• New South Wales:
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Ohmic Controls

Wire Wound Resistors

 

standard resistor brand

STANDARD RESISTOR™ Brand resistors are used throughout Australia and Overseas for accurate, safe and long-term control in electrical power and motor systems.

wirewound

As specialized designers and manufacturers of high power and accuracy resistors, we are there to safeguard a very wide range of power, motor and distribution systems in railways telecommunications, laboratories and major lift / elevator companies.

Standard Resistor brand consists of a wide range of wire wound resistors from 5 Watts to 1000 Watts to suit your needs as a fixed resistor or adjustable resistor.

As specialized designers and manufacturers of high power and accuracy resistors, we are there to safeguard a very wide range of power, motor and distribution systems in railways telecommunications, laboratories and major lift / elevator companies.

Standard Resistor brand consists of a wide range of wire wound resistors from 5 Watts to 1000 Watts to suit your needs as a fixed resistor or adjustable resistor.
 

Standard Resistor Brand Features :

 

    1. V-Type Vitreous enamel coating providing the ultimate protection against high humidity, environment attack and mechanical damage.
        • Withstand frequent start-stop cycles of motor starting and dynamic braking as the Vitreous coating also has a very high thermal mass and heat transfer rates thus absorbing heat of transient overloads.
        • Continuous operation at 350°C is possible using Vitreous enamel coating if designers wish to use smaller resistors for a given load.

• Terminal lugs avoid the effects of bending strains as the resistance element is silver soldered to the terminal lug band at a point remote from the terminal lug projection. This is the only proven reliable technique and is used on all Standard Resistor Brand products. Terminal Lugs are also suitable for soldering or bolt connection.

    1. “COOLFIN”: range are designed for equipment requiring low resistance ohmic values and high current capacity.
  • • “COOLFIN” ribbed construction aids in rapid cooling and especially constructed for motor starting and VSD Braking overloads. These are designed for equipment requiring low resistance ohmic values and high current capacity.

    1. “Adjustable resistors” provide good electrical contact with a silver contact type clip.
  •  

    • D Type coating offers a non-brittle, impervious encapsulation based on the most recent advances in silicone resins, with high-density ceramic filler providing maximum insulation and heat transfer properties

 

Table 1- Wire Wound Tubular Resistors: 5 to 250 Watt

 

Type

Wattage

Resistor Former Dimensions (mm)

Resistance Range

Mounting Centres (mm)

250 °C “D” or “V” Coating

350 °C “V” Coating

Diameter

Length

Minimum Ohms

Maximum Ohms Fixed

Maximum Ohms Adjustable

AA

5 Only “D” 8 22 0.5 5k Fixed Only N/A

AB

10 Only “V” 8 45 0.5 12k

DG

20 20 14 51 1 25k 5k 70

DH

25 25 14 64 1 30k 6k 86

DJ

30 30 14 76 1.5 40k 8k 95

EN

40 50 19 90 3 67k 13k 114

EP

50 75 19 114 3 90k 20k 140

ES

75 100 19 165 5 130k 25k 190

HX

50 75 29 83 4 85k 16k 120

HY

65 90 29 114 4 120k 23k 152

HA

100 150 29 165 5 200k 37k 203

HE

150 200 29 216 5 270k 51k 254

HO

200 250 29 267 5 350k 65k 305

Note 1

Note 2

Note 1

Note 3

Note 4

 

Notes:

  1. First letter relates to resistor former diameter – actual wire wound diameter is greater by varying amount due to resistor wire size and coat thickness. Second letter relates to resistor former length which is constant.
  2. First Column gives normal commercial rating for a surface temperature of 250°C in 20°C ambient. The second column ratings are for “V” coating.
  3. The range of resistance values are recommended limits – other sizes    may be made but at increased cost and possibly reduced reliability.
  4. Mountings. Types AA and AB are self-supporting on radial wire leads or solder lugs. The larger sizes are normally supplied with horizontal mounting feet. Vertical mountings with thru rod and dished washers are available on request.
  5. Tolerances. ± 5% above 50 Ω, ± 10% below are standard. ±1% available at increased cost.
  6. Tapped Resistors can be supplied to detail.

 

Table 2- “COOLFIN” Resistors: 75 to 550 Watt

 

Type

Full Watts Rating

Resistor Former Dimensions (mm)

Resistance Values In Ohms

Maximum no of Taps

Diameter

Length

Approximate Wound Diameter

Minimum

Maximum

CEA

75 19 90 25 0.04 6.0 1

CEB

110 19 114 25 0.04 9.0 2

CEC

125 19 127 25 0.05 10.0 2

CED

160 19 165 25 0.06 15.0 3

CFA

120 24 102 30 0.05 9.0 2

CFB

145 24 127 30 0.06 13.0 2

CFC

175 24 152 30 0.05 16.0 3

CFD

235 24 203 30 0.08 24.0 5

CHA

155 29 114 35 0.05 12.0 2

CHB

225 29 156 35 0.08 18.0 3

CHC

240 29 165 35 0.09 22.0 3

CHD

300 29 216 35 0.11 33.0 5

CHE

375 29 267 35 0.15 40.0 5

CHF

420 29 300 35 0.20 50.0 5

CIA

400 41 216 48 0.20 45.0 5

CIB

500 41 267 48 0.26 57.0 5

CIC

550 41 300 48 0.30 66.0 5

 

Resistance Tolerance:

    •  Above 0.5 Ohm +10%
    •  Below 0.5 Ohm + 15%
    •  All tapped units + 15 %
    •  Variability : Adjustable bands available

The Standard Resistor brand name will continue to offer quality and a wide range of wire and tape wound devices of proven reliability. Rest assured that we can supply just about any need, from hobby Slot Car resistors, to replacement parts for Scientific Instruments or even Complex designs for Dynamic Braking applications.

Ohmic Resistors remains committed to handling urgent delivery schedules, offering a quality range of wire wound resistors of proven reliability – so contact us now on +61 2 9820 5055 to discuss your needs.