LEM, a global leader in sensor solutions, has unveiled the LF 205, 305, 505, 1005, and 2005 current sensor family meticulously designed to cater to industrial and railway applications. These sensors are optimized for precisely measuring DC, AC, and pulsed currents while ensuring galvanic isolation between the primary and secondary circuits.

The LF electronic parts feature a compact design and are characterized by their exceptional precision and rapid response times. While LF 205, 305, 505, 1005, and 2005 can all be panel-mounted in various configurations, LF 205 offers the additional option of PCB mounting, allowing for flexibility in integration.

These five product series feature different aperture diameters for the primary conductor crossing. LF 205 has a 15.5 mm diameter aperture, LF 305 offers a 20.1 mm diameter aperture, LF 505 provides a 30.2 mm diameter aperture, LF 1005 offers a choice between a 40.5 x 13 mm or 38 mm diameter aperture, and LF 2005 presents a 60.5 x 20.5 mm or 27 mm diameter aperture. These current sensors rely on closed-loop Hall effect technology, which enhances their accuracy and reliability in industrial and railway applications, making them well-suited for a variety of contexts where precise current measurements are crucial.

Key features

• Closed loop (compensated) current sensor using the Hall effect
• Isolated plastic case recognized according to UL 94-V0

Key benefits

• Excellent accuracy
• Very good linearity
• Low-temperature drift
• Optimized response time
• Wide frequency bandwidth
• No insertion losses
• High immunity to external interference
• Current overload capability

Key applications

The LF 205, 305, 505, 1005, and 2005 current sensors are extensively utilized in the industrial sector and the railway sector. In industrial applications, they find application in various scenarios, including:

• AC variable speed drives and servo motor drives
• Static converters for DC motor drives
• Battery-supplied applications
• Uninterruptible Power Supplies (UPS)
• Switched Mode Power Supplies (SPMS)
• Power supplies for welding applications

In the railway area, the LF current transducers can be used in fixed installations or trackside as well as onboard trains (traction). In this specific domain, it is also common to use these sensors in the following applications:

• Single or three-phase inverters
• Propulsion and braking choppers
• Propulsion converters
• Auxiliary converters
• Battery chargers