Electrical Component FAQs

RFI Filters, Terminal Blocks and Other Electrical Component Solutions

Curtis Industries’ professional electrical component manufacturers create standard and custom terminal blocks and EMI filters.  Our experienced engineers focus on quality to provide the best electrical components available.  Curtis Industries’ is the leading electrical component manufacturer, producing parts with only the best materials and affordable solutions for your business.

Our engineering specialists are the finest electrical component manufactures in the industry.  We create high quality terminal blocks, RFI power line filters, relay sockets, DIN rail blocks, PC board terminal blocks and liquid level controls. Curtis Industries’ reliable electrical components can be ordered in standard form or custom built to your exact specifications.  Our custom terminal blocks are created to suit the specific needs of your machinery.  We first design prototypes, then manufacture and test the line filters to ensure quality.  Curtis Industries experienced electrical component manufacturers provide the best, most cost effective EMI filters and custom terminal blocks on the market.

Curtis Industries produces many reliable parts for a variety of applications.  Our dependable electrical components are manufactured for industrial, instrumentation, power supply, telecom, medical, commercial, appliances, machinery control, aerospace and military solutions. Curtis Industries patented technology and experience in many industrial applications provide innovative custom solutions for any business.

We have been manufacturing standard and custom electrical components for over 75 years.  Curtis Industries is the most knowledgeable on RFI filters, custom terminal blocks and power line filters in the industry.  Our expertise in electrical component manufacturing provides the highest quality components for your business solutions. 

Unequaled expertise in electrical component engineering allows our specialists to precisely answer any questions you may have about our EMI filters, power line filters, or terminal blocks.  View our frequently asked questions below to learn about our well built custom electrical components. 

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  As a manufacturer of electronic equipment, why do I need to be concerned with RFI?  TOP

Since no electronic equipment operates in total isolation, manufacturers must protect their own equipment from RFI noise produced by other devices functioning in close proximity or on the same power source. They are also responsible for making sure that their equipment does not transmit offending RFI noise, resulting in the malfunction of other devices.

  How are custom molded electrical components made?  TOP

While our specific methods for creating custom molded electrical components can include horizontal and vertical injection, as well as vertical transfer and compression; the basic process works using the same core principle.  Curtis Industries builds our own stamping dies and metal components that will be used to create a custom mold for your component.  Then, we use one of our high temperature resins to complete the process.  Some of these filled and unfilled resins include:

  • PP (Polypropylenes)
  • PEI (Polyetherimide)
  • Various nylons
  • Thermoset resins

The type of resin used will vary depending on what exactly is being made.  We have created high-quality custom molded electrical components from scratch for high profile companies and business in the medical, gaming, electronic, and even military fields.

  How can RFI be controlled?  TOP

Radiated RFI is usually contolled by providing proper shielding in the enclosure of the equipment. Conducted RFI can be attenuated to satisfactory levels by including a power line filter in the system. The filter suppresses conducted noise leaving the unit, reducing RFI to aceptable levels. It also helps to lower the susceptibility of the equipment to incoming power line noise that can affect its performance.

  How do liquid level temperature and process controls work?  TOP

Liquid level temperature controls can encompass a wide range of devices that usually have adjustable sensitivity levels. Some of these include shut-off switches or valves.

  How do PC Board Blocks Work?  TOP

PC board blocks are typically installed and attached directly to the computer using a special tool called a soldering iron. They function as connectors and use a wide variety of innovative designs in order to ensure a sturdy, secure connection that is meant to last.  Some of these standard designs include screw connections, IDC fast connection, and push in technology. PC blocks are considered to be a standard computer component, and due to their vital importance as connectors it is extremely vital that only quality PC components like products by Curtis Industries should be used.

  How do RFI power line filters work?  TOP

Consisting of a multiple-port network of passive components arranged as a dual low-pass filter, the RFI filter attenuates radio frequency current to pass through with little or no attenuation. Their function, essentially, is to trap noise and to prevent it from entering or leaving your equipment.

RFI is conducted through a power line in two modes. Asymmetric or common mode noise occurs between the line and ground. Symmetric or differential mode is measured from line to line.

