Lighting Transformers

Lighting transformers are, just as the name implies, transformers that are specifically utilized to work with lighting. They are typically referred to as dimmer switches. By using the ability of a transformer to alter the voltage going through a circuit, a light can be made brighter or dimmer. Lighting transformers are used in a variety of different applications, not just for brightening and dimming lights. Essentially, because they do allow the voltage across a line to be varied, they can used for any number of applications where voltage does have to be changed a bit to accommodate various devices.

There will be a primary voltage rating, a secondary voltage rating and maximum and minimum power ratings. There may also be a minimum frequency rating and a maximum frequency rating.


Primary Voltage Rating

The primary voltage rating is the voltage that can be applied to the primary side of the transformer under normal operating conditions. This needs to be maintained within the stated limits for safety purposes.


Secondary Voltage Rating

The secondary voltage rating is the voltage that will be obtainable from the secondary coil under normal operating conditions with the primary voltage rating applied to the primary coil.


Power Rating: This describes the maximum amount of power that can be applied to the transformer without causing a malfunction or without putting the transformer in danger of malfunctioning. If this number is exceeded, the transformer may overheat or other damage may occur, such as the degrading of the insulation in the windings. Ideally, the entire system to which the transformer is attached should have a lower wattage than the maximum power rating of the transformer itself.

Types of lightning transformers


Electronic: Electronic transformers are designed for low-voltage applications. These do have some advantages over other types of transformers. They typically operate at lower temperatures and are more compact. These transformers are limited to 300 W of power.


Isolation Transformers: Isolation transformers separate one circuit from another. They are typically used in applications where sensitive equipment needs to be isolated from a potentially dangerous amount of voltage or current traveling across a primary power source. These types of transformers may be used in lighting applications where there is a very high voltage line involved and where the low-voltage circuit needs to be adequately separated for safety purposes.


Magnetic: Magnetic Transformers rely upon the relationship between magnetism and electricity to transform voltage and current. By inducing a magnetic field in the secondary coil, an electrical current is induced in the coil. The number of windings determine the amount of voltage in the secondary coil. These types of transformers have been in use for a very long time and, over that time, they have become very advanced and efficient.

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Description Price Primary Voltage Rating Secondary Voltage Rating Power Rating Dimensions Length Width Depth Minimum Load Requirement Minimum Temperature Maximum Temperature Weight Type Dimming Method Diameter
RS Stock No. 714-1394
BrandRS Pro
£8.40
Each
Units
230V ac 12 V 20 → 105W 107 x 35 x 21mm 107mm 35mm 21mm 20W -20°C +55°C 80g Electronic Trailing Edge -
RS Stock No. 714-1388
BrandRS Pro
£7.41
Each
Units
230 → 240V ac 11.5 V 10 → 60W 86 x 31 x 20mm 86mm 31mm 20mm 10W - +45°C 50g Electronic Trailing Edge -
RS Stock No. 714-1391
BrandRS Pro
£14.01
Each
Units
230V ac 11.5V 20 → 70W 53 (Dia.) x 22mm - - 22mm 20W - +45°C 70g Electronic Trailing Edge 53mm
RS Stock No. 714-1385
BrandRS Pro
£25.78
Each
Units
230V ac 12V 100 → 200W 222 x 54 x 45mm 222mm 54mm 45mm 100W - +35°C 487g Electronic Trailing Edge -
RS Stock No. 811-7140
Mfr. Part No.94386
BrandGE
£6.36
Each
Units
220 → 240V 12V 20 → 60W 109 x 40 x 20.5mm 109mm 40mm 20.5mm - - - - - - -
RS Stock No. 714-1381
BrandRS Pro
£17.97
Each
Units
230V ac 12 V 30 → 150W 190 x 49 x 39mm 190mm 49mm 39mm 30W - +40°C 205g Electronic Trailing Edge -
RS Stock No. 575-964
Mfr. Part No.12060
BrandSunnex
£33.56
Each
Units
230V ac 12 V ac 60W 99 x 69 x 72mm 99mm 69mm 72mm - - - - - - -
RS Stock No. 669-2901
Mfr. Part No.927026
BrandOsram
£37.06
Each
Units
230 → 240V ac 11.3V ac 35 → 105W 170 x 44 x 34mm 170mm 44mm 34mm 50W -20°C +50°C 185g Electromagnetic Trailing Edge -
RS Stock No. 856-106
Mfr. Part No.12080
BrandSunnex
£38.66
Each
Units
415V ac 12 V ac 60W - - - - - - - - - - -
RS Stock No. 158-7227
Mfr. Part No.HIT 105
BrandBlock
£38.28
Each
Units
230V ac 11.5V ac 105W 166 x 76 x 77mm 166mm 76mm 77mm - - +40°C 2kg Isolation - -
RS Stock No. 223-1896
Mfr. Part No.HIT250
BrandBlock
£65.73
Each
Units
230V ac 11.5 V ac 250W 223 x 117 x 117mm 223mm 117mm 117mm - - +40°C 4.2kg Isolation Inductive -
RS Stock No. 281-8128
Mfr. Part No.442310
BrandOsram
£17.29
Each
Units
230 → 240V ac 11.3V ac 35 → 105W 108 x 52 x 33mm 108mm 52mm 33mm - - - - Electromagnetic Leading Edge -
RS Stock No. 281-8134
Mfr. Part No.442334
BrandOsram
£20.98
Each
Units
230 → 240V ac 11.3V ac 35 → 105W 108 x 52 x 33mm 108mm 52mm 33mm - - - - Electromagnetic Leading Edge -
RS Stock No. 2550221934
Mfr. Part No.ZBV5B
£19.17
Each
Units
- - - - - - - - - - - - - -
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