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Toroidal Transformers

Toroidal transformers are a popular choice in various electronic applications due to their efficiency, compact design, and low electromagnetic interference. They are characterised by their distinctive "donut" shape, and are commonly used to convert mains power to a lower voltage for electronic devices. The core, typically made of laminated steel or other ferromagnetic materials, is wound with copper wire, creating a transformer with minimal magnetic flux leakage.

Benefits of Toroidal Transformers

Space Efficiency: Toroidal transformers take up less space than their traditional square counterparts using less real estate. Some suppliers suggest that fitting a toroidal transformer with flying leads instead of terminal blocks can save you up to 60% space.
Simplified Mounting: These transformers are easy to mount, some even just require a single bolt to fix them in place.
Flexible Dimensions: Toroidal transformers offer flexible dimensions to suit various applications.
Reduced Noise and EMI: Toroidal power transformers offer great noise reduction and emit less EMI (electromagnetic interference) than standard transformers.
Low Stray Field: Toroidal power transformers have a low stray field, which minimises electromagnetic interference with nearby components.
Quiet Operation: Toroidal power transformers are quieter to run than standard transformers and create less hum noise.
Cost-Effectiveness: Toroidal transformers take less energy to maintain a magnetic field and, therefore, use less power, resulting in lower operating costs.

How do Toroidal Transformers Work

Toroidal transformers utilise electromagnetic induction to transfer electrical energy between their windings. This process allows devices with varying voltage and current requirements to operate from a single power source.

Toroidal transformers can efficiently step voltage up or down, adjusting the electrical energy to meet the needs of the connected device. They are available in open or encapsulated designs, with some models featuring PCB mounting pins for simplified integration.

Common Applications of Toroidal Transformers

Audio Equipment: Toroidal transformers for audio are highly valued for their low noise and minimal interference, ensuring clean and clear audio signal reproduction.
Medical Devices: The compact size, quiet operation, and low leakage of toroidal transformers make them ideal for medical equipment.
Industrial Automation: Toroidal transformers provide stable and efficient power in industrial control systems, robotics, and other automation equipment.
Renewable Energy: Toroidal transformers are used in inverters for solar and wind power systems due to their high efficiency.

How to Choose the Right Toroidal Transformer

Voltage Requirements: Determine the input and output voltages required for your application. Ensure the toroidal transformer's primary and secondary windings from your supplier match these voltage specifications.
Current Rating: Calculate the current draw of your load. Select a toroidal transformer with a current rating that meets or exceeds this requirement to avoid overloading and potential failure.
Frequency: Match the toroidal transformer's operating frequency to the frequency of your power source.
Size and Weight: Consider the physical space available for the transformer and any weight limitations. Toroidal transformers come in various sizes and weights, so choose one that fits your application's constraints.

How to Order Toroidal Transformers from RS Hong Kong

RS Hong Kong is a trusted global supplier of high-quality electronic components, offering a wide selection of toroidal transformers from leading brands like RS PRO, Nuvotem Talema, and Block.

To buy a toroidal transformer online, browse our catalogue and use our convenient and intuitive search function to find one that meets your specific requirements and price point.

Browse our extensive range of competitively priced electronic components and tools, from semiconductor mosfets to electrolytic capacitors, ensuring fast and efficient procurement for your next project.

How Delivery Works at RS Hong Kong

RS Hong Kong strives to make getting your toroidal transformers as smooth as possible. We understand that timing is important, so we offer a range of delivery choices like same working day delivery for orders placed before noon, Monday to Friday, and working day delivery for orders placed on Saturday, Sunday, or on holidays from Hong Kong stock.

For detailed information about delivery methods and estimated arrival times, please check out our dedicated delivery information page.

