LR3_40-4/10 – 10Amp AC Inverter Input Choke, 3 Phase

The Block LR3 40-4/10 input choke (line reactor) is designed for use in industrial drive and power conversion systems to improve mains power quality, reduce electrical stress, and enhance the reliability of connected equipment. It provides effective damping of harmonic currents and helps to stabilise supply conditions in installations with inverter-driven loads.

By introducing a defined short-circuit voltage of 3–5% to the mains, the reactor helps limit peak currents, reduce inrush stress, and improve overall system stability. This makes it suitable for demanding applications where power quality and component protection are critical.

The LR3 40-4/10 is suitable for higher current applications and can be used flexibly as a line reactor, commutating reactor, or PFC reactor depending on system design requirements.

Typical applications include:

• Variable frequency drives (VFDs) and inverter systems
• Power factor correction (PFC) installations
• Systems with fluctuating or unstable mains supply
• Industrial environments with high harmonic distortion
• Installations requiring voltage dip bridging and peak current limitation

For optimal performance, the reactor should be selected according to drive input current and installed in series on the supply side of the equipment.

Key Benefits

• Provides defined short-circuit voltage of 3–5% to the mains
• Effective harmonic current damping
• Reduces starting and peak currents
• Helps bridge short voltage dips
• Improves service life of drives and connected equipment
• Reduces ripple and electrical stress
• Suitable for use as line, commutating, or PFC reactor
• Vacuum-impregnated construction for low noise and improved corrosion protection
• Integrated lifting points and multifunctional mounting system for easier installation