Line Reactors protect Variable Frequency Drives (VFDs) from input power line disturbances by smoothing and slowing down incoming voltage distortion.

Line reactors are SOP in my VFD designs, sized per OEM requirments. RF Line Filters are added between the SS/GF Fuse/CB and the line reactors when needed for Euro-land requirements. Failing internal parts may mean that your branch circuit devices were supposed to be semiconductor rated for drive I*I*T protection. Doublecheck that OEM manual.

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When a reactor is installed between the power system and the VFD, it is known as an AC line reactor. When a DC reactor is inserted into the 

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The Line Reactors are also called as Line Chokes or Inductors; Line reactors are electromagnetic devices which consist of a steel core 

Reactors can protect both motors and variable frequency drives (VFDs) from harmful current and voltage spikes. Reactors also help reduce power line distortion, 

Line reactors are electromagnetic devices used as inductors to protect variable frequency drives (VFDs) and other devices from electrical 

10/1 · Line Reactors – connected between AC Line Source and the input of a Variable Frequency Drive (VFD) and protects the drive from tripping nuisance and damages. Load Reactors on the other hand are used at the load side of a VFD to protect motors if the wiring distance between the VFD and motor is very long (over 100 feet)

6/14 · Line Reactors for vfd They are also known as input reactors as they are installed at the input side of the VFD. Their primary role is to protect the VFD from incoming line voltage distortion such as spikes and surges. Switching transients can peak over 1000 volts.

Generally, if there is over 100 feet of wire between the VFD and the motor then you should install a load reactor. Some motors can handle up to 300 feet of wire if they meet the NEMA MG-1 Part 31 standard. Line Reactor If your input power is prone to having spikes then installing a line reactor will smooth out that spike to help protect your VFD.