  How do these devices cause RFI?  TOP

An electrical or electronic device emits RFI in two ways:

  1. Radiated RFI is emitted directly into the environment from the equipment itself.
  2. Conducted RFI is released from components and equipment through the power line cord into the AC pwer line network of the building. This conducted RFI can affect the performance of other devices on the same network.
  What are some different types of liquid level temperature and process control products available?  TOP

The specific type of fluid level control device that will be best for you ultimately depends on the specific conditions involve in the industrial process as a whole.  Currently some of the industry’s preferred liquid level temperature and process gadgets include:

  • Probes
  • Electronic emitters and data interpreter combos
  • Regulatory valves

These devices, while they may appear to be menial, can actually eliminate the potential for human error and divert valuable labor towards industrial processes that require higher levels of attention to detail.  

  What exactly are Liquid Level Temperature and Process Controls?  TOP

Liquid level temperature and process controls utilize both mechanical and electronic technology in order to stop, start, and regulate certain properties using the properties of a specific liquid.

  What exactly are PC Board Blocks?  TOP

PC Board Terminal Blocks are an assembled collection of computer components that attach directly to the computer’s main circuit board.  Their sole purpose is to function as a centralized system of connectors.  They can pose as outlets for a wide variety of different components depending on their intended purpose; but typically they connect and transmit signals, data streams, and power sources to the machine.

  What exactly is RFI?  TOP

Radio frequency interference (RFI) is the radiation or conduction of radio frequency energy (or electronic noise produced by electrical and electronic devices at levels that interfere with the operation of adjacent equipment. Frequency ranges of most concern at 10 kHz to 30 MHz (conducted) and 30 MHz to 1 GHz (radiated).

  What is the government's role in regulating RFI?  TOP

Governments and safety agencies of major industrial countries, including the United States, Canada, Germany, Sweden, and Switzerland, have established noise emission regulations that are focused on digital and other electronic equipment. The most important of these guidelines are FCC docket 20780 in the United States and VDE 0871 and VDE 0875 in Germany.

FCC docket 20780 (Part 15, Subpart J) regulates the RF interference of electronic computing devices, defined as any electronic devices or system that generates and uses timeing signals or pulses at a rate in excessof 10,000 pulses (cycles) per second and uses digital techniques. This definition includes telephone equipment that utilizes digital techniques and any device or system that generates and uses radio frequency energy for the purpose of performing data-processing functions such as electronic computations, operations, transformations, recording, filing, sorting, storage, retrieval or transfer.

FCC regulations are broken down into Class A computing devices marketed for use in commercial, industrial or business environments, and Class B devices intended for use in a residential environment.

Verband Deutscher Electrontechniker (VDE), the Association of German Electrical Engineers, has established two guidelines on radio frequency interference, generally adhered to throughout Europe. VDE 0871 governs didital equipment generating a broad spectrum of energy in the 10 KHz to 1 GHz range. VDE 0875 applies to digital and non-digital equipment with low-frequency limits of 150 KHz.

In addition to governmental regulations, safety agencies worldwide have established guidelines for all electrical/electronic components. These include UL, CSA, VDE and SEV. They are designed to protect against shock and fire hazard.

  What types of devices typically case RFI?  TOP

Most electrical or electronic equipment can produce RFI. The most common sources include components such as switching power supplies, relays, motors and triacs, and equipment such as business computing devices, work processors, electronic printers, medical instrumentation, industrial controls, personal computers and electronic games.

  Why not use cheap, generic, PC blocks?  TOP

Cheap and generic PC blocks produced in mass quantities may work, for a while. However, whenever these inferior products start to give you problems (and they will cause problems), repairs can often be a headache.  Large quantities of time is wasted during the troubleshooting process, while meticulously tracking down the faulty connection, and eventually out of sheer frustration many people find themselves replacing the entire PC Board Block with a Curtis Industries product anyways.

  Why should I specify CURTIS RFI power line filters?  TOP

Only Curtis tests for quality and specification compliance, including insertion loss, on a 100% production basis. We employ a rigorous component qualification program and thorough incoming and on-line inspection procedures. And our computer-controlled 100% safety and performance testing to demanding customer requirements is your assurance of the highest quality RFI filters available today.

  Why use Curtis Industries for your custom molded electrical components?  TOP

We often get asked what it is that sets us apart from our competitors when it comes to producing high quality, custom molded, electrical components. Curtis Industries is unique in the sense that we don’t produce cheap, mass produced, one size fits all components. Rather we custom build our molds and use high quality resins to create components that are insulated against electricity and designed with your specifications in mind. Unlike our competitors we actually spend a great deal of time with our customers. We continually work consult and verify every square inch of the design process with you before we begin production. We understand that custom molded electrical components are not cheap, but with Curtis Industries you get what you pay for. With us, you can be guaranteed that you will have the perfect component before we start production.