563 Products showing for Toroidal Transformers

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In Stock RS PRO 230 V ac 2 x 6 V ac Toroidal Transformer 2 Output 50 VA RS Stock No. 671-8959 Subtotal (1 unit) HK$391.80 HK$391.80/unit Quantity	230 V ac	-	Toroidal Transformer	2 x 6 V ac	-	-	2	4.167A	33mm	50VA	740g	80mm	-	50Hz	60Hz	-	-	-	-	-	-	-	Copper Conductor Termination Wire	-	-	No
In Stock RS PRO 2 x 115 V ac 2 x 24 V ac Toroidal Transformer 2 Output 500 VA, RoHS, IEC/BS/EN 61558-1, IEC/BS/EN 61558-2-6, RS Stock No. 117-6071 Subtotal (1 unit) HK$1,283.60 HK$1,283.60/unit Quantity	2 x 115 V ac	-	Toroidal Transformer	2 x 24 V ac	-	-	2	-	85mm	500VA	8.4kg	172mm	-	50Hz	60Hz	-	-	Dual Primary, Dual Secondary	105°C	Bolt Mount	-	-	Termination Wire	-	-	RoHS, IEC/BS/EN 61558-1, IEC/BS/EN 61558-2-6, AS/NZS 61558.2.6, AS/NZS 61558.1, CE, UL506 approved and marked
In Stock RS PRO 2 x 115 V ac 2 x 40 V ac Toroidal Transformer 2 Output 300 VA, IEC/BS/EN 61558-2-6, IEC/BS/EN 61558-1, UL506, RS Stock No. 117-6065 Subtotal (1 unit) HK$851.10 HK$851.10/unit Quantity	2 x 115 V ac	-	Toroidal Transformer	2 x 40 V ac	-	-	2	-	85mm	300VA	8.4kg	172mm	-	50Hz	60Hz	-	-	Dual Primary, Dual Secondary	105°C	Screw	-	-	Termination Wire	-	-	IEC/BS/EN 61558-2-6, IEC/BS/EN 61558-1, UL506, AS/NZS 61558.1, AS/NZS 61558.2.6
Last RS stock RS PRO 2 x 115 V ac 2 x 12 V Toroidal Transformer 2 Output, REACH, RoHS RS Stock No. 124-3846 Subtotal (1 unit) HK$173.20 HK$173.20/unit Quantity	2 x 115 V ac	-	Toroidal Transformer	2 x 12 V	-	-	2	1785mA	19.5mm	-	110g	-	-	-	50Hz	-	-	-	60°C	Through Hole	-	-	-	-	-	REACH, RoHS
In Stock RS PRO 230 V ac 2 x 12 V ac Toroidal Transformer 2 Output 225 VA, IEC 61558 Class II, EN 61558 Class II, UL 506, VDE0570 RS Stock No. 671-9167 Subtotal (1 unit) HK$756.50 HK$756.50/unit Quantity	230 V ac	-	Toroidal Transformer	2 x 12 V ac	-	-	2	9.375A	50mm	225VA	2.29kg	120mm	-	50Hz	60Hz	-	-	-	-	-	-	-	Copper Conductor	-	-	IEC 61558 Class II, EN 61558 Class II, UL 506, VDE0570 Class II, RoHS
In Stock RS PRO 230 V ac 2 x 18 V ac Toroidal Transformer 2 Output 50 VA RS Stock No. 671-9104 Subtotal (1 unit) HK$482.00 HK$482.00/unit Quantity	230 V ac	-	Toroidal Transformer	2 x 18 V ac	-	-	2	1.389A	33mm	50VA	740g	80mm	-	50Hz	60Hz	-	-	-	-	-	-	-	Copper Conductor Termination Wire	-	-	No
