Tronic Fan Dimmer Switch, 500W, AC 250V, Bakelite

Our review

This is a rotary-style dimmer from Tronic, rated at 500W and designed for lights that are already dimmable. It works by raising and lowering the voltage supplied to the fitting, so it is not a universal controller for every lamp in a house. The square faceplate measures 90mm by 90mm and the body is made of Bakelite, an older thermoset material that stays rigid around heat. It comes assembled and is offered in black, gold, grey and white, which helps when matching existing switches on a wall.
It suits someone replacing a failed dimmer on a circuit of dimmable bulbs, or adding dimming to a room where the fixtures are confirmed compatible. Before buying, check three things: that your lamps are marked dimmable, that the total wattage on the circuit stays within the 500W rating, and that your wall box and wiring suit a 90mm square plate. Also confirm the colour against your other switches, since the four options are the only ones listed.
Compared with basic on-off switches, this gives variable light output rather than fixed brightness. Compared with dimmers sold for LED-only loads, it is a straightforward voltage-reduction type, so pairing it with the right bulbs matters more than the switch itself. The listing gives no details on minimum load, so if your setup uses very low-wattage lamps, ask the seller on Sokonia before ordering. A one-year warranty is stated, but keep the receipt and check how claims are handled.