40 Watt Dimmable Transformer for LED Strip Lights
40 Watt Dimmable Transformer - open terminals for wiring


Product Video

TRIAC transformer & dimmerSetting up your TRIAC transformer

Wiring Diagram

40w Triac Dimmable Transformer Wiring Diagram

40 Watt Dimmable Transformer

Internal, Constant Voltage
Commercial Grade

Availability: In Stock for next day delivery

30 Watt Dimmable Transformer Datasheet PDF

InStyle LED’s 40 watt TRIAC dimmable transformer is a reliable commercial-grade LED power supply, available in 12v or 24v models with no minimum load. Fully enclosed, it can be installed in confined spaces and most other locations, and it produces minimal heat output – so it’s safe to touch.

TRIAC (TRIode for AC) power supplies, also know as phase dimmers or phase-cut dimming transformers, are an easy way to give your LEDs dimming functionality. Wired between your LEDs and your controller, they take in mains 240v power and manage the power output, eliminating the need for an LED receiver. To learn more about TRIAC dimming, please see our LED dimming support page.

This power supply can drive any of our LED strip lights and other lighting products, up to a maximum of 40w (make sure your LED voltage is the same as the voltage of the transformer). It can be dimmed using many standard household rotary dimmer switches (we recommend Aurora’s AU-DSP400X dimmer module and Varilight’s V-Pro series), and it’s also compatible with Lutron, Rako, Crestron and similar lighting control systems.

Input voltage: 100-240v AC. Output voltage: 12v or 24v (2 models). This item is RoHS compliant and conforms to all UK safety standards.

Our products are all covered by a 2-year ‘back to manufacturer’ warranty. See our warranty support page for full details. For more information, prices or to order please call 0116 2799 083 or email sales@instyleled.co.uk

This item is in stock.  Orders received before 3.30pm are dispatched the same day.


InStyle LED uses APC overnight as our delivery courier. Standard next day delivery is anytime between 8am and 4pm. When ordering you can upgrade to a pre-12, 10 or 9am delivery if you wish. We can also send goods directly to site, please just ask.

  • Commercial Grade Transformer
  • Ideal for internal use
  • Compatible with Lutron, Rako, Crestron and other lighting control systems
  • Product Codes: TR-40-12 (12 volt) / TR-40-24 (24 volt)

Product40 Watt Driver
Wattage Output:40 Watts
Voltage Output:12 or 24 Volts
Amp Output:3.3A (12V) or 1.6A (24V)
Voltage Input:100-240V~
Amp Input:1.0A (50/60Hz)
IP Rating:IP22
Warranty:2 Years
CE + RoHS Certificated:Yes


Product Codes: TR-40-12 (12 volt) / TR-40-24 (24 volt)

ProductMax Length of LED Tape
5 Watt LED Tape8 Meters
7.5 Watt LED Tape5 Meters
10 Watt LED Tape4 Meters
15 Watt LED Tape2.5 Metres
20 Watt LED Tape2 Metres

Premium-brand customers supplied by InStyle LED


You may also be interested in the following product(s)


30W Dimmable Transformer

The 30-watt dimmable transformer from InStyle is a high-quality LED power supply, available in 12V or 24V versions with no minimum load. Because it’s a TRIAC (phase dimming) unit, it can be controlled via mains 240V dimming – using many standard household rotary dimmer switches.


75W Dimmable Transformer

This 75-watt TRIAC transformer is a mains dimmable power supply, offering 0-100% smooth dimming. The slimline unit is available in 12V or 24V versions, and can be wired directly to a standard rotary dimmer switch (such as Aurora’s AU-DSP400X module or Varilight’s V-Pro series).

150 Watt Dimmable Transformer for LED Strip Lights

150W Dimmable Transformer

Our TRIAC 150-watt transformer is a high-quality dimmable power supply – easy to install and compatible with Lutron, Rako, Crestron and similar lighting control systems. Input voltage 100-240V AC; Output voltage 12V or 24V (choose from two separate models).

200 Watt Dimmable Transformer for LED Strip Lights

200W IP67-rated Dimmable Transformer

A high-quality water-resistant power supply, InStyle’s 200-watt IP67-rated transformer is TRIAC-dimmable – driven by a standard mains 240v power supply, it can be controlled using many standard rotary dimmer switches. Very reliable, with a slimline design and mountable brackets for easy installation.

Dimmable 40W Transformer Customer Reviews