Australian Resistors – Supplier of Wire Wound Resistors and Power Resistors

Slider Resistors In Laboratory Calibration

The use of slider resistors or ‘laboratory resistors” have been employed for over 50 years as a means of calibrating electrical and electronic devices. The can be configured in resistance bridge arrangements and provided the correct ratings are available, in high voltage test circuitry.

The single tube slider resistor range is often used in test laboratories where electrical and electronic components are required to be tested to ensure they meet Australian Standards. Examples of these are street lighting systems, traffic lights and transformers. Slider resistors provide for precision adjustment of resistance allowing accurate setup of voltage and current in test circuitry.

June 19th, 2015|Laboratory Resistor, Power Resistor, Slider Resistor|

100 Watt Power Resistor

There is a wide variety of applications calling for a 100 watt power resistor. By looking through the power resistor products page it is apparent that there are several options when selecting a power resistor that meets this rating. Here we take a look at all the available options:

Power Wire Wound Resistor Assembly. The HA tubular power resistor is a highly reliable and ‘tried and tested’ resistor assembly that has been manufactured for over 40 years. It is robust, moisture resistant, resists chipping and can withstand temperatures over 1000 C. It is available in an adjustable resistance and has many mounting […]

May 26th, 2015|Applications, Power Resistor, Resistor Applications, wirewound resistor selection|

Wire Wound Potentiometer – Audio Amplifier Application

Potentiometers have been used for over 70 years for applications where varying a resistance is necessary as part of an electronic circuit. Typically carbon based tracks were employed for many years but when power ratings of several watts are required then the use of a wire wound element is preferable as greater power dissipation is possible.

A local high specification audio amplifier manufacturer needed a high reliability wire wound potentiometer to act as a volume control in one of their amplifier designs. The potentiometer required a 2.2 watt rating and the AW potentiometer was deemed to be a suitable candidate as it […]

April 20th, 2015|Resistor Applications, wire wound potentiometer|

Precision Wire Wound Resistors

Wire Wound Resistors Requiring High Power And Precision
Certain applications in electrical or electronic design call for a combination of:

High power rating
Tight tolerance on the resistance winding
Wire wound construction

Obtaining all three of these requirements in a resistor calls for a unique type of resistor construction. The ASW series precision wire wound resistors have been used extensively for applications in industries ranging from power conversion, U.P.S. manufacture, lighting control, motor drive circuits (both a.c. and d.c.) and transportation.

With power ratings available in 1.5 watts, 3 watts, 6.5 watts, 8 watts and 11 watts these power resistors have an available tolerance as low […]

March 16th, 2015|Power Resistor, Precision Wire Wound Resistor, Resistor Applications|

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 […]

February 16th, 2015|500 Watt Power Resistor, Power Resistor, Wire Wound Resistors, wirewound resistor selection|

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|

200 Watt Power Resistor

200 watt rated power resistors are commonly used in industry in a wide range of applications including:

resistor load banks
dropping resistors in large power supplies
power conversion circuits
braking applications

Tubular power wire wound resistors are often considered to be the ‘standard’ in high power resistors as they offer a ‘tried and tested’ solution and offer high reliability and low cost. The HO Series power resistor is often used when a 200 watt rated resistor is required. This resistor specification includes:

200 watt rating
267 mm ceramic former length
29 mm ceramic former diameter or 33 mm when coated
Mounting feet centres are 292 mm
For the standard fixed power […]

August 11th, 2014|Power Resistor, Resistor Applications, Wire Wound Resistors, wirewound resistor selection|

Australian Resistors - Supplier Of Quality Wire Wound Resistors. Tel: 0428261110

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