(626) 284-9901
[email protected]
Riedon.com
  • Home
  • Cross Reference
  • Technical Information
  • How To Buy
  • FAQs
  • Blog
  • Contact Us
(626) 284-9901 mobile menu link
  • Home
  • Cross Reference
  • Technical Information
  • How To Buy
  • FAQs
  • Contact Us
  • About Us
  • Custom Resistor
Our production facilities will be shut down Friday, December 24th, 2022, returning Monday, January 3rd, 2023.

Precision Shunt Resistor

USR UNR 4-3425 4020

Precision Shunt Resistor

pdf
FNR4-T227.jpg
  • Resistances from 0.05 Ohm to 650 Ohms
  • Power Rating to 50 Watts
  • Resistance Tolerances to ±0.01%
  • TCR to ±1ppm/K
  • Load Stability to 0.01%
  • Backplate Isolated from Leads
Type USR 4-3425  USR 4-4020 UNR 4-3425  UNR 4-4020
Resistance Range1 0.05 to 650 Ohms 0.05 to 100 Ohms
Power Rating
free air 70°C
with heatsink

3W
30W

2.5W
30W

3W
50W

2.5W
50W
Thermal Resistance Rthj-c 3.5 K/W 3.6 K/W 2.1 K/W 2.2 K/W
Tolerances
from 0.05 Ohms
from 10.0 Ohms
from 50.0 Ohms

0.1% / 0.25% / 0.5% / 1%
0.05% / 0.1% / 0.25% / 1%
0.01% / 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 1%
Stability 0.01%
Shelf Life Stability 25ppm / ΔR after 1 year
50ppm / ΔR after 3 year
Temperature Coefficient max. ±5ppm/K (-55 to 155°C)
typ. ±3ppm/K (-55 to 155°C)
upon request ±1ppm/K (25°C to 60°C)
Voltage Proof 750 VDC
Thermal EMF < 1 µV/°K
Operating Temperature Range -55°C to 155°C
Resistor Material NiCr-Foil
Substrate Al2O3 AlN
Housing Epoxy + Al-heatsink
Connector Material Cu tinned
Max. Torque 1.0 Nm

1other resistance values upon request / power rating depending on resistance value

 

pdf See PDF Datasheet for Full Specifications

Custom Resistors
Request Samples

Featured
Products



Download The Current Sense
& Circuit Protection
Brochure Here

Riedon
Brochure





Download Our Brochure

Technical
Calculator


Use this technical resource to learn about Ohm's Law, design RTDs, Voltage Dividers, Wheatstone Bridges and more.

Technical Calculator

Riedon
Guide to Resistors

[email protected]

Riedon
News

  • Purdue house runs entirely on DC power: efficient nano-grid can be powered by solar panels, batteries or local utilities
  • Your Essential Guide on How to Use DC Current Shunts
  • Do You Need a Shunt Resistor? What You Need to Know
  • What is a Pulse Resistor and How to Choose One
  • Current Sense Resistors - How They Work & Improve Efficiency



Copyright © 2023 Riedon

Follow Riedon on Twitter
Follow Riedon on YouTube
Follow Riedon on Facebook
Cross Reference |  Technical Information |   How To Buy |   Contact Us |   About Us |  Custom Designed Resistors |