Helvar TS300 dimmer teardown

Helvar TS300 light dimmer is designed to dim incandescent light bulbs that are powered from 220-230V 50Hz AC power source. It is designed to be installed to wall in place of light switch. This is an old device that might not have been sold for ages. Once this type of dimmer was quite common on Finland.

What is inside

Closeup

This dimmer seems to have a thermal fuse to cut out power if the device gets too hot. The first picture shows the technical data available and the second picture shows the normal position this component is installed. It looks like this thermal fuse reacts if the internal temperature inside the dimmer case exceeds 115 degrees Celsius (239 Fahrenheit). It is a sensible safety device to have in addition to the fuse.

The circuit looks pretty typical for phase controlled triac based light dimmer. I did not trace all the circuit details, bit the main parts look pretty normal. It looks like this dimmer design is quite close to this other light dimmer circuit designed by the same Finnish company that I have documented in my Light dimmer circuits document.

 

2018-04-29

The main difference are some component values and the fact that this smaller power dimmer has also thermal fuse in series with the mains fuse for extra protection.

7 Comments

  1. Tomi Engdahl says:

    Cheap eBay dimmer module vs compliant dimmer. (Schematics)
    https://www.youtube.com/watch?v=w71Qr1ygB_Y

    A look at two dimmer modules. One is a really cheap 1 $/£ eBay module and one is a better quality one as sold in the UK for home use. The main differences are in the component ratings and suppression of electrical noise.

    Reply
  2. Tomi Engdahl says:

    Old Light Dimmer Failure and Teardown
    https://www.youtube.com/watch?v=9xN34G8pso0

    I had to replace an old dimmer switch for one of our lights. The knob just turns and turns, so I though I’d tear it down and see what went wrong with it.

    Reply
  3. Tomi Engdahl says:

    Dimmer repair with cheap triac from China
    https://www.youtube.com/watch?v=jolFU5v9IHs

    Trying repair with chinese component.

    Reply
  4. Tomi Engdahl says:

    DIY light Dimmer for video 1000 Watt ( WITH EPIC FAIL! )
    https://www.youtube.com/watch?v=kgBkG-1LVtQ

    Reply
  5. Tomi Engdahl says:

    Plug In Dimmer Adaptors, 300 watts
    https://www.youtube.com/watch?v=CLTCD0qaahg

    A look inside a dimmer plug adaptor for use with portable lighting such as table lamps.

    Reply
  6. Tomi Engdahl says:

    Dimmers and Lamps – LED, Incandescent, CFL
    https://www.youtube.com/watch?v=qoQ7wpVHr8I

    The plug in 300W dimmer with various different lamps. Plus another dimmer, minimum load requirements and power consumption of various LED lamps.

    Reply

Leave a Comment

Your email address will not be published. Required fields are marked *

*

*