Go to  NexTek Homepage
High Current DC Filters  
Extreme Environment Devices
55 Amperes - Standard Version  
140 Amperes - Standard Version  
400 Amperes - Standard Version  
Standard (inch) Series  
50 Amperes - Standard Version  
100 Amperes - Standard Version  
175 Amperes - Standard Version  
250 Amperes - Standard Version  
Extreme Environment Devices  
55 Amperes Extreme Edition  
140 Amperes Extreme Edition  
400 Amperes Extreme Edition  
Standard (inch) Series  
50 Amperes Extreme Edition  
100 Amperes Extreme Edition  
175 Amperes Extreme Edition  
250 Amperes Extreme Edition  
Custom Designs  
Lightning Arrestors  
Click to see the latest eNewsletter  
  High Current Filtering Selection Guide - The HPR Series  
  This HPR series of extremely high current filters is ruggedly designed to operate at current levels up to 400 amperes and voltages up to 500 Vdc. A large range of available capacitance provides significant insertion loss at frequencies as low as 1 KHz, and provides over 60 db insertion loss to above 1 GHz. The unique ability to remove high frequency noise from very high current lines makes our patented HPR a proven and economical solution to your high current filter application.  
HPR High Current Filters
  High Performance Filtering Technology  
  EMI filters use two basic elements: series impedances, usually inductors, and shunt impedances, usually capacitors. These capacitors and inductors, configured as a low pass filter, reduce unwanted electrical energy entering or leaving a circuit. The capacitor's impedance is severely affected by lead inductance. Leaded capacitors are ineffective filters above the self resonant frequency, usually greater than a few megahertz, due to parasitic lead inductance. To achieve high frequency filtering, lead length must be very near zero.

Selection Questions

  1. Current Level in Amps?
    • HPRs available from <50Amps to 400Amps+ Rated, customs possible
  2. Voltage Level and Type of Power (i.e. DC or AC)?
    • DC Voltages up to 500Vdc and 120Vac use any model, for Higher Voltages use Metric HPR family (HPR055, 140, and 400)
  3. Desired Cut-Off Frequency (Fco) OR Capacitor Value
    • Fco Determined by Capacitance Value - See Chart Pg. 2
  4. Extreme Reliability Required? (E-Series)
    • For details on E-series see Pg. 3
  5. Capacitance Value Tolerance?
    • Default is "Z" code, for +80/-20%, others available
  Click here for a full HPR Model Range Selection Guide (.PDF)  
  Click here for a general High Current Filtering Brochure (.PDF)  
  Learn more about specific models within NexTek's HPR Model Range by using the direct links on the left side of the page.  
  For more info on Feedthrough Filtering, explore our Resources Section!  


Nextek is the manufacturer of all the products listed in these pages. We are not a reseller or distributor.

Nextek Engineering designs only the highest quality devices: Poorly designed and manufactured devices can greatly reduce RF signal quality, be susceptible to weather elements, and fail to protect over time.

Be smart, don't settle for cheap protection of your valuable equipment.

Lightning protectors are also known as lightning arrestors, lightning suppressors, surge protectors, surge arrestors, and surge suppressors.

High Current Filters are also known as feedthrough filters, EMI filters, RFI filters, power filters, and low-pass filters.


©NexTek Inc., All rights reserved.