Product Overview  |  Technical Specification  |  Applications

Harmonic Reduction
Because all standard Guard-AC reactors are compensated for harmonics (current and frequency), they are extremely effective at reducing the amount of harmonics which are produced by a drive/inverter.
Use 5% impedance, harmonic compensated reactors for best reduction of harmonic distortion.

Reactor Linearity This curve illustrates the linearity of Guard-AC reactors. Even at 150 percent of their current rating, these reactors still have 100% of their nominal inductance. This assures maximum filtering of distortion even in the presence of severe harmonics and best absorption of surges. The typical tolerance on rated inductance is plus-or-minus 5 percent.

You Benefit From These Unique Features
HARMONIC COMPENSATION makes Guard-AC reactors suitable for use on either the drive input or drive output. They are designed to carry full rated fundamental current plus handle current and frequencies associated with harmonics up to 50 percent more.

TERMINALS are provided as standard to save installation cost and minimize panel space. Finger proof (IP20) terminals are provided through 45 amps, solid copper box lugs above that to 400 amps. Tab type terminals are available as an option.

IGBT PROTECTION allows all MTE standard reactors to be used on the output of variable frequency drives including IGBT types with switching frequencies up to 20 KHZ. A premium dielectric system is utilized to protect the first, last and end turns from the potentially high circuit peak voltages and fast dv/dt which are experienced in applications with long leads between the inverter and motor. Additionally, the general dielectric system of each reactor meets UL-506 (4000 volts rms).

EPOXY IMPREGNATION minimizes audible noise in the reactor and enhances structural integrity.

HIGH SATURATION CURRENT RATING of Guard-AC reactors maximizes their surge current protection capability. Guard-AC reactors absorb many of the power line disturbances which cause nuisance trips on voltage source inverters.
 

Outline Dimentions All Guard-AC reactors are supplied with field wiring terminals, as illustrated. Units rated 45 amperes or below are supplied with the international terminal block as shown. Reactors rated above 45 amperes thru 400 amperes are supplied with solid copper box lugs. Larger reactors are supplied with copper tab type terminals.

Motor Protection Reactors help to protect motors from the high peak voltages and fast rise times (dv/dt) which can be experienced in IGBT inverter applications when the distance between the inverter and motor is long. LC Type(dv/dt) Long Lead Filters These motor protection filters are available to improve the inverter output wave form from a PWM type to a nearly sinusoidal wave form.

Voltage Spike Protection A 3% impedance reactor is very effective at protecting against damage to or nuisance tripping of AC voltage source inverters, due to voltage spikes. Voltage spikes on the AC power lines cause elevation of the DC Bus voltage which may cause the inverter to "trip-off" and indicate an over-voltage protection condition. Use reactors to absorb these line spikes and offer protection to the rectifiers and DC Bus capacitors while minimizing nuisance tripping of the inverter.

NEMA 1 Cabinets All Guard-AC reactors are available as either open type or in a NEMA Type 1 general purpose enclosure. To order a reactor mounted in a cabinet simply change the second last digit of the part number from "0" to "1". Example RL- 00802 becomes RL-00812.