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Three green aluminum chassis-mount wirewound resistors with rod terminals

Unique-Bargains

Unique-Bargains 25W 820 Ohm 5% Aluminum Housing Wirewound Resistor 3 Pcs

SKU CH-7F77-B9FE9

Three chassis-mount wirewound resistors rated 25 W, 820 Ω ±5 % with aluminium housings measuring 28 × 27 × 14 mm

  • Material\
  • Featurescool plate Chassis Mount Aluminum Housing resistors;high pow
  • 25 W power rating handles high-load circuits
  • 820 Ω resistance with 5 % tolerance ensures precise values
  • Aluminium chassis-mount case acts as integrated heatsink
  • 5 mm mounting holes on 18 mm centres simplify panel fixing
  • Pack of three identical resistors supports multi-point installations

25 W 820 Ω aluminium-cased wirewound resistor

This aluminium-housed wirewound resistor is rated at 25 watts with a nominal resistance of 820 ohms and a 5 percent tolerance. The unit measures 28 mm by 27 mm by 14 mm, extending to 50 mm overall including the terminal rods. A 3.5 mm mounting hole spaced 18 mm from the adjacent hole allows secure chassis fixing. Three pieces are supplied per pack.

Suits power-dissipation tasks needing a rugged

Engineers building dummy loads, braking circuits or current-limiting stages will appreciate the high-power aluminium case that doubles as a heatsink when bolted to a metal panel. Hobbyists working on low-voltage signal circuits or breadboard prototypes should choose a lower-wattage axial or surface-mount part instead, as this device runs very hot and requires firm mechanical mounting.

25 W continuous rating

The 25 watt rating is the single figure that decides fit: the supplier advises operating each resistor at only 50 percent of that rating and adding an external heatsink whenever the load approaches the upper end. Without adequate metal mounting and derating the case temperature will exceed safe limits.

Highlights

  • 25 W power rating handles high-load circuits
  • 820 Ω resistance with 5 % tolerance ensures precise values
  • Aluminium chassis-mount case acts as integrated heatsink
  • 5 mm mounting holes on 18 mm centres simplify panel fixing
  • Pack of three identical resistors supports multi-point installations

Specifications

BrandUnique Bargains
Material\
Featurescool plate Chassis Mount Aluminum Housing resistors;high power load aluminum Case resistor with hot sink;good performance in vibration Single Fix Resistors for ring reliability;ring doorbell Resistors;high quality Wirewound Resistor 820 Ω

Questions about this item

Will the aluminium housing and mounting hardware need periodic replacement under continuous 25 W load?

The aluminium case and nickel-alloy wire element are built for sustained 25 W operation; no scheduled replacement is required if the resistor is mounted on a metal surface with adequate heatsinking.

What thermal limit is reached first when the resistor runs at full 25 W for long periods?

The case temperature becomes the limiting factor; the supplier notes the housing gets extremely hot and recommends a 30–50 % power derating or added heatsink to keep the aluminium within safe limits.

How much audible noise or surface heat appears when the unit dissipates 25 W all day?

Wirewound construction is silent, but the aluminium housing converts electrical energy directly into heat and becomes too hot to touch; mounting on a metal plate and adding a heatsink are advised for continuous use.

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