Temporarily out of stock RS PRO 230 V ac 55 V ac Toroidal Transformer 2 Output 225 VA, EN61558 Class II, UL506, Non-Short-Circuit Proof, IEC61558 RS Stock No. 671-9047 Subtotal (1 unit) HK$938.80 HK$938.80/unit Quantity	230 V ac	-	Toroidal Transformer	55 V ac	-	-	2	4.5A	50mm	225VA	2.29kg	120mm	-	50Hz	60Hz	-	-	-	-	-	-	-	with Lead	-	-	EN61558 Class II, UL506, Non-Short-Circuit Proof, IEC61558 Class II, VDE0570 Class II
Temporarily out of stock RS PRO 2 x 115 V ac 2 x 55 V ac Toroidal Transformer 2 Output 3 kVA, AS/NZS 61558.1, IEC/BS/EN 61558-2-6, CE, AS/NZS RS Stock No. 117-6081 Subtotal (1 unit) HK$2,207.00 HK$2,207.00/unit Quantity	2 x 115 V ac	-	Toroidal Transformer	2 x 55 V ac	-	-	2	-	105mm	3kVA	20.5kg	172mm	-	50Hz	60Hz	-	-	Dual Primary, Dual Secondary	105°C	Surface	-	-	Termination Wire	-	-	AS/NZS 61558.1, IEC/BS/EN 61558-2-6, CE, AS/NZS 61558.2.6, AS/NZS 61558.2.4, IEC/BS/EN 61558-1, RoHS
In Stock RS PRO 230 V ac 2 x 18 V ac Toroidal Transformer 2 Output 225 VA, VDE0570 Class II, UL506, IEC61558 Class II, EN61558 RS Stock No. 671-9038 Subtotal (1 unit) HK$450.90 HK$450.90/unit Quantity	230 V ac	-	Toroidal Transformer	2 x 18 V ac	-	-	2	1.0408A	50mm	225VA	2.29kg	120mm	-	50Hz	60Hz	-	-	-	-	-	-	-	Solid Copper Conductor Terminal with PVC Insulation	-	-	VDE0570 Class II, UL506, IEC61558 Class II, EN61558 Class II
In Stock RS PRO 2 x 115 V ac 2 x 24 V ac Toroidal Transformer 2 Output 120 VA, RoHS, AS/NZS 61558.1, IEC/BS/EN 61558-1, IEC/BS/EN RS Stock No. 117-6056 Subtotal (1 unit) HK$541.70 HK$541.70/unit Quantity	2 x 115 V ac	-	Toroidal Transformer	2 x 24 V ac	-	-	2	-	85mm	120VA	8.4kg	172mm	-	50Hz	60Hz	-	-	Dual Secondary, Dual Primary	105°C	Bolt Mount	-	-	Termination Wire	-	-	RoHS, AS/NZS 61558.1, IEC/BS/EN 61558-1, IEC/BS/EN 61558-2-6, UL506, CE, AS/NZS 61558.2.6
In Stock RS PRO 230 V ac 2 x 18 V ac Toroidal Transformer 2 Output 120 VA RS Stock No. 671-9139 Subtotal (1 unit) HK$424.70 HK$424.70/unit Quantity	230 V ac	-	Toroidal Transformer	2 x 18 V ac	-	-	2	3.333A	48mm	120VA	1.4kg	96mm	-	50Hz	60Hz	-	-	-	-	-	-	-	Copper Conductor	-	-	No
Currently unavailable RS PRO 2 x 115 V ac 2 x 50 V ac Toroidal Transformer 2 Output 300 VA, CE, RoHS RS Stock No. 117-6066 Subtotal (1 unit) HK$1,014.60 HK$1,014.60/unit Quantity	2 x 115 V ac	-	Toroidal Transformer	2 x 50 V ac	-	-	2	-	60mm	300VA	2.7kg	117mm	-	50Hz	60Hz	-	Open	Dual Primary	105°C	Surface	-	-	Termination Wire	-	-	CE, RoHS
In Stock RS PRO 230 V ac 2 x 6 V ac Toroidal Transformer 2 Output 15 VA RS Stock No. 671-9053 Subtotal (1 unit) HK$361.40 HK$361.40/unit Quantity	230 V ac	-	Toroidal Transformer	2 x 6 V ac	-	-	2	1.25A	31mm	15VA	365g	60mm	-	50Hz	60Hz	-	-	-	-	-	-	-	Copper Conductor Termination Wire	-	-	No
