Inverter Isolation Chokes

Modern inverter-driven systems demand high reliability, low EMI, and optimized harmonic filtering. If you’re facing inconsistent drive performance, overheating of components, or compliance challenges with IEEE 519 standards—our Inverter Isolation Chokes addresses these challenges at their root. Designed to isolate sensitive inverters from upstream grid disturbances, these chokes serve as a first line of defense for power integrity. 

Rated System Voltage

400 V / 415 V / 480 V / 690 V AC

Tuning Frequency

189 Hz / 210 Hz for 50 Hz systems

Inductance Tolerance

±5% (measured at rated current and 50 Hz)

Core Material

CRGO silicon steel / Amorphous metal

Insulation Class

Class H (180°C thermal endurance)

Product Description

High-frequency switching transients and common-mode voltages are key contributors to premature motor bearing failures. Our isolation chokes suppress these high-frequency disturbances before they propagate, minimizing bearing currents and motor insulation stress. This ensures longer motor life and reduced maintenance costs in VFD and inverter-fed systems. 

Maximum Hot Spot Temperature

155°C continuous with 180°C short-duration withstand

Rated Harmonic Current

Up to 150% of fundamental current

Total Inductor Losses

≤ 3 W per reactive kVAR at rated harmonic profile

Dielectric Withstand Voltage

3 kV AC for 1 minute between windings and core

Magnetic Flux Density (Bmax)

≤ 1.6 Tesla at rated load, below saturation threshold

Short Circuit Thermal Withstand

1.8 x Irms for 1 second (IEC 60076-6 compliance)

Detuning Reactance (Uk%)

Typically 6%, 7%, or 14% depending on required detuning frequency

Winding Configuration

Copper/Aluminum, foil or round wire, thermally balanced with insulation barriers

Mounting Configuration

Base-mounted with vibration-damped brackets and slotted holes for alignment

Acoustic Noise Level

≤ 65 dB at 1 meter under rated harmonic loading

Technical Advantages

When you’re integrating power electronics into sensitive grids, managing reflected harmonics and transient voltage spikes becomes critical. Our Inverter Isolation Chokes offer high differential-mode impedance tailored for the inverter’s switching characteristics, allowing compliance with EN 61000-6-4, IEC 60034-17, and IEEE 519. This ensures smoother grid interaction, enabling you to deploy high-power systems without violating harmonic limits. 

Overheating of magnetic components often leads to derating and unplanned downtimes. Engineered with low-loss, high-permeability core materials and optimized thermal dissipation geometry, our inverter isolation chokes operate efficiently under continuous duty, even in compact enclosures. This prevents hot-spot formation and maintains stable inductance across load cycles. 

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Industry Applications

Renewable Energy Inverter Systems

Suppresses high-frequency disturbances and stabilizes inverter output, ensuring grid compliance in solar and wind power conversion applications. 

HVAC and Building Automation

Filters inverter-generated electrical noise to prevent interference with control circuits and reduce component stress in fan and pump systems. 

CNC and Precision Machinery

Reduces voltage reflection and overshoot at motor terminals, maintaining insulation integrity in high-speed, precision-controlled servo applications. 

Elevator and Lift Systems

Isolates inverter-induced voltage transients, ensuring stable motor operation and enhancing safety in regenerative braking lift applications. 

Oil and Gas Drilling Rigs

Provides electromagnetic isolation and voltage stability for inverter-fed motors operating under fluctuating loads and harsh environmental conditions. 

Battery Energy Storage Systems (BESS)

Filters inverter ripple currents and reduces electromagnetic emissions during charge-discharge cycles to improve battery life and system efficiency.

Inverter Isolation Chokes

Minimize Electromagnetic Interference (EMI)

Inverter switching generates significant EMI that can corrupt signals in nearby instrumentation or control lines. Our chokes offer superior high-frequency attenuation in both common-mode and differential-mode paths. The result? Clean output signals, protected sensitive electronics, and increased system immunity against electromagnetic noise. 

Each application—whether it’s industrial automation, renewable energy, or HVAC—presents unique operational stresses. We offer custom winding configurations, insulation classes, and core geometries tailored to your exact inverter topology and switching frequency range. Whether you need high-temperature operation, moisture resistance, or compact form factor—our engineering team aligns the choke design with your operational environment. 

 

Inverter Isolation Chokes

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate design its inverter isolation chokes to handle inverter switching noise in high-power applications?

Frigate uses core materials with high saturation flux density to prevent core distortion under fast switching transients. The winding layout minimizes parasitic capacitance while maintaining effective impedance at switching frequencies. Each choke is tuned to the inverter’s pulse width modulation (PWM) profile. This ensures minimal noise transmission and reduced harmonic injection. 

What makes Frigate's isolation chokes suitable for regenerative inverter systems with bidirectional power flow?

Frigate designs chokes with symmetrical inductance and low core hysteresis losses to handle bidirectional current flow efficiently. The construction allows stable impedance in both motoring and regenerative modes. Inverter isolation chokes also withstand frequent direction switching without affecting magnetic performance. It helps maintain voltage control and power quality in dynamic loads. 

How does Frigate ensure inductance stability in high ambient temperature installations?

Frigate uses thermally rated Class H insulation and low-loss core materials that resist saturation even at elevated temperatures. The design includes optimized air gaps and cooling paths. This allows the choke to maintain inductance with minimal drift under thermal stress. As a result, performance remains stable during continuous duty cycles. 

 

Can Frigate isolation chokes be customized for inverter systems with varying cable lengths and load conditions?

Yes. Frigate tailors inductance, core selection, and winding geometry based on load impedance and cable reflection profiles. The customization helps to suppress voltage overshoot and match impedance across inverter-motor systems. This avoids insulation damage and enhances system reliability. 

What testing procedures does Frigate follow to validate inverter isolation chokes performance in real inverter environments?

Frigate performs thermal imaging, B-H loop analysis, and high-frequency impedance scans during product validation. Chokes are tested under simulated inverter switching with representative load profiles. This ensures reliable operation across the full frequency and temperature spectrum. Each choke is delivered with test data to match application-specific parameters.

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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

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Inverter Isolation Chokes

Need reliable wires and cables for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

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Inverter Isolation Chokes

Need reliable Machining for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

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