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Green aluminium chassis-mount wirewound resistor with screw holes, 53 x 27 x 15.5 mm

Unique-Bargains

Unique-Bargains 25W 3.3k Ohm Aluminium Chassis Mount Wirewound Resistor Green

SKU CH-8FRA-K6S22

A 25 W wirewound resistor with 3.3 kΩ resistance and an aluminium chassis-mount housing for heat dissipation

  • 25 W power rating handles demanding loads
  • 3 kΩ resistance with ±5 % tolerance
  • Aluminium housing dissipates heat efficiently
  • Chassis-mount design with 3.5 mm fixing hole
  • Compact 27 × 16 × 15.5 mm body fits tight spaces

Component Purpose

This 3.3 kOhm wirewound resistor handles 25 W in a compact aluminium housing. It suits engineers and technicians who need a chassis-mount power component for doorbell circuits, power supplies, transducers, elevators or professional audio equipment.

Thermals and Mounting

The aluminium casing measuring 27 x 16 x 15.5 mm transfers heat to a cooling plate, allowing continuous operation in harsh environments. Screw holes of 3.5 mm secure the 53 x 27 x 15.5 mm body firmly against vibration.

Upgrade Context

The part replaces lower-rated resistors that overheat or drift in high-power positions. The jump is justified when a design demands 25 W dissipation, non-inductive winding and reliable mounting without increasing board footprint.

How it compares

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

Price $5.99
Cheaper than about 70% of the 265 comparable items (median $9.99).

Specifications

Product
Brand nameUnique Bargains

Questions about this item

How do I mount the 3.5 mm holes on the aluminium chassis and what step is often missed?

Fasten the 3.5 mm mounting holes to a flat metal surface using screws and apply thermal paste between the 27 x 16 x 15.5 mm aluminium housing and the plate; the missed step is skipping the paste, which reduces the 25 W heat path.

What maintenance or replacement will this wirewound resistor need later?

No scheduled maintenance is required; if the green casing discolours, the ceramic core cracks or resistance drifts beyond the ±5 % tolerance after prolonged 25 W operation, replace the 15 g unit.

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

The aluminium housing reaches its thermal saturation point first; without adequate cooling plate contact the 27 x 16 x 15.5 mm body cannot shed heat fast enough, causing resistance drift beyond the 3.3 kΩ ±5 % spec.

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