200Hz-400Hz Output Reactors Liquid Cooled-R4L Series

Superior Cooling Technology. Highest Power Density. Designed for High Frequency Applications.

Product Overview

R4L High Frequency Liquid Cooled Reactors are built for demanding high frequency applications. With permanent magnet motor applications specifically in mind, R4L reactors are designed to operate at frequencies that would easily overheat traditional reactors. The largest companies in the world rely on CTM technology, with more than 200,000 installed units in some of the harshest environments on the planet.

High Frequency Reactor Applications

  • Optimized for PMAC Motor Applications with high frequency signals
  • Up to 400 Hz fundamental frequencies
  • Perfect for High Frequency, High THD Installations

Liquid Cooled Advantages

  • Highest Power Density
  • Lowest Audible Noise with magnetostriction-free design and epoxy enclosed magnetics
  • Sealed Design for Harsh Conditions from nearby electronics
  • Thermally Isolated from Ambient for lower cabinet temperatures
Impedance Levels

1.5%, 3%, 5% and 7% (at 200 Hz / 480 V)

Typical Applications

High Frequency Load Reactors PM Motor Applications Shunt Active Filter Reactor SiC Switching Frequencies

Voltage Range

Up to 690 V

Fundamental Frequency

Up to 400 Hz (higher with de-rating)

Maximum Altitude

No Limit

Maximum Switching Frequency

Up to 50 kHz

Current Range

130 - 1,200 A

Overload Capability

150% rated current for 1 minute

Maximum Coolant Temperature

50 °C (122 °F) (higher with de-rating)

Inductance Curve

95% at 150% load 90% at 200% load 65% at 500% load

Approved Coolants

Drinking water Water-glycol mixture For R134A, contact CTM

Plumbing Material Options

Aluminum (standard) Copper

Heat Removal

97% to Liquid Coolant 3% to Ambient Air

Maximum Ambient Temperature

70 °C (158 °F)

Agency Recognitions

cЯUus 1446

Product Highlights

  • Motor Protection: When installed at the output of a high frequency VFD, R4L reactors limit voltage spikes that can break down motor insulation.
  • PMAC Motor Optimized: Designed specifically with PMAC motor applications in mind, R4L high frequency reactors incorporate features to address concerns unique to these applications.
  • High Frequency: Thermally designed to withstand frequencies that would burn other inductors (up to 400 Hz), R4L reactors utilize advanced, proprietary materials to minimize heating and high current saturation.
  • Inductance for High Frequency: Since an inductor’s impedance is directly proportional to frequency, high frequency applications often require lower inductances. R4L reactors offer 1.5%, 3%, 5%, and 7% impedances, calculated at 200 Hz and 480 V. When combined with the RSL reactor product line (rated to 200 Hz), an extended range of impedance values are realized for high frequency applications.

Liquid Cooled Advantages

  • Highest Power Density: Superior heat removal technology enables smaller magnetics, yielding the highest power density reactors available. Low surface temperatures eliminate clearance requirements, further increasing “effective” power density.
  • Thermal Isolation: With up to 97% of heat removed through the coolant, liquid cooled reactors have negligible effects on cabinet air temperature. No climate control required.
  • Sealed Design for Harsh Environments: RPL Reactors are environmentally sealed, creating an extremely rugged and reliable design ideal for use in the harsh environments.
  • Extremely Low Audible Noise: Due to superior materials and geometric shapes, magnetostriction-induced noise is significantly lower in CTM Reactors. When combined with a sealed package, the result is a nearly silent solution.

Thermal Isolation

CTM liquid cooled reactors will have negligible temperature effects when installed in an existing cabinet. Liquid cooled inductors are thermally isolated from their enclosures, meaning a majority (97%) of the heat is removed directly through the liquid coolant.

In this example, both an air cooled and a liquid cooled reactor are sized for a 600 HP motor application; both reactors are identically 99.5% efficient (0.5% power loss). The air cooled reactor rejects 3,000 watts to the cabinet air, while the equivalent liquid cooled reactor only rejects 90 watts to the air. The remaining 2,910 watts are removed directly by the liquid coolant.

As can be seen in the graph, in a typical NEMA 3R cabinet, installation of an air cooled reactor will increase cabinet air temperature by 20.9°C . The equivalent liquid cooled reactor raises cabinet air temperature by only 1.4°C. The low temperature rise provided by liquid cooled reactors yields increased reliability for all electronics within the cabinet. Low surface temperatures also allow the liquid cooled reactor to smaller clearances, increasing effective power density further.

200Hz-400Hz Output Reactors Liquid Cooled-R4L Series