Power Resistors
Wire Wound Resistors
From 0.5 watt to megawatts; performance, durability and quality are the hallmarks of our resistors & load banks. We have specialized in manufacturing high accuracy wire-wound power resistors and resistive element ‘dummy’ loads for over 70 years.
WIRE WOUND RESISTORS
Wire Wound Resistors
Covering the gambit; fixed or variable type, NER or Continuous usage, single or multistage switching, weatherproof, fan-cooled, meters, transportable.
- Fan & Motor Speed Control
- VSD Braking Overloads
- Standby Power Generator Loading & Testing
- UPS & Battery Discharge Testing
- Regenerative & Braking Load Discharge
WIRE WOUND RESISTORS
Wirewound Resistors Australia – Hurtle Webster Range
Backer Cynebar Ohmic continues the trusted Hurtle Webster brand of wirewound resistors, supplying high-quality Ohmic Resistors, Wirewound Resistors and a comprehensive Standard Resistor Range for industrial, OEM, mining, rail, defence, power generation and appliance applications.
Our resistors are engineered for long-term reliability, excellent thermal stability, accurate resistance values and outstanding overload performance. Available on both round and oval ceramic formers, the Cynebar range offers one of Australia's broadest selections of industrial wirewound resistors.
WIRE WOUND RESISTORS
Why Choose Backer Cynebar Ohmic Wirewound Resistors?
Backer Cynebar Ohmic manufactures resistor assemblies designed to perform reliably in demanding industrial environments.
Key Benefits
- Wide standard resistance range
- Precision wirewound construction
- Excellent long-term stability
- High overload capability
- Tropic-proof moisture-resistant coating
- Low temperature coefficient resistance wire
- Australian engineering support
- Custom resistor manufacturing available
- Fixed or adjustable tapping bands
- OEM and replacement resistor solutions
WIRE WOUND RESISTORS
Premium Ceramic Former Construction
Our standard resistor range is wound on high-grade ceramic insulating formers, available in both:
Round Formers
- Compact design
- Broad resistance range
- Wattages from 3W to 1000W
Oval Formers
- High power dissipation
- Larger mounting footprint
- Wattages from 20W to 100W
Custom former shapes, lengths and materials can also be manufactured to customer specification. We regularly produce specialist resistor windings on fibreglass cores and other engineered insulating materials for OEM applications.
WIRE WOUND RESISTORS
Precision Resistance Wire Technology
Our wirewound resistors use premium resistance alloys with a temperature coefficient as low as 20 ppm/°C, ensuring excellent resistance stability throughout the operating temperature range.
Features include:
- Low resistance drift
- Excellent accuracy
- Stable operating characteristics
- Silver-soldered terminations
- High overload reliability
- Long service life
Special resistance alloys and custom temperature coefficients are available for engineered applications.
WIRE WOUND RESISTORS
Advanced Tropic-Proof Coating System
Our specially developed silicone resin coating provides protection against:
- Moisture
- Thermal cycling
- Corrosion
- Industrial contamination
- High operating temperatures
This coating system enables reliable performance in harsh Australian industrial environments.
Thermal Performance
| Feature | Performance |
|---|---|
| Rated Temperature Rise | 250°C above 20°C ambient |
| Continuous Surface Temperature | Up to 350°C |
| Moisture Resistance | Excellent |
| Electrical Insulation | Excellent |
| Thermal Cycling Resistance | High |
WIRE WOUND RESISTORS
Quality Control & Manufacturing Excellence
Every Backer Cynebar Ohmic resistor undergoes rigorous manufacturing controls, including:
- Precision winding at controlled tension
- Thermal stabilisation processes
- Controlled coating cycles
- Resistance verification
- Final inspection and testing
- Comprehensive quality assurance
This ensures repeatability, reliability and long service life across the complete resistor range.
WIRE WOUND RESISTORS
Standard Resistor Range
Our standard range covers round former (HTR) and oval former (HTF) wirewound resistors from 3W to 1000W.
