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Small black box with rotary knob, four 3-pin fan headers, Molex plug, 5.5×2.1 mm DC jack

EN-Labs

EN-Labs TX3CO4D 4-Channel Fan Speed Controller, Molex to 4×3-pin, 5.5×2.1 mm DC port

SKU CH-WKTZ-TZ2YD

A four-channel fan hub powers up to four 3-pin or 4-pin fans from a single Molex connector and adjusts all speeds together via a front-mounted knob from off to 100 percent.

  • First connectorMolex 4pin
  • Second connector4 x TX3 3pin fan header
  • Connector count5
  • Product typeFan speed controller
  • DetailsType - 4 Channel Fan Speed Controller Fan quantity controlle
  • Key featuresEn-Labs TX3CO4D 3pin fan speed controller is suitable for 12
  • Controls four fans from one knob for balanced airflow
  • Stepless voltage adjustment from 0% to 100% speed
  • Molex power input keeps motherboard headers free
  • Extra 5.5×2.1 mm DC port accepts router-style 12 V adapter
  • Supports both 3-pin and 4-pin fans on every channel

4-Channel Fan Speed Controller

The EN-Labs TX3CO4D connects to a Molex power lead and provides four 3-pin headers for case, CPU, GPU or server fans. A single rotary knob adjusts the voltage supplied to every connected fan at once, from fully off up to 100 % speed. It is designed for 12 V three- or four-pin fans that accept voltage control rather than PWM signalling.

Installation and common issues

Plug the Molex connector into a spare power-supply lead, attach up to four fans to the 3-pin ports, and turn the knob to set the desired speed. All channels change together, so individual fan curves are not possible. Four-pin fans will run in voltage mode only; the PWM wire is not driven. The extra 5.5×2.1 mm DC jack accepts a 12 V adapter such as a router supply, but the unit draws a maximum of 1.5 A at 2 V across all channels combined.

Compatibility checks

Verify that your fans are rated for 12 V operation and that voltage regulation is acceptable for your cooling needs. Ensure the power supply has a free Molex connector and that total fan current will not exceed the 1.5 A limit. If you require per-fan PWM control or independent speed profiles, this controller will not meet those requirements.

How it compares

Measured against everything we stock in Internal PSU & Riser Cables, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 91% of the 7,839 comparable items (median $14.99).

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Specifications

Product
Brand nameEN-Labs
Model nameTX3CO4D
Product typeFan speed controller
Ports & slots
First connectorMolex 4pin
Second connector4 x TX3 3pin fan header
Connector count5

Questions about this item

How do I confirm the controller is regulating fan speed correctly after connecting it?

Turn the knob and observe all four connected fans changing speed together from off up to 100 % simultaneously.

What comes in the box and what must I provide separately?

The unit includes the Molex-to-4×3-pin hub with the 5.5×2.1 mm DC port; you must supply a Molex power lead from the PSU and up to four 3-pin or 4-pin fans.

Which version of this controller should I choose for a 12 V fan setup?

The TX3CO4D model is built for 12 V fans and handles up to 1.5 A per channel via the Molex or the 5.5×2.1 mm DC input.

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