Resistors 25W Wirewound Tubular Adjustable and Mounting Hardware

Power rating 25W
Resistance range 1.8 Ohm – 18 kOhm
Resistance tolerance ±5%,  ±10%
Price Resistor APT 25W 1.8R - 100R $5.86
Resistor APT 25W 110R - 910R $5.65
Resistor APT 25W 1K - 18K $5.65
Dimensions D×L×H×d 20×50×35×13 mm
Weight 30 g

Wirewound adjustable (regulated, variable) high-power resistors of type APT (Adjustable Painted Tubular Resistors) series, dissipation power 25W, rated resistance from 1.8 Ohm to 18 kOhm. Similar series of resistors are RX20, RXG. Resistors are designed for using in AC and DC circuits, providing current limitation and voltage distribution. Resistors with a specific rated power can also be manufactured to individual order.

PDFDatasheet PDF for WireWound Tubular Adjustable Resistors.

PDFThe resistance values of resistors follow the E24 series.

Structurally, the resistor consists of a tubular ceramic core on which a constantan (low resistance resistor) or nichrome (high resistance resistor) wire is wound. Resistors are coated with heat-resistant and moisture-resistant insulating paint.

Resistor resistance is adjusted by changing the position of the moving clamping collar (movable contact) along the case (tube). The contact between the clamping collar and the wire coils of the resistor is provided by the unpainted side of the housing.

Contacts, resistor leads are rigid, tape type with screw holes or for soldering conductors. Kind of mounting is hinged. Mounting of resistors on the panel is provided by a set of fasteners. Resistance tolerance is ±5%, ±10%.

The maximum operating voltage at AC is 1000V, at DC – 1400V. Operating elevated ambient temperature does not exceed +155°C (at the same time the power is reduced to 60% of the nominal power), the limit temperature up to +250°C. The insulation resistance of wire resistors is at least 1000 MOhm. Working time – at least 15000 hours.

Using the calculator, it is convenient to calculate the total resistance when the resistors are connected in parallel or in series, and the resistor resistance in the circuit.

Comparative characteristics of wire tube resistors, cement resistors and resistors in aluminium housing are presented in the comparative table.

Detailed resistor specifications, overall and mounting dimensions, mounting kit, installation and operation recommendations are given on the page below.

Our company is engaged in the production and sale of wirewound tubular resistors. All our products pass strict quality control and meet the necessary standards. Since we are the manufacturer, and in the price of the final product does not include dealer markups, we have low price saddle packing.

The warranty period of the resistors 25W supplied by our company is 2 years. Documents confirming the quality of products are provided.

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The final price for 25W Wirewound Tubular Adjustable Variable Resistors depends on the quantity, delivery terms and form of payment.

For questions regarding the acquisition of WireWound Tubular Resistors 25W, send an email request to:

[email protected]

And we will provide you a commercial offer for delivery.
For a large number, we will provide an individual price!!!

We are open to manufacture products at our production facilities
according to your requests and technical task.


Range of nominals of Ceramic Wirewound Tubular Adjustable Variable Resistors 25 Watts:

1.8 Ohm – 39 Ohm 43 Ohm – 820 Ohm 910 Ohm – 18 kOhm
Nominal Price Nominal Price Nominal Price
APT 25W 1.8 Ohm $5.86
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APT 25W 43 Ohm $5.86
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APT 25W 910 Ohm $5.65
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APT 25W 2 Ohm $5.86
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APT 25W 47 Ohm $5.86
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APT 25W 1 kOhm $5.65
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APT 25W 2.2 Ohm $5.86
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APT 25W 50 Ohm $5.86
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APT 25W 1.1 kOhm $5.65
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APT 25W 2.4 Ohm $5.86
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APT 25W 51 Ohm $5.86
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APT 25W 1.2 kOhm $5.65
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APT 25W 2.7 Ohm $5.86
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APT 25W 56 Ohm $5.86
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APT 25W 1.3 kOhm $5.65
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APT 25W 3 Ohm $5.86
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APT 25W 62 Ohm $5.86
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APT 25W 1.5 kOhm $5.65
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APT 25W 3.3 Ohm $5.86
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APT 25W 68 Ohm $5.86
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APT 25W 1.6 kOhm $5.65
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APT 25W 3.6 Ohm $5.86
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APT 25W 75 Ohm $5.86
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APT 25W 1.8 kOhm $5.65
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APT 25W 3.9 Ohm $5.86
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APT 25W 82 Ohm $5.86
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APT 25W 2 kOhm $5.65
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APT 25W 4.3 Ohm $5.86
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APT 25W 91 Ohm $5.86
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APT 25W 2.2 kOhm $5.65
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APT 25W 4.7 Ohm $5.86
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APT 25W 100 Ohm $5.86
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APT 25W 2.4 kOhm $5.65
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APT 25W 5.0 Ohm $5.86
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APT 25W 110 Ohm $5.65
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APT 25W 2.7 kOhm $5.65
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APT 25W 5.1 Ohm $5.86
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APT 25W 120 Ohm $5.65
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APT 25W 3 kOhm $5.65
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APT 25W 5.6 Ohm $5.86
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APT 25W 130 Ohm $5.65
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APT 25W 3.3 kOhm $5.65
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APT 25W 6.2 Ohm $5.86
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APT 25W 150 Ohm $5.65
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APT 25W 3.6 kOhm $5.65
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APT 25W 6.8 Ohm $5.86
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APT 25W 160 Ohm $5.65
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APT 25W 3.9 kOhm $5.65
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APT 25W 7.5 Ohm $5.86
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APT 25W 180 Ohm $5.65
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APT 25W 4.3 kOhm $5.65
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APT 25W 8.2 Ohm $5.86
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APT 25W 200 Ohm $5.65
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APT 25W 4.7 kOhm $5.65
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APT 25W 9.1 Ohm $5.86
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APT 25W 220 Ohm $5.65
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APT 25W 5 kOhm $5.65
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APT 25W 10 Ohm $5.86
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APT 25W 240 Ohm $5.65
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APT 25W 5.1 kOhm $5.65
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APT 25W 11 Ohm $5.86
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APT 25W 270 Ohm $5.65
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APT 25W 5.6 kOhm $5.65
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APT 25W 12 Ohm $5.86
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APT 25W 300 Ohm $5.65
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APT 25W 6.2 kOhm $5.65
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APT 25W 13 Ohm $5.86
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APT 25W 330 Ohm $5.65
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APT 25W 6.8 kOhm $5.65
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APT 25W 15 Ohm $5.86
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APT 25W 360 Ohm $5.65
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APT 25W 7.5 kOhm $5.65
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APT 25W 16 Ohm $5.86
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APT 25W 390 Ohm $5.65
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APT 25W 8.2 kOhm $5.65
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APT 25W 18 Ohm $5.86
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APT 25W 430 Ohm $5.65
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APT 25W 9.1 kOhm $5.65
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APT 25W 20 Ohm $5.86
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APT 25W 470 Ohm $5.65
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APT 25W 10 kOhm $5.65
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APT 25W 22 Ohm $5.86
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APT 25W 500 Ohm $5.65
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APT 25W 11 kOhm $5.65
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APT 25W 24 Ohm $5.86
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APT 25W 510 Ohm $5.65
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APT 25W 12 kOhm $5.65
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APT 25W 27 Ohm $5.86
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APT 25W 560 Ohm $5.65
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APT 25W 13 kOhm $5.65
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APT 25W 30 Ohm $5.86
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APT 25W 620 Ohm $5.65
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APT 25W 15 kOhm $5.65
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APT 25W 33 Ohm $5.86
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APT 25W 680 Ohm $5.65
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APT 25W 16 kOhm $5.65
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APT 25W 36 Ohm $5.86
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APT 25W 750 Ohm $5.65
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APT 25W 18 kOhm $5.65
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APT 25W 39 Ohm $5.86
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APT 25W 820 Ohm $5.65
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Part Numbering Guide for Resistors 25W:

Resistor   APT   25W   100 Ohm   ±10%
Resistor Product Name.
APT Adjustable Painted Tubular Resistor Series.
25W Rated Power, Watts.
100 Ohm Nominal Resistance, Ohm.
±10% Tolerance.

Electrical and technical specifications of Wirewound Tubular Resistors 25W:

Power rating 25W
Resistance range 1.8 Ohm – 18 kOhm
Series of nominal resistance values E24, PDFDatasheet of resistance values
Resistance tolerance ± 5%, ± 10%
Rated voltage Vmax = (Pnom × Rnom)0.5
Maximum working voltage 1400V
Operating temperature -60°C ... +155°C
Raised ambient operating temperature 70ºC
Relative humidity at 35°C without condensation <98%
Temperature coefficient of resistance ±500 ppm/°C
Insultation resistance 1000 MOhm
Life time 15000 hours

Mounting Hardware for Wirewound Tubular Resistors

Mounting hardware are used for mounting the resistors. Resistors can be supplied with a set of mounting hardware, including mounting brackets (corners), which must be ordered individually.

drawing
Photo Series of mounting hardware and brackets Price Dimensions, mm Weight
Threaded rod Ceramic bushing Mounting brackets Size between resistor axis and panel Size between resistor and panel
L Ød1 ØD Ød AxAxB k h
Hardware 25W HDW 25W $0.86
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90 М5 20 11 25x25x15 20 10.5±1 24 g
Mounting Brackets 25W BR 25W (2 pcs.) $0.43
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17 g

Completeness of Mounting Hardware for Wirewound Tubular Resistors

Image Completeness of Mounting Hardware
Item 7.5, 10, 15 Watt 25, 50, 75, 100, 160 Watt
Threaded rod M5 1 pcs. 1 pcs.
Ceramic bushing - 2 pcs.
Screw-nut M5 2 pcs. 2 pcs.
Flat washer 2 pcs. 2 pcs.
Spring washer 2 pcs. 2 pcs.
Asbestos washer 2 pcs. 2 pcs.
Textolite washer 2 pcs. -
Brackets (Corners) - 2 pcs.

