# Riedon Blog

Welcome to the Riedon Blog. Here you will find articles and resources related to all types of resistors and shunts.

## Bourns Model PWR4412 Series

Bourns® Model PWR4412 Series Obsolescence Bourns has announced the obsolescence of their PWR4412 series of metal element current sensing resistors. Customers should not worry because Riedon has an exact drop-in replacement, our MSR series. Here is the data...

## Shunt FAQ – term origins and definitions

DC Ammeter shunt – The term DC ammeter shunt stems from one of the early uses of the devices as a means of measuring DC currents in a circuit utilizing a simple analog milli-volt meter. Many of the terms associated with these products are directly related to this...

## High Current Fuse Holders

What are fuses? High current fuse holders are designed to work in conjunctions with appropriately rated fuses. Fuses are safety devices used to limit the amount of current through an individual circuit branch, or to limit the amount of current delivered from a...

## Riedon’s PF2272 and PF2273 now with resistance values up to 1Mohm

Riedon's PF2272 and PF2274 now feature resistance values up to 1Mohm Advanced manufacturing techniques have allowed Riedon to extend the resistance values available for our two hundred watt (PF2272) and three hundred watt (PF2274) TO-227 packages from 100KΩ to 1MΩ. By...

## Temperature Coefficient of Resistance in Foil Resistors

Temperature Coefficient of Resistance refers to how the resistance value varies due to changes in temperature. One of a foil resistor’s most important properties is Low Temperature Coefficient of Resistance, or TCR. This is especially true for applications like...

## Pulse Applications and Wirewound Resistors

Choosing a resistor for pulse applications can be tricky business. What is the magnitude of the pulse? How long does it last? How often does it repeat? What is an acceptable resistance range? And then there are the multiple resistor technologies to consider. A typical...

## Shunts ; Measuring current taken to a higher level

Precision shunts are very precise resistors inserted into a circuit in order to measure the current flowing through that circuit. The shunt does this by providing a very small voltage drop across its resistance proportional to the current flowing through the shunt. ...

## New Product: Precision DC Current Shunts

DC Current Shunts expansion. Riedon has expanded its line of DC Current Shunts to include current ratings up to 10,000 amps. The RS series of off-the-shelf, base-mounted and bus-bar shunts now offers current ratings from 5 A to 10,000 amps and a number of mounting...

## TO resistor -Thermal resistance and beyond

Heat dissipation is a key factor in the design of a power system; in a world where the trend is for more power in a smaller space, are TO-style packages still the best solution? TO packages were originally intended for discrete transistors, in fact TO stands for...

## Resistor orientation and the thermal EMF effect

Maintaining a constant temperature around precision resistors is integral to maintaining the stability of a circuit. Even small fluctuations in the temperature of a resistor can cause errors in a circuit due to noise. The relationship between temperature and...