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3 Phase Line Chokes

The essential "Firewall" for your AC Drives (VFDs). Reduces harmonic distortion, absorbs power spikes, and extends the lifespan of your electronic motor controllers.

Harmonic Filter VFD Protection
Impedance 3% and 5% Available
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Why You Need It

Variable Frequency Drives (VFDs) and Inverters are notorious for creating "electrical noise" (Harmonics) that pollutes the grid. Conversely, grid voltage spikes can destroy the sensitive rectifiers inside a VFD.

A **Line Choke** acts as a two-way buffer.
1. It stops grid surges from damaging the Drive.
2. It stops the Drive from sending dirty harmonics back into the grid.

Working Principle

It works by introducing Inductive Reactance into the line:

1. Current Smoothing: The copper coil creates a magnetic field that resists sudden changes in current, effectively "smoothing out" spikes.
2. Harmonic Mitigation: It increases the impedance of the line, which significantly reduces low-frequency harmonics (5th, 7th, 11th orders) generated by non-linear loads.
3. Short Circuit Limit: In case of a fault, the choke restricts the maximum current flow, giving fuses and breakers time to trip safely.

Key Benefits

Extends Drive Life

Protects the DC bus capacitors and rectifiers inside your VFDs from failure.

Stops Nuisance Tripping

Prevents drives from tripping on "Over Voltage" errors caused by utility capacitor switching.

Reduces Harmonics

Keeps THD (Total Harmonic Distortion) within IEEE 519 limits.

Cool Operation

Vacuum impregnated coils ensure low audible noise and efficient heat dissipation.

Technical Specifications

Power Rating 0.75 kW to 500 kW (1 HP to 650 HP)
System Voltage 415V / 480V / 690V (3 Phase)
Impedance Drop 3% (Standard) or 5% (High Filtration)
Frequency 50 Hz / 60 Hz
Insulation Class Class F (155°C) or Class H (180°C)
Overload Capacity 150% for 60 seconds
Winding Material EC Grade Copper / Aluminum

Ideal Applications

AC Variable Frequency Drives (VFD) Solar Inverters UPS Systems (Input/Output) Robotics & Automation Water Treatment Pumps Wind Turbines