses zero-point offset, maintaining excellent measurement stability under severe temperature conditions.

Strong Immunity to Electromagnetic Interference

The closed-loop architecture naturally provides high immunity to external magnetic fields. In high-EMI environments such as railway traction inverters, the transducer delivers stable output signals, ensuring system control is not compromised.

LT505-S/SP24 Technical Specifications

LT505-S/SP24Typical Applications

 Industrial Automation

AC variable frequency drives and servo motor drives

Static converters for DC motor drives

Industrial robots, pumps and fan control/monitoring

PV inverters (MPPT) and solar combiner boxes

Railway & Traction

Railway traction inverters and drive converters

Auxiliary converters and braking choppers

High-speed train and metro onboard systems

Power Supplies & Power Electronics

Battery-powered equipment

Uninterruptible power supplies (UPS)

Switch-mode power supplies (SMPS)

Welding equipment power supplies

Renewable Energy & Green Technologies

Solar and wind power generation equipment

Electric vehicle charging stations

Smart grid control systems

LT505-S/SP24 Reliability Design

The LT505-S/SP24 embodies LEM’s consistent commitment to quality. Every production step undergoes multiple adjustments and calibrations. The transducer carries CE marking and meets EN 50178 industrial standards. The case is made of UL 94-V0 flame-retardant insulating material, suitable for high-power applications while ensuring safe electrical isolation between the primary circuit and the secondary control circuit.

In practical engineering applications, the LT505-S series achieves a common-mode rejection ratio of up to 85 dB @ 50 kHz in high-frequency PWM interference environments. The Faraday cage structure formed by the shielded housing and magnetic core effectively blocks external magnetic field coupling, guaranteeing stable and reliable signals.

Many industry-leading companies in China have chosen the LT505-S series for applications in high-end equipment manufacturing, railway transportation, renewable energy generation, and industrial automation – a mature solution proven in the market.

LT505-S/SP24 Mechanical Characteristics & Installation

Primary aperture: 40.5 × 40.5 mm – suitable for busbars or primary conductors passing directly through.

Mounting: Panel mount – 4 × Φ6.5 mm fixing holes.

Secondary connection: Faston 6.3 × 0.8 mm terminals for quick wiring.

Compact design saves internal space in your equipment.