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TUBULAR POWER WIRE WOUND RESISTOR

TUBULAR POWER WIRE WOUND RESISTOR

...with the exclusive PYROSIL D Coat or SILICONE C Coat for the ultimate in protection against high humidity.


A complete range of power Wire Wound Resistors from 3 watts to 1500 watts is available with the exclusive PYROSIL D Coating. Proven after extensive field testing to provide long, trouble free performance under most operating conditions, PYROSIL coating offers the following features:
* Low temperature cured - no limitations on wire specifications.
* Repels moisture - minimises the effect of high humidity conditions.
* Resists chipping - for mechanical robustness.
* Unaffected by most common solvents - for resistance to environmental attack.
* Withstands temperatures over 10000C - resistor can absorb a short time overload of 5 times rated load.

COATINGS
PYROSIL D COAT  is a unique combination of silicone resins and refactory oxidation barriers designed particularly for high temperature operation. It is capable of withstanding temperatures corresponding to five times rated load.
TROPICAL C COAT is a specially developed silicone coat for the worst conditions encountered, such as on shipboard, in tropical countries and humid climates. Power rating in watts shown in the table should not be exceeded for full protection against moisture over the lifetime of the resistor.

TOLERANCES
Standard tolerance 5% 50 ohms and above, 10% below. Tolerances as low as 1.0% can be supplied. Further details on application.

ADJUSTABLE RESISTORS
Adjustable resistors are available within the maximum resistance range for each type, as shown in the table.

TAPPED RESISTORS
Tapped resistors may be supplied within the limitaions of the resistor size used. The use of a tap results in a small reduction in power rating and resistance available, since winding space is lost..

Tubular Power Wire Wound Resistor Average Temperature
Tubular Power Wire Wound Resistor Ambient Temperature
Tubular Power Wire Wound Resistor Numbers, Dimensions and Ranges

Note: Please contact Sales Staff for details of wattage ratings not listed.
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POWER RATINGS
The power ratings for Pyrosil "D" and Tropical "C" coatings are based on the ability of the resistor to give long service at a full rated load, at the nominated ambients. At higher ambients, the resistor should be derated in accordance with the de-rating curve.

Full rated load for a Pyrosil "D" coated resistor is based on a temperature rise of 250C from an ambient of 40C. Full rated load for Tropical "C" coated resistor is based on a temperature rise of 150C, from an ambient of 40C.

HIGH VOLTAGE OPERATION
Wire wound resistors may be supplied on special request for operation at 2kV or higher, by special positioning of end terminals (where some reduction in wattage may be tolerated) or the addition of mica or ceramic insulators. Consult our sales staff for further details.

RESISTANCE RANGE
Although maximum and minimum resistance values have been tabulated against each type, these are intended to indicate standard ranges only. Higher and lower values may be available on request.

Tubular Power Wire Wound Resistor Specifications

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