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Gold aluminum housed wirewound resistor with screw tabs, 2.6 by 1.5cm body

Unique-Bargains

Unique-Bargains 25W 3.9 Ohm 5% Wirewound Resistor Aluminum Housed

SKU CH-88DF-BZ3TB

A 25 W wire-wound resistor rated at 3.9 Ω with 5 % tolerance, housed in a 5.5 × 2 cm aluminium body weighing 14 g for heat-sink mounting

  • Featuresscrew tabs;thermal insulation;small size;extensive resistanc
  • 25 W power rating handles demanding circuits
  • 9 Ω resistance with 5 % tolerance for precise control
  • Aluminum housing dissipates heat and suits cooling-plate mounting
  • Compact 2.6 × 1.5 cm body fits tight spaces
  • Screw-tab terminals give secure, vibration-resistant connections

25 W 3.9 Ω Wirewound Resistor

The aluminum-housed wirewound resistor is rated for 25 W continuous dissipation at 3.9 Ω with a 5 % tolerance. It suits engineers and technicians building or repairing power supplies, transducer circuits, elevator controls and arena audio systems that demand stable performance in harsh environments.

Aluminum housing for heat dissipation

The gold-tone aluminum body measures 2.6 x 1.5 cm and provides thermal insulation so the part can be mounted directly on a cooling plate. In normal operation the housing transfers heat away from the winding, keeping temperature rise low without forced airflow and allowing reliable service in atrocious ambient conditions.

Screw-tab terminals and compact footprint

Total dimensions are 5.5 x 2 cm including the screw tabs, which simplify secure wiring in vibration-prone installations. The 14 g unit fits tight chassis spaces, yet the tab layout leaves enough clearance for ring terminals or fork connectors during field maintenance.

Highlights

  • 25 W power rating handles demanding circuits
  • 9 Ω resistance with 5 % tolerance for precise control
  • Aluminum housing dissipates heat and suits cooling-plate mounting
  • Compact 2.6 × 1.5 cm body fits tight spaces
  • Screw-tab terminals give secure, vibration-resistant connections

Specifications

BrandUnique Bargains
Featuresscrew tabs;thermal insulation;small size;extensive resistance;transducer elevator

Questions about this item

How do I mount the 25W aluminum-housed resistor to a cooling plate, and what step is often missed?

Bolt the resistor through its screw tabs directly onto a flat, clean cooling plate; the step often missed is applying thermal compound between the aluminum housing and the plate to ensure full contact and proper heat flow.

What maintenance or replacement will the 3.9 Ohm 5% wirewound resistor need over time?

Periodically check that the screw tabs remain tight and the aluminum housing is free of corrosion or dust buildup; replace the unit if resistance drifts beyond the 5% tolerance or the housing shows physical damage.

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

The aluminum housing temperature rises until it reaches its maximum safe operating point; adequate cooling-plate contact and airflow must keep the body within its rated thermal limit.

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