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Five green aluminium chassis-mount wirewound resistors with screw holes

Unique-Bargains

Unique-Bargains 25W 30 Ohm Aluminium Chassis Mount Wirewound Resistors Green 5pcs

SKU CH-9D44-R7WR8

Five 30 Ω 25 W wirewound resistors with aluminium chassis-mount housings for heat dissipation

  • High 25W power handling for demanding circuits
  • Aluminium housing draws heat away from the core
  • Chassis-mount design with 3.5mm screw holes
  • Tight ±5% tolerance keeps resistance stable
  • Pack of five identical 30 Ohm resistors

25W 30 Ohm wirewound resistors

These chassis-mount wirewound resistors are rated at 25 W and 30 Ω with a ±5 % tolerance. The aluminium housing measures 27 x 16 x 15.5 mm and includes a 3.5 mm mounting hole for screw fixing to a cooling plate. A pack contains five green units weighing 69 g in total.

Upgrade from lower-power axial parts

They replace smaller axial or film resistors when continuous dissipation exceeds what those types can handle without forced air. The aluminium case transfers heat directly to a chassis, making the jump worthwhile for circuits that run at high average power in confined spaces.

Suits power-supply and industrial builders

Designers of power supplies, transducer circuits, elevator controls or arena audio equipment will find the non-inductive winding and vibration resistance useful. Buyers who need surface-mount components, higher resistance values or a different power rating should look at other parts.

How it compares

Measured against everything we stock in Passive Components & Solder Supplies, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 55% of the 265 comparable items (median $9.99).

Specifications

Product
Brand nameUnique Bargains

Questions about this item

What screw-hole diameter do I need to mount these chassis-mount resistors?

Each resistor has a mounted hole size of 3.5 mm (0.14 inch) for chassis mounting with screws.

How do I attach the 25 W wirewound resistors to a cooling plate, and what step is often missed?

Fasten the aluminium housing to the plate using the 3.5 mm mounting hole; the step often missed is applying thermal paste between the housing and the plate for proper heat transfer.

When should I replace the 30 Ω aluminium-housed resistors in a high-vibration environment?

Replace them if the resistance drifts outside the ±5 % tolerance, the green casing shows cracks, or the housing becomes loose from vibration stress.

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