Round Former Wirewound Resistors
| Type | Wattage | Resistance Range (Ω) |
|---|---|---|
| HTR 3 | 3W | 0.05 – 10,000 |
| HTR 5 | 5W | 0.05 – 25,000 |
| HTR 10 | 10W | 0.05 – 40,000 |
| HTR 20 | 20W | 0.05 – 40,000 |
| HTR 25 | 25W | 0.05 – 40,000 |
| HTR 30 | 30W | 0.05 – 50,000 |
| HTR 40 | 40W | 0.05 – 75,000 |
| HTR 50 | 50W | 0.05 – 80,000 |
| HTR 65 | 65W | 0.05 – 100,000 |
| HTR 75 | 70W | 0.05 – 100,000 |
| HTR 100 | 100W | 0.1 – 150,000 |
| HTR 150 | 150W | 0.1 – 200,000 |
| HTR 200 | 200W | 0.1 – 250,000 |
| HTR 250 | 250W | 0.1 – 250,000 |
| HTR 350 | 350W | 0.2 – 250,000 |
| HTR 500 | 500W | 0.2 – 250,000 |
| HTR 750 | 750W | 0.2 – 250,000 |
| HTR 1000 | 1000W | 0.2 – 250,000 |
Oval Former Wirewound Resistors
| Type | Wattage | Resistance Range (Ω) |
|---|---|---|
| HTF 20 | 20W | 0.1 – 30,000 |
| HTF 30 | 30W | 0.75 – 50,000 |
| HTF 40 | 40W | 1 – 60,000 |
| HTF 50 | 50W | 1 – 70,000 |
| HTF 65 | 65W | 1 – 80,000 |
| HTF 75 | 75W | 1 – 90,000 |
| HTF 100 | 100W | 1 – 100,000 |
WIRE WOUND RESISTORS
Standard Tolerances
Backer Cynebar Ohmic offers industry-leading resistor tolerances. For specialist applications, matched resistor assemblies and precision resistor networks can be supplied to customer requirements.
| Resistance Value | Standard Tolerance |
|---|---|
| Above 10Ω | ±5% |
| Below 10Ω | ±10% |
| Precision Options | Down to ±0.1% |
| Matched Sets | Available |
| Resistor Chains | Available |
| Custom Precision Products | Available |
WIRE WOUND RESISTORS
Stability Performance
Long-term stability is critical for industrial resistor applications.
Typical Stability
Better than 0.02% per 1,000 operating hours at maximum load and 70°C.
This exceptional stability makes Cynebar wirewound resistors suitable for:
- Instrumentation
- Control systems
- Test equipment
- Load simulation
- Industrial automation
- Defence systems
WIRE WOUND RESISTORS
Flexible Termination Options
Small Wattage Types
- Axial leads
- Types HTR 3, HTR 5 and HTR 10
Medium & High Wattage Types
- Solder lugs
- Fixed tapping bands
- Adjustable tapping bands
Custom Options
- Push-on connectors
- Brass ferrule ends
- Stud connections
- Bolt and nut terminations
- Special OEM terminations
WIRE WOUND RESISTORS
Mounting Options
Backer Cynebar Ohmic provides multiple mounting arrangements to simplify installation.
Horizontal Mounting Feet
Available for:
- Oval formers
- Round formers 14.5 mm diameter and larger
Heat Sink Mounting
Heat sink mounting systems are available for selected resistor sizes and can increase power dissipation capacity by up to 50% when mounted to suitable metal chassis surfaces.
Typical Mounting Heights
| Resistor Type | Mounting Height |
|---|---|
| HTR 20 to HTR 75 | 30 mm |
| HTR 65 to HTR 200 | 50 mm |
| HTR 350 | 80 mm |
| HTR 500 to HTR 1000 | 92 mm |
| All Oval Formers | 160 mm |
WIRE WOUND RESISTORS
Typical Applications
Backer Cynebar Ohmic wirewound resistors are used throughout Australia in:
- Electrical switchboards
- Motor control systems
- Load banks
- Dynamic braking systems
- Neutral earthing systems
- Railway applications
- Mining equipment
- Power generation facilities
- Test equipment
- Industrial automation
- OEM manufacturing
- Heating and control systems
WIRE WOUND RESISTORS
Why Backer Cynebar Ohmic?
Backer Cynebar Ohmic is an Australian manufacturer based in Brisbane, supplying high-performance resistor products throughout Australia and international markets.
Our capabilities include
- Wirewound Resistors
- Ohmic Resistors
- Hurtle Webster Resistor Replacements
- Standard Resistor Range
- Dynamic Braking Resistors
- Neutral Earthing Resistors
- Stainless Steel Grid Resistors
- OEM Custom Resistors
- High Power Resistor Assemblies
With local engineering support, custom manufacturing capability and ISO 9001:2015 certified quality systems, Backer Cynebar Ohmic delivers resistor solutions built for demanding industrial environments.
Interested in wire wound resistors?
Tell us about your application and our engineers will find the right solution.