📝 Description

Used product.
Original LEM LF 505-S current transducer, designed to measure alternating, direct and pulsed currents, with galvanic isolation between the primary power circuit and the secondary electronic circuit.
The device uses closed-loop Hall effect technology, allowing current measurement without directly inserting the sensor in series with the power circuit. The conductor being measured passes through the central opening of the transducer.
It is designed for industrial and power electronics applications, including inverters, static converters, electric drives and power supplies.
The LEM, LF 505-S and 711160 markings are visible on the housing.

⚙️ Main Specifications

• Brand: LEM
• Model: LF 505-S
• Visible code: 711160
• Type: Hall effect current transducer
• Technology: Closed-loop compensation
• Rated primary current: 500 A RMS
• Measurement range: 0 to ±800 A
• Nominal secondary signal: 100 mA
• Conversion ratio: 1:5000
• Power supply: ±15–24 V DC
• Specified accuracy: ±0.6% at rated current and 25°C
• Linearity error: Less than 0.1%
• Bandwidth: DC–100 kHz
• Response time: Less than 1 µs, under the conditions specified by the manufacturer
• Operating temperature: −40°C to +70°C
• Nominal weight according to the datasheet: Approximately 230 g

🔌 Main Functions

• Measures alternating, direct and pulsed currents.
• Detects current using the Hall effect.
• Provides galvanic isolation between the power circuit and the measurement electronics.
• Supplies a secondary signal proportional to the primary current.
• Supports monitoring and control of electrical power conversion systems.

🛠️ Applications

According to LEM's official documentation, this model can be used in applications such as:

• Single-phase and three-phase inverters.
• Static converters and motor drives.
• Switching power supplies.
• Uninterruptible power supplies (UPS).
• Industrial power conversion and supply systems.
• Battery chargers and other power electronic equipment.

🧩 Installation and Compatibility

The transducer is designed for panel mounting, with the primary conductor passing through the central opening.
When replacing an existing unit, verify:

• Exact sensor model and version.
• Power supply requirements of the circuit.
• Rated current and measurement range.
• Secondary connection type and required measuring resistor.
• Dimensions and mounting point arrangement.
  Compatibility with a specific inverter or machine cannot be guaranteed without checking its model and electrical schematic.

💡 Advantages

• AC and DC current measurement with galvanic isolation.
• Good accuracy and linearity.
• Fast response to current variations.
• Wide bandwidth.
• No need to interrupt the primary conductor to insert the sensor in series.

🛡️ Product Condition

Used product with normal surface marks consistent with use and handling, as shown in the photographs.
Electrical functionality has not been confirmed through instrument testing. Testing the device before installation in an operational application is recommended.

📦 Package Contents

• 1 LEM LF 505-S current transducer.
  Cables, power supplies and other accessories not visible in the photographs are not included.

🟢 Summary

LEM LF 505-S 500 A RMS current transducer, featuring closed-loop Hall effect technology and galvanic isolation. Replacement component for compatible industrial systems, inverters and power converters. Selection must be based on the electrical and mechanical requirements of the application.