The Optimal Solution for Harmonic Mitigation & IEEE-519 Compliance

GridHawk® Passive Harmonic Filters (50/60 Hz)

CTM Magnetics GridHawk passive harmonic filters are a size and cost optimized solution that solves harmonic distortion and guarantees IEEE-519 compliance. The GridHawk filter is specifically designed to handle extreme levels of background voltage distortion of up to 15% THVD without requiring a filter derate. With a built in cooling system, sealed contactors, and a robust capacitor safety circuit, GridHawk filters provide year round peace of mind.

  • Environmentally Rugged
  • Extreme Voltage Distortion Capable
  • Robust & Reliable Capacitor Circuit

Product Options

  • Air Cooled
  • Liquid Cooled
Package Options
  • MagPallet™ Cabinet (NEMA 3R)
  • MagStand™ Cabinet (NEMA 3R)
  • MagPac™ VFD Integrated (NEMA 3R)
  • Open Chassis Modular & Integrated Options
Capacitor Contactor Options
  • No Capacitor Contactors (000)
  • Capacitor Contactors Requiring Customer Control (100)
  • Capacitor Contactors with On-Board Control (200)


Line Power
Generator Power

GridHawk vs The Competition


  • GridHawk - Environmentally sealed contactors
  • Highly reliable film capacitors
  • Rated for 15% background voltage distortion (NO derate)
  • Integrated cooling system

The Competition

  • Unprotected contactors (prove to fail)
  • Electrolytic capacitors
  • Filter derate required above 5% background voltage distortion
  • Cooling system not included


The GridHawk Advantage

No Derate Required

  • Smallest Size & optimized cost
  • 0-15% background voltage distortion

Reliable Performance

  • Thermally protected capacitors & inductors.
  • Highly efficient patented inductors & capacitors.
  • No common mode noise.

Plug & Play

  • Simple 3-in/3-out connection
  • No additional cooling required

Environmentally Rugged

  • Dust, wind, rain, weather proof (NEMA 3R)
  • -50°c - +50°c


The Optimal Solution for Grid Protection

Grid Protection:
Harmful harmonics are filtered from the inverter input, protecting the grid from VFD produced harmonic distortion.

IEEE-519 Compliance:
CTM Magnetics GridHawk® passive harmonic filters are engineered to meet stringent IEEE-519 requirements for mitigating harmonic distortion. GridHawk® passive harmonic filters are designed for extreme levels of grid voltage distortion ≤ 23% without requiring a derate. Guaranteed performance in even the most demanding environments.

Environmentally Sealed Contactors:
Every contactor used in a GridHawk® passive harmonic filter is installed in an environmentally sealed enclosure. If capacitor contactors are not environmentally sealed, dust & debris have a high likelihood of causing contactor failure. When contactors fail, the capacitors are removed from the filter electrical circuit. This significantly reduces the performance of the harmonic filter, preventing IEEE-519 compliance.

Extended System Life and Reliability:
All GridHawk® passive harmonic filters come with thermal protection for both the capacitors and inductors. CTM Magnetics patented inductor technology and highly efficient film capacitors combined with environmentally sealed contactors, and a robust thermal protection circuit, provide best in class performance and reliability.


GridHawk® Product Specs

Typical Applications
Six-Pulse Rectifier (generator compatible)

Input Voltage/Frequency
480 V ±10% / 60 Hz

Current Range
GRIDHAWK®: 80 A - 525 A (Air Cooled) | 80 A - 950 A (Liquid Cooled)
GRIDHAWK® HD: 80 A - 525 A (Air Cooled) | 80 A - 740 A (Liquid Cooled)

Maximum THID
<5% @ Full Load | <8% @ 25% Load

Overload Capability
150% rated current for 1 minute (Air)
200% rated current for 1 minute (Liquid)

Enclosure Options
Modular Panel (Air & Liquid Cooled)
NEMA 3R Cabinet (Air Cooled Only)

Capacitor Contactors
0 - No contactor
1 - Contactor for capacitor disconnect (customer control required)
2 - Contactor for capacitor disconnect with automatic pick-up and drop-out (on-board intelligence)

Agency Recognitions
cЯUus 1446 | UL 508A

Ambient Temperature Limits
Maximum: 50 °C (122 °F) (Air) | 65 °C (149 °F) (Liquid)
Minimum: -50 °C (-58 °F) (Air) | -40 °C (-40 °F) (Liquid)

Preventative measures should be taken to ensure the coolant does not freeze in the system. For UL 508A listing, the maximum ambient temperature is 40 °C (104 °F).

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