Wire Wound Resistors

Wire Wound Resistor and Power Resistor Manufacturing Update – July 2017

13 July 2017

Current manufacturing lead times on our range of power resistors and wirewound resistors are currently running at 1 to 2 weeks, however for urgent orders please contact us and we can generally expedite delivery if required.

For reasonable quantities we can supply aluminium housed (metal clad) resistors in the following wattages:

5 watts
10 watts
25 watts
50 watts
80 watts
100 watts
250 watts

These resistors feature compact size for their wattage and are mechanically robust and offer high precision. The are available in a non inductive winding as an option.

Resistor Samples

We can provide samples of resistors for engineering evaluation and can typically supply samples with […]

Update February 2016 – Wire Wound Resistors, Wire Wound Potentiometers and Power Resistor Lead Times

13 February 2016. We get a number of requests for lead time updates on our range of resistive products. Lead times can vary depending on our order backlog, stock of components parts and holiday seasons. We can typically react very quickly to all customer orders. Our suggestion is to contact us with your resistor requirement including type of resistors required, the quantity required and any special requirements including urgent delivery. We look forward to assisting you and look forward to your enquiry.

February 14th, 2016|Power Resistor, wire wound potentiometer, Wire Wound Resistors|

Cement Power Resistor

The term cement power resistor refers to a design and construction method of producing wire wound resistors and power resistors. This method of construction has been used for over 70 years and is still widely used today to produce resistors with these characteristics:

high reliability
low cost production
stable temperature performance
compact design
wide range of power ratings possible
resistance tappings possible
ease of mounting and a variety of types of mounting brackets available

Construction Of Cement Filled Resistors

The above image shows a PW50 50 watt wire wound resistor. The resistance winding is encased in a rectangular ‘ceramic boat’. Once the winding is placed into this ‘boat’ it is […]

Wirewound Potentiometer Applications

Wirewound Potentiometer – Power Rated Variable Resistor
The requirement for variable resistance in electrical and electronic circuits has existed ever since electrical engineering has been around. From the early days of valve based radio and television, there has been a requirement for a variable resistance that has a power rating of several watts.

The AW 3 watt wirewound potentiometer manufactured by Australian Resistors has been the ‘standard’ for wirewound potentiometers in Australia for over 50 years. It has also been extensively exported around the world due to its reputation for long term reliability and economic pricing. There is a strong distributor network for […]

Custom Power Resistor Manufacturing

Being Australia’s largest manufacturer of wire wound and power resistors, Australian Resistors has the capacity to manufacture custom designed resistor assemblies to meet customer specifications. We generally work with clients, both at an engineering and purchasing level, to determine the resistor specification required for their project. This can take into account parameters including:

Resistor wattage
Resistor power rating
Mounting requirements. This could include vertical mounting or horizontal mounting or indeed a custom mounting requirement to enable ease of mounting the resistor assembly within the clients’ equipment.
Resistor termination. This could include solder terminals, quick connect terminals, ferrule mounting or a wide range of other options. […]

500 Watt Power Resistor – Selecting Wire Wound Resistors

16 February 2015. Continuing on with out wire wound resistor selection series, this week we take the example of a high power resistor – namely a 500 watt power resistor. In this example our application calls for a 500 watt rated resistor that has a 5 percent tolerance and 470 ohm adjustable resistance.

A 500 watt rated resistor, by its very power rating, calls for a rugged, highly reliable method of construction, with the ability to dissipate significant amounts of heat from the body of the resistor. From our wire wound resistor product selection guide, we can see that the Y Series […]

Wire Wound Resistor Selection

Selecting the correct wire wound resistor for your application is critical in insuring excellent long term reliability for your circuitry and equipment in which the power resistor is being used. Once you have determined the appropriate power rating for your application, by, for example, using ohms law, you can then select the type of resistor based on these parameters:

Physical size
Required method of mounting the resistor
Electrical pulse handling capability
Requirement of the resistor to be adjustable or fixed in value
Required tolerance of resistance
Mechanical construction of the resistor
Non Inductive winding

As you will see from the products page, we can offer a resistor that […]

January 13th, 2015|Power Resistor, Resistor Applications, Wire Wound Resistors|

Wire Wound Resistor Quality – Not All Resistors Are Equal

The market and applications for wire wound resistors, both globally and in Australia is very diverse. The majority of our range of wire wound resistors are manufactured for industry. Companies manufacturing electronic and electrical products generally have some, or all of the following requirements when specifying and sourcing appropriate wire wound resistors and power resistors for their products:

Reliability. More often than not the application for a wire wound resistor calls for a significant power handling capability in comparison with the rest of the appliances circuity. As power capacity of a component generally entails heat dissipation it is critical that the […]

November 4th, 2014|resistor manufacturer, resistor quality, Wire Wound Resistors|

50 Watt Rheostat

50 Watt Rheostat – High Power Rheostat Example
Rheostats have been used in industry for over 50 years. A rheostat has the electrical characteristics of being able to offer an adjustable resistance specified at time of ordering the rheostat and being able to dissipate significant power – 50 watts in the case of the APR50 rheostat. This is useful in applications such as:

motor control
lighting control
industrial controllers
sound level control
laboratory test setups

Rheostat Specification
Parameters used to specify a rheostat include the following:

Resistance tolerance – typically +- 10% in the case of the APR series rheostats.
Insulation Resistance – Typically 100M ohms at 500 volts d.c.
Rotational […]

October 3rd, 2014|Power Resistor, Resistor Applications, Wire Wound Resistors|

100 Watt Power Resistor Example

100 Watt Resistor Application And Specification
We had a recent enquiry for a power resistor that was to be used in the mining industry for a braking resistor for a conveyor belt system used in a coal loading terminal in Newcastle. The motor requiring the braking resistor was slightly unusual in that it was a d.c. (direct current) motor. The resistor required had the following requirements in its specification:

3.9 ohm resistance
Maximum current rating 4.5 amps (d.c.)

Using basic resistor theory we determined that the most appropriate power rating for the resistor would be found by using the formula Power (dissipated in the resistor) = […]

September 8th, 2014|Applications, Power Resistor, Resistor Applications, Wire Wound Resistors|