Toroidal transformers for industrial power supplies
- High efficiency due to short magnetic paths and a closed toroidal core
- Compact design for equipment manufacturing, power supplies, electronics, and control systems
- Technical specifications based on design, VA rating, connection type, voltage, and ambient temperature
- As a technical distributor for industrial applications, ROTIMA supplies tested toroidal transformers from Switzerland and Germany
Over 60 years of experience
in the electrical engineering and electronics industry
Short delivery times
through optimized warehousing
Germany and Switzerland
Dual location strength and reliability
A round core alone does not make a suitable toroidal transformer
When a transformer needs to operate efficiently, compactly, and with low stray fields, toroidal transformers are used. Their ring-shaped magnetic cores minimize magnetic losses and enable higher power density with a low profile. When factors such as heat generation, installation space, noise levels, and electrical safety are evaluated together, this often becomes a key consideration for developers and designers.
ROTIMA is happy to assist you with the selection and technical evaluation of standard models or custom toroidal transformers intended for use in laboratory equipment, mass-produced devices, machine modules, and industrial power supply systems. In addition to inrush behavior, load profile, thermal reserve, and mechanical integration, our technicians also verify the rated voltage.
To ensure a robust design, we consider, among other factors:
A toroidal transformer with the same VA rating can behave significantly differently during operation if the ambient temperature, winding configuration, no-load voltage, encapsulation, and fuse protection are not suited to the device. This is precisely where our engineering team comes in; we do not base our selection on a single parameter.
ROTIMA is happy to assist you with the selection and technical evaluation of standard models or custom toroidal transformers intended for use in laboratory equipment, mass-produced devices, machine modules, and industrial power supply systems. In addition to inrush behavior, load profile, thermal reserve, and mechanical integration, our technicians also verify the rated voltage.
To ensure a robust design, we consider, among other factors:
- with multiple output voltages or a secondary side configured as a 12V or 24V toroidal transformer
- with a different input voltage or a 230V toroidal transformer on the primary side
- for safety-related requirements with reference to standards, as a toroidal transformer compliant with EN 61558
- in open design, with an internal hole encapsulated design, or fully encapsulated design
- Protection options such as shielding winding,thermal switch, and thermal fuse
- Electrical interfaces via connection cables, stranded wires, or connectors
- Power ratings, depending on the model and project requirements, from 10 VA to 5000 VA
- Applications in industry, medical technology, measurement and testing technology, audio, and hi-fi
A toroidal transformer with the same VA rating can behave significantly differently during operation if the ambient temperature, winding configuration, no-load voltage, encapsulation, and fuse protection are not suited to the device. This is precisely where our engineering team comes in; we do not base our selection on a single parameter.
Trafox, our official distributor providing technical support
ROTIMA does not manufacture its toroidal transformers in-house; instead, it acts as a technical distributor and official sales partner for high-quality transformer solutions. We combine technical consulting, project-specific preselection, and procurement, ensuring that you do not simply receive just any catalog item. You receive a product that has been professionally evaluated for your specific application.
’s experts determine the mechanical limits, electrical specifications, and appropriate connection options for a custom-made toroidal transformer. This ensures you receive a custom-made toroidal transformer if leakage current, mounting requirements, standard voltages, installation space, shielding, or thermal specifications are insufficient.
In addition, we assess whether it is technically necessary to use a potted toroidal transformer. Potting can improve noise attenuation, moisture protection, and mechanical stability. However, it also affects heat dissipation and should therefore be carefully matched to the installation orientation and power dissipation.
’s experts determine the mechanical limits, electrical specifications, and appropriate connection options for a custom-made toroidal transformer. This ensures you receive a custom-made toroidal transformer if leakage current, mounting requirements, standard voltages, installation space, shielding, or thermal specifications are insufficient.
In addition, we assess whether it is technically necessary to use a potted toroidal transformer. Potting can improve noise attenuation, moisture protection, and mechanical stability. However, it also affects heat dissipation and should therefore be carefully matched to the installation orientation and power dissipation.
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Toroidal transformers
Using the wrong toroidal transformer can be costly during operation
It is rarely immediately apparent when a technically unsuitable toroidal transformer is used. The first problems become apparent during device testing, during temperature measurement, when the device is turned on, or during continuous operation. Common causes include insufficient power reserve, failure to account for inrush current, improper fusing, incorrect connection configuration, or an unsuitable potting compound.
The inrush current in the toroidal transformer must be taken into account. In a closed magnetic circuit, a brief high current surge can occur during power-up, which—depending on the inrush current limit, power rating, and application—may require slow-blow fuses or a tailored protective circuit.
ROTIMA toroidal transformers are therefore considered an integral part of the entire electrical system. Our project engineers evaluate the application in conjunction with the load, ventilation, printed circuit board, enclosure, protection concept, and installation. This helps reduce hum, failures, fuse trips, unnecessary heating, and subsequent retrofitting costs.
We clearly distinguish between related solutions. Our isolating transformers, control transformers, and safety transformers can be installed depending on protection requirements and the application, but they are not considered equivalent to toroidal transformers. Toroidal current transformers also serve a different purpose, as they are used for power supply rather than current measurement.
This provides technical buyers with comparable product variants, a solid basis for decision-making, and clear specifications for series production, inquiries, samples, and spare parts supply.
The inrush current in the toroidal transformer must be taken into account. In a closed magnetic circuit, a brief high current surge can occur during power-up, which—depending on the inrush current limit, power rating, and application—may require slow-blow fuses or a tailored protective circuit.
ROTIMA toroidal transformers are therefore considered an integral part of the entire electrical system. Our project engineers evaluate the application in conjunction with the load, ventilation, printed circuit board, enclosure, protection concept, and installation. This helps reduce hum, failures, fuse trips, unnecessary heating, and subsequent retrofitting costs.
We clearly distinguish between related solutions. Our isolating transformers, control transformers, and safety transformers can be installed depending on protection requirements and the application, but they are not considered equivalent to toroidal transformers. Toroidal current transformers also serve a different purpose, as they are used for power supply rather than current measurement.
This provides technical buyers with comparable product variants, a solid basis for decision-making, and clear specifications for series production, inquiries, samples, and spare parts supply.
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What can we do for you?
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Toroidal transformers
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