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Five green aluminium chassis-mount wirewound resistors, rectangular finned bodies with mounting holes

Unique-Bargains

Unique-Bargains 390 Ohm 25W Aluminium Chassis Mount Wirewound Resistor Green 5pcs

SKU CH-7C9G-ESRF7

Pack of five 390 Ω 25 W wirewound resistors with aluminium chassis-mount housings for heat dissipation

  • Aluminium housing dissipates heat efficiently for chassis-mount cooling
  • 390 Ω ±5 % tolerance ensures precise resistance control
  • 25 W power rating handles high-load applications reliably
  • Chassis-mount screw holes simplify secure panel installation
  • Pack of five identical resistors supports multi-point designs

390 Ohm 25W wirewound resistors for chassis mounting

This pack contains five aluminium-housed wirewound resistors rated at 390 ohms with a 5% tolerance and a 25W power rating. They are designed for chassis mounting using screws and suit applications such as power supplies, transducers, elevator systems and audio equipment. The aluminium casing provides a path for heat to move into a mounting surface.

Thermals and power handling in normal use

Each resistor body measures 27 x 16 x 15.5 mm and the total length including terminals is 53 mm. The aluminium housing is intended to conduct heat away from the wirewound element into a chassis or cooling plate. At the rated 25W the component relies on that mechanical thermal path; without adequate mounting the case temperature will rise quickly.

Included hardware and mounting details

The package supplies five resistors only; no brackets, thermal compound or wiring are included. Mounting holes are 3.5 mm in diameter, spaced for direct screw fixing to a metal panel. The green anodised finish identifies the 390 ohm value but does not change the electrical or thermal characteristics.

Highlights

  • Aluminium housing dissipates heat efficiently for chassis-mount cooling
  • 390 Ω ±5 % tolerance ensures precise resistance control
  • 25 W power rating handles high-load applications reliably
  • Chassis-mount screw holes simplify secure panel installation
  • Pack of five identical resistors supports multi-point designs

Specifications

BrandUnique Bargains

Questions about this item

How do I mount the 3.5 mm chassis holes and what step do people miss?

Fasten each resistor through its 3.5 mm mounting hole to a flat metal plate using screws and thermal paste; the step often missed is applying the paste so the aluminium housing can transfer its 25 W rating into the plate.

What maintenance or replacement will these 390 ohm 25 W wirewound units need later?

They have no moving parts; inspect the screw torque and the green aluminium casing for corrosion or cracked ceramic insulation after long service, and replace any unit whose resistance drifts outside the ±5 % tolerance.

What limit appears first when the resistor runs at 25 W continuously?

The aluminium housing temperature rises until the chassis plate can no longer draw heat away; if the plate or airflow is inadequate, the resistor body exceeds its safe operating temperature before the wire element itself fails.

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