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

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.