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Two green aluminium chassis-mount wirewound resistors with mounting holes

Unique-Bargains

Unique-Bargains 50W 3.9 Ohm Chassis Mount Wirewound Resistor Green 2pcs

SKU CH-4J16-C2JSY

Two chassis-mount wirewound resistors rated 3.9 ohm and 50 W with aluminium housings for heat dissipation

  • Featurescool plate Chassis Mount Aluminum Housing resistor;high powe
  • 50 W power rating handles demanding circuits
  • 9 Ω ±5 % tolerance ensures precise resistance
  • Aluminium housing dissipates heat for stable operation
  • Chassis-mount design with 3.5 mm holes simplifies installation
  • Two resistors per pack support dual-channel builds

Two 50 W 3.9 Ω aluminium-housed resistors

This pack contains two wirewound power resistors rated at 3.9 ohms with a 5 % tolerance. Each unit is built into a green aluminium housing that acts as a heatsink and is designed for chassis mounting via a 3.5 mm screw hole. They are sold new as passive components for industrial and repair use.

Chassis mount limits heat dissipation

The aluminium case measures 49.5 x 27 x 15.5 mm without the mounting tabs and 73.5 x 27 x 15.5 mm overall. Rated power of 50 W is only achieved when the resistor is firmly bolted to a metal panel or cooling plate that can conduct heat away; free-air operation will reduce the safe load considerably.

Check mounting hole spacing

You need a flat metal surface with a 3.5 mm clearance hole for each resistor and enough area to accommodate the 73.5 mm total length. Verify that your equipment can provide the thermal path the aluminium housing requires and that the 3.9 Ω value matches the circuit design.

Highlights

  • 50 W power rating handles demanding circuits
  • 9 Ω ±5 % tolerance ensures precise resistance
  • Aluminium housing dissipates heat for stable operation
  • Chassis-mount design with 3.5 mm holes simplifies installation
  • Two resistors per pack support dual-channel builds

Specifications

BrandUnique Bargains
Featurescool plate Chassis Mount Aluminum Housing resistor;high power load aluminum Case resistor;good performance in vibration Single Fix Resistors;ring doorbell Resistors;high quality Wirewound Resistor

Questions about this item

Should I pick the 3.9 ohm version or a different resistance value?

This listing supplies the 3.9 ohm model with a 5 percent tolerance; if your circuit calls for a different resistance you will need another part.

What does the 50 watt rating mean once the resistor is mounted in my equipment?

The 50 W rating is the continuous power the wirewound element can dissipate when the aluminium housing is firmly screwed to a metal chassis that acts as a heatsink.

The chassis-mount screw holes are 3.5 mm — what does that cap in practice?

The 3.5 mm mounting holes accept M3 screws and limit the mechanical fixing to a single-bolt chassis attachment per resistor.

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