LR3-AE125-404-0 – 125Amp AC Inverter Input Choke, 3 Phase

The Block LR3-A series input choke (also referred to as ‘line reactor‘) is designed to reduce harmonic currents and voltage distortion generated by inverter drives and other power electronic equipment. It improves overall power quality while helping to protect connected equipment from mains-borne interference.

Input chokes are commonly used with variable frequency drives (VFDs), inverters, and motor control systems to limit inrush current, reduce stress on components, and extend equipment lifespan.

They are particularly beneficial in installations where the mains supply quality may be poor or unstable, or where other high-current switching devices are present on the same network.

Typical applications include:

• Systems with poor or unknown mains supply quality
• Installations with high-current switching loads (e.g. DC drives, soft starters)
• Low impedance power supplies
• Industrial or remote locations where voltage disturbances may occur

For optimal performance, the input choke should be correctly sized to match the drive and installed on the supply side of the equipment.

Key Benefits

• Reduces harmonic distortion on the mains supply
• Improves power quality and system performance
• Protects equipment from voltage spikes and transients
• Extends the lifespan of drives and connected components
• Suitable for industrial drive and inverter applications

This variant of the LR3-A series input choke is rated 125Amp for use with corresponding load requirements and should be selected based on the drive input current.