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Two green aluminium chassis-mount wirewound resistors, rectangular with mounting holes

Unique-Bargains

Unique-Bargains 25W 470 Ohm Aluminium Chassis Mount Wirewound Resistors Green 2pcs

SKU CH-X0ZB-FRWK3

Two 25 W 470 Ω wirewound resistors in aluminium chassis-mount housings for heat dissipation

  • Key featuresCool plate Chassis Mount Aluminum Housing resistor;high powe
  • Rated 25 W for demanding power circuits
  • 470 Ω ± 5 % precision wirewound element
  • Aluminium chassis mount body dissipates heat efficiently
  • Vibration-resistant construction suits harsh environments
  • Two-piece pack provides spares or parallel builds

25 W 470 Ω Wirewound Resistors

These aluminium-housed wirewound resistors are rated at 470 Ω with a 5 % tolerance and a 25 W power rating. They are supplied as a pair of new components for chassis-mount installation in power circuits, doorbell systems, transducers and similar equipment.

Chassis-mount thermal limits

The aluminium housing measures 53 x 27 x 15.5 mm overall with a 3.5 mm mounting hole, allowing direct attachment to a cooling plate. Without that mechanical thermal path the 25 W rating cannot be sustained, so the installer must provide adequate metal-to-metal contact.

470 Ω resistance value

The single specification that determines fit is the 470 Ω nominal resistance; any circuit requiring a different ohmic value cannot use these parts. Builders needing other resistance values must source alternative resistors.

How it compares

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

Price $6.99
Cheaper than about 65% of the 265 comparable items (median $9.99).

Specifications

Product
Brand nameUnique Bargains

Questions about this item

How do I decide between the 25 W 470 Ω model and other power ratings?

Choose this 25 W 470 Ω version when your circuit needs that exact resistance and can dissipate up to 25 watts; lower-wattage parts will overheat, while higher-wattage units are larger and cost more.

What does the 25 W rating mean once the resistor is mounted in my enclosure?

The 25 W rating is achievable only when the aluminium housing is firmly screwed to a metal plate or heatsink; in free air the safe continuous power drops considerably.

How does the chassis-mount interface limit thermal performance?

Heat must flow through the 3.5 mm mounting holes into your chassis, so the thermal resistance of that joint caps the real-world power you can run continuously.

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