In Stock RS PRO 2 x 115 V ac 2 x 12 V ac Toroidal Transformer 2 Output 100 VA, IEC 61558-2-6 RS Stock No. 117-6051 Subtotal (1 unit) HK$506.10 HK$506.10/unit Quantity	2 x 115 V ac	-	Toroidal Transformer	2 x 12 V ac	-	-	2	-	42mm	100VA	1.1kg	90mm	-	50Hz	60Hz	-	Open	Dual Primary	105°C	Surface	-	-	Termination Wire	-	-	IEC 61558-2-6
Temporarily out of stock RS PRO 230 V ac 2 x 25 V ac Toroidal Transformer 2 Output 225 VA RS Stock No. 173-0249 Subtotal (1 box of 6 units) HK$4,938.60 HK$823.10/unit Quantity	230 V ac	-	Toroidal Transformer	2 x 25 V ac	-	-	2	4.5A	50mm	225VA	2.3kg	120mm	-	50Hz	60Hz	-	-	-	-	-	-	-	Copper Conductor	-	-	No
Limited stock RS PRO 230 V ac 2 x 55 V ac Toroidal Transformer 2 Output 225 VA, UL 506, RoHS, IEC 61558 Class II, EN 61558 Class II, RS Stock No. 671-9185 Subtotal (1 unit) HK$656.00 HK$656.00/unit Quantity	230 V ac	-	Toroidal Transformer	2 x 55 V ac	-	-	2	2.045A	50mm	225VA	2.29kg	120mm	-	50Hz	60Hz	-	-	-	-	-	-	-	Copper Conductor	-	-	UL 506, RoHS, IEC 61558 Class II, EN 61558 Class II, VDE0570 Class II
In Stock RS PRO 230 V ac 2 x 6 V ac Toroidal Transformer 2 Output 50 VA RS Stock No. 671-9088 Subtotal (1 unit) HK$238.00 HK$238.00/unit Quantity	230 V ac	-	Toroidal Transformer	2 x 6 V ac	-	-	2	4.167A	33mm	50VA	740g	80mm	-	50Hz	60Hz	-	-	-	-	-	-	-	Copper Conductor Termination Wire	-	-	No
Currently unavailable RS PRO 2 x 115 V ac 2 x 22 V Toroidal Transformer, REACH, RoHS RS Stock No. 173-0158 Subtotal (1 box of 20 units) HK$5,047.40 HK$252.37/unit Quantity	2 x 115 V ac	-	Toroidal Transformer	2 x 22 V	-	-	-	1785mA	26.3mm	-	304g	-	-	-	50Hz	-	-	-	60°C	Through Hole	-	-	-	-	-	REACH, RoHS
In Stock RS PRO 230 V ac 2 x 6 V ac Toroidal Transformer 2 Output 50 VA, RoHS, UL RS Stock No. 123-4016 Subtotal (1 unit) HK$485.00 HK$485.00/unit Quantity	230 V ac	-	Toroidal Transformer	2 x 6 V ac	-	-	2	-	42mm	50VA	650g	87mm	-	50Hz	60Hz	-	Open	Dual Secondary	-	Surface	-	-	Wire	-	-	RoHS, UL
In Stock RS PRO 230 V ac 2 x 55 V ac Toroidal Transformer 2 Output, EN615581 Class II, UL506, EN60065 Class II, UL51 RS Stock No. 123-3997 Subtotal (1 unit) HK$1,419.10 HK$1,419.10/unit Quantity	230 V ac	-	Toroidal Transformer	2 x 55 V ac	-	-	2	-	70mm	-	3.5kg	136mm	-	50Hz	60Hz	-	-	Dual Secondary	180°C	Surface	-	-	Wire	-	-	EN615581 Class II, UL506, EN60065 Class II, UL51