MH&W International Corporation presents CoolTUBE® Radiated Emissions Absorber for the highest reliability and longevity of your VFD motor system!

Variable Frequency Drives (VFD) create Electromagnetic Interference (EMI), conducted and radiated, in VFD motor systems. Without the use of some type of filter or choke system, related failures will occur. Unique to the industry, CoolTUBE® absorbs this high frequency noise before it gets to the motor system and causes damage. By acting as a common mode choke and absorbing the damaging high frequency noise (frequencies from approximately 5MHZ-1GHz), you can maximize equipment reliability, reduce maintenance costs, and avoid unscheduled downtime. CoolTUBE® mitigates radiated EMI issues in all VFD motors including servo and DC motors.

CoolTUBE®Nanocrystalline absorbers are superior to other soft magnetic materials like ferrites because of significant advantages concerning their magnetic properties. Therefore, only about 20% of ‘magnetic mass’ is required.

CoolTUBE® Product Selection Guide


CoolTUBE® Power Range Number of CoolTUBE® per cable length (Feet)
Part # HP Finished Dimensions (in) lsat 1-150 151-300 301-450 451-900*
CT17X135 HP1/4-10A8 1/4-10 ≤1.42 x ≥0.7 x ≤5.31 8 1 2 3 4
CT35X240 HP11-40A14 11-40 ≤2.58 x ≥1.38 x ≤9.45 14 1 2 3 4
CT54X360 HP41-100A18 41-100 ≤3.54 x ≥2.13 x ≤14.17 18 1 2 3 4
CT195X415 HP101-428A40 101-428 See Datasheet 40 1 2 3 4
CT240X473 HP429-1600A50 429-1600 See Datasheet 50 1 2 3 4

Note 1 - Data above is for information/guideline purposes.
Note 2 - All cables/phases must travel through the CoolTUBE® cores. No ground or shielding through cores!
Note 3 – One CoolTUBE® per 150 feet.
Note 4 - It is important to use the correct number and type of each CoolTUBE®.
Note 5 - Install cores on load side of drive for typical motor applications.
Note 6 - Please call CoolTUBE® Engineering for more information.

* For cable runs over 900ft, contact CoolTUBE® Engineering.