Power Filters

What Is a Power Filter? 

Most modern electronic equipment generates high-frequency voltages and currents because of switching-mode power supplies and fast digital circuits. A power filter reduces electromagnetic interference or noise in the power line of these devices. This power filter prevents high-frequency signals from making their way to the input power line and stops these signals on AC power distribution systems from entering into equipment. 

Some of the most commonly known sources known for EMI interference include cellular phones, power lines, radio transmission and more. 

The filter allows electronic equipment to meet regulatory standards from the Federal Communications Commission (FCC) in the United States and the International Electrotechnical Commission (IEC) standard abroad. 

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Types of Power Filters

There are different types of power filters that match unique scenarios. These power filter types include: 

  • Single-phase filter: The single-phase focuses on a single-, two- or three-stage circuit and filters 240VAC. The single-stage is a general application tool. The two-stage circuit fits very noisy environments since it has higher attenuation. The three-stage circuit suits situations with the most extreme attenuation, like aviation or military applications. 
  • Three-phase filter: The three-phase filter can attenuate EMI in electrical systems with 440VAC, 480VAC, 520VAC or 690VAC power. These filters suit applications like mining, pumping, refrigeration, HVAC and more. 
  • Three-phase and neutral filter: The three-phase and neutral filters can handle 440VAC, 480VAC and 520VAC for three-phase electrical systems that also need a neutral connection. 

The power filters also come in AC or DC. The Rated Current limit for a power filter is 100A. Typically, power filters come in Rated Current options including 3A, 6A, 10A or 15A. 

EMI Versus RFI Power Filters

There are also two types of interference blocked by power filters. Although some people use the terms electromagnetic interference (EMI) and radio frequency interference (RFI) interchangeably, they are not the same. EMI refers to any type of noise emission from an electrical product that causes interference, while RFI is a subset of EMI. More specifically, RFI is a subcategory that focuses on a specific type of electrical noise within EMI’s spectrum. The source can be artificial or natural, like sunlight or the radiation from an electrical circuit. 

There are two types of RFI, including conducted RFI and radiated RFI. Conducted RFI occurs when a high frequency rides on an AC waveform to cause a disturbance. Radiated RFI only travels when something emits it through the air.

Select Your Power Filter Solution Today

Need to replace power filters or find help with repairs for your organization? Visit our large selection of power filters above to find a fit for your company project and receive a quote. You can also contact Global Electronic Services to touch base with a highly trained and certified technician. 

Speak with a helpful representative on the phone at 877-249-1701 or send us your question via our convenient contact form

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