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There are many pieces of equipment that can generate EMI (electro magnetic interference), variable frequency drives included. In the case of variable frequency drive, the electrical noise produced is primarily contained in the switching edges of the PWM controller. Increases in switching frequencies also increase the effective edge frequencies produces, thereby increasing the amount of electrical noise.

TCI Trans-Coil KRF Three-Phase EMC Power Line Filters Distributors

KRF EMI Filter

Installation, Operation & Maintenance Manual

KRF filters use a combination of high frequency inductors and capacitors to reduce noise in the critical 150 kHz to 30 MHz frequency range. The inductors act as open circuits and the capacitors act as short circuits at high frequencies while allowing the lower power line frequencies to pass untouched.

KRF filters assist with cost effective compliance to EMC directives, in a compact, efficient, light-weight design. The high common mode and differential mode reduction in the critical 150 kHz to 30 MHz frequency ensures that potential interference from AC drives is reduced or eliminated.

The terms EMI and RFI are often used interchangeably. EMI is actually any frequency of electrical noise, whereas RFI is a specific subset of electrical noise on the EMI spectrum. Conducted EMI is unwanted high frequencies that ride on the AC wave form.

If you are looking for TCI KRF EMI Filters, please call us on (800) 894 - 0412 or email us at we will do our best to help you find the high frequency noise solutions that you are looking for at the most competitive prices possible. If you are searching for KRF 3-phase EMC power line filters technical information (data-sheets) please use the datasheets or product selection guide page links.

The power line noise emissions associated with variable frequency drives can cause disturbances in nearby equipment. Typical disturbances include:

  • Dimmer and ballast instability
  • Lighting disturbances such as flashing
  • Poor radio reception
  • Instability of control systems
  • Common Links
  • low metering fluctuation
  • Computer system failures
  • Remote I/O
  • Encoder feedback
  • Nuisance faults PLC
  • Analog meter bouncing
  • Thermostat control problems


  • 3-Phase
  • System Voltage:
    • 480 VAC (applied to 240 VAC - 520 VAC)
    • 690 VAC (applied to 600 VAC - 760 VAC)
  • Amp Ratings:
    • 480V (8 - 2500)
    • 690V (25 - 2500)
  • Fundamental Frequency: 50/60 Hz
  • Units to accommodate up to 2,500 amps
  • Filtering: Advanced two-stage filtering design
  • Warranty: 1 year
  • Ambient Temperature: -25° to 100° C
  • Maximum Altitude: 1,000 meters (3,000 feet) - Derating necessary above 1,000 meters
  • Short Term Overload Rating: 150% rated I for 3 minutes or 250% for 30 seconds
  • Tested Value: 100% tested for Hipot, ground continuity, input-output continuity and insertion loss characteristic
  • Agency Approvals: ENEC, cUR

Our industrial factory automation supplies distributors warehouse in Boise, Idaho stocks some Trans-Coil products enabling us to further assist you in finding the TCI KRF filter for your application in the USA. Whether we have KRF EMI filter in stock in Boise, Idaho or need to ship direct from Weidmuller to any USA cities; Clearwater Tech can get Trans-Coil KRF EMI filters to you fast and save some money! It will be very helpful if you have the KRF filter part numbers ready, then our sales representatives can provide you with a pricing and availability quote for Trans-Coil KRF filters that you are looking for in seconds. If you do not have the part numbers for TCI KRF EMI Filters, our application engineers will be able to help you figure out the part numbers and get the price quote to you as soon as possible.

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SolaHD Filters

Sola Hevi Duty STF series offers original active tracking technology to guard against, low voltage/high frequency energy transients. Electrical noise caused by everyday events for example, turning on machinery, motors or equipment can be very damaging over time. STF Active Tracking Filters protect your equipment by continuously tracking the input AC power line and eliminating electrical noise using a low-pass or L-C filter

Weidmuller Terminals

Weidmueller WGK series finger proof insulated enclosures are especially suitable as industrial electronic enclosures for frequency converters, power supplies or filter components which offer a convenient and reliable form of connection internally and externally. To match the wire guides to the installation requirements in the best possible way, Weidmuller offers two versions with horizontal (WGK) and vertical