Installation methods of tube resistors

At influence of mechanical factors for resistors the hinged way of installation is applied. The resistors are fixed to the mounting plates by mounting hardware:

  • resistor power from 3 to 25 Watt – cantilever or on two brackets at the ends of the mounting studs
  • resistor power from 50 to 160 Watt – only on two brackets at the ends of the mounting studs
Resistor mounting

Overall and Mounting Dimensions of Wirewound Tubular Adjustable Resistors 25W:

Drawing of wirewound tubular resistor
L, mm L1, mm ØD, mm H, mm Ød, mm Ød1, mm B, mm A, mm
50 30 20 35 13 2 4.5 3.5

WireWound Tubular Ceramic Power Resistors by AS ENERGI

Our company is engaged in the manufacturer and sale of wirewound tubular resistors fixed and adjustable types.
You can buy resistors from us in any volumes, and when ordering large lots, the price will be lower.
We have earned the trust of customers and supply products all over the world.

To purchase WireWound Tubular Resistors, send an email request to:

[email protected]

And we will provide you a commercial offer for delivery.


Datasheet (pdf specification) for Wire Wound Tubular Adjustable Variable Resistors:

PDFDatasheet PDF for WireWound Tubular Adjustable High Power Resistors


Guide for using and operation of resistors:

  • Solder the wires to the resistor leads in specially designed holes.
  • When installing resistors in equipment recommended to use Sn40Pb60 solder. Soldering iron core temperature is 300°C. Soldering iron power is 65W. The flux should consist of 25% by weight of rosin and 75% by weight of isopropyl or ethyl alcohol. Soldering time 5 s.
  • The voltage that can be supplied to the resistor must not exceed the value calculated on the basis of the nominal (or allowable) power Pnom and nominal resistance Rnom according to the formula:
    Vmax = (Pnom × Rnom)0.5
  • Resonant frequency value - 1500 Hz.
  • 95-percent work resource - 30 000 hours.
  • It is allowed to operate resistors under the influence of gas media of this composition (without the formation of an explosive mixture):
    • nitrogen – up to 96%;
    • oxygen – up to 50%;
    • carbon dioxide – up to 3%;
    • hydrogen – up to 20%;
    • helium – up to 1%;
    • argon – up to 1,5%.
  • Operation of resistors during and after exposure to atmospheric pressure reduced to 10~5 mm Hg is allowed.
  • In electrical circuits with voltages above 500V resistors must be used with additional insulation at the mounting points.
  • When using resistors in equipment with vibration loads from 1 to 2500 Hz with an acceleration of 176.6 m/s2 (18g), the resistor leads must be soldered with a 0.5 mm2 wire cross-section with insulation by a polychlorovinyl tube Ø4 mm and length of 15-20 mm – for resistors 5-25 W, and Ø5 mm and length of 15-20 mm – for resistors 50-100 W.
  • Tensile force value should be 20N (2 kgf).
  • The upper frequency of the range in which there should be no resonant frequencies – 1000 Hz.
  • Maximum surface temperature of the resistor is not more than 250°C.

Graph of the resistor power reduction:

The load power should be reduced based on the derating curve once the ambient temperature exceeds the rated values.


Resistor Resistance Calculation


Resistor Connection Diagram


Comparative performance of high power resistors:

Resistor Series Type Structure Power, W Resistance Range, Ohm Maximum Voltage, V Resistance Tolerance
img FPT, RX20 Fixed Wire Tubular Ceramic 3 - 25W 1 R - 100 K ~1000V
=1400V
± 5%
± 10%
img APT, RX20 Adjustable, Regulated Wire Tubular Ceramic 3 - 25W 1 R - 100 K ~1000V
=1400V
± 5%
± 10%
img SQP, RX27, CR-L Fixed Wire Ceramic Cement 5 - 25W 0,01 R - 100 K ~1500V
=1000V
± 5%
img AH, HS, RX24 Fixed Wire Ceramic, Aluminum Case with Radiator 5 - 1000W 0,01 R - 100 K ~2500V
=2500V
± 5%

 

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