Isolating transformers
- A Wide Selection of Isolation Transformers
- For the electrical engineering and electronics industries
- Fast delivery, duty-free shipping from our German warehouse
- Direct line from Switzerland and Germany—no waiting on hold—we’re here for you
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
Isolation transformers are not a standard component when safety calculations are required
ROTIMA supplies isolation transformers as a technical supplier based in Germany and Switzerland. Isolation transformers are used in industrial applications where electrical circuits must be safely decoupled, interference paths reduced, and loads reliably powered. The key factor is the galvanic isolation between the primary and secondary circuits, ensuring that the line side and load side remain electrically separated from one another.
Our experts evaluate the input voltage, output voltage, rated power (VA), turns ratio, frequency range (50 Hz ), and the required insulation voltage as a comprehensive package. This is because only the interplay of thermal load, connection type, installation space, electrical insulation, and regulatory requirements determines which isolation transformer is technically appropriate.
For projects with heightened safety requirements, we verify whether an isolation transformer compliant with DIN EN 61558-2-4 is required. This design is relevant when protective isolation between the power grid and the load is required, or when a defined ground isolation is intended to reduce interference currents, leakage currents, and unwanted equalization currents.
Our experts evaluate the input voltage, output voltage, rated power (VA), turns ratio, frequency range (50 Hz ), and the required insulation voltage as a comprehensive package. This is because only the interplay of thermal load, connection type, installation space, electrical insulation, and regulatory requirements determines which isolation transformer is technically appropriate.
For projects with heightened safety requirements, we verify whether an isolation transformer compliant with DIN EN 61558-2-4 is required. This design is relevant when protective isolation between the power grid and the load is required, or when a defined ground isolation is intended to reduce interference currents, leakage currents, and unwanted equalization currents.
The transformer's design determines heat generation, stray fields, and installation
UI Isolation Transformers for Compact Power Supply Applications
Our UI isolation transformer is suitable for compact assemblies, control systems, and device power supplies with clearly defined installation space. Its core topology, featuring U- and I-shaped laminations, enables robust magnetic coupling and cost-effective design in the low- to medium-power range.
Our engineers evaluate the copper resistance, core losses, and stray inductance, as these values influence heating, efficiency, and voltage stability. Depending on the design, pin connections, studs, or PCB mounting are possible.
Our engineers evaluate the copper resistance, core losses, and stray inductance, as these values influence heating, efficiency, and voltage stability. Depending on the design, pin connections, studs, or PCB mounting are possible.
EI Isolation Transformers for Rugged Industrial Applications
Our EI isolation transformer is typically chosen when high availability, a robust power supply, and easy integration into devices or control cabinets are required. Heat dissipation is facilitated by the open design, while versions with mounting brackets, terminals, solder tabs, or plug-in tabs define the mechanical and electrical interfaces.
For this design, ROTIMA experts pay particular attention to creepage distances, test voltage, and insulation configuration. This is especially important when the transformer is to be used in machinery, test benches, control panel systems, or industrial automation.
For this design, ROTIMA experts pay particular attention to creepage distances, test voltage, and insulation configuration. This is especially important when the transformer is to be used in machinery, test benches, control panel systems, or industrial automation.
M-transformers for low-spurious and stable designs
Our M-transformer offers design advantages when it comes to controlling the path of windings and reducing stray fields. A low-stray-field design can be useful in sensitive equipment, measurement environments, or in assemblies with limited space.
Options such as our vacuum impregnation, PTC thermistors, or HF stranded wire are used when higher switching frequencies, temperature monitoring, or humidity become relevant. For demanding environments, our project engineers take into account the winding configuration, thermal class, and connection logic.
Options such as our vacuum impregnation, PTC thermistors, or HF stranded wire are used when higher switching frequencies, temperature monitoring, or humidity become relevant. For demanding environments, our project engineers take into account the winding configuration, thermal class, and connection logic.
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Isolating transformers
Select isolation transformers based on their application rather than just by VA
ROTIMA's single-phase isolating transformer is frequently used for laboratory equipment, test stations, or smaller system modules. Or you can choose our 230V-230V isolation transformer. If larger loads, industrial systems, test benches, or power distribution areas need to be safely isolated from the mains, our three-phase isolation transformer is the ideal solution.
If standard voltages, wiring diagrams, or mounting dimensions are insufficient, we can support you with custom isolation transformers. This includes custom voltages, special mounting options, specific insulation requirements, and project-specific approvals.
If standard voltages, wiring diagrams, or mounting dimensions are insufficient, we can support you with custom isolation transformers. This includes custom voltages, special mounting options, specific insulation requirements, and project-specific approvals.
Data Sheets for UI Transformers
Data Sheets for M-Transformers
Data Sheets for EI Transformers
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Isolating transformers
The technical specifications should be included before the inquiry
Voltage and power alone are not sufficient to ensure a robust design. Therefore, our engineers evaluate whether an isolation transformer, safety transformer, encapsulated isolation transformer, open-frame design, or a unit with special connections is more suitable.
Important selection criteria include:
When device safety, interference signals, leakage currents, and ground potentials directly affect measurement quality and availability, the technical evaluation is particularly critical. This is the case in applications such as medical technology, laboratories, IT, communications technology, and audio/video technology. That is why we test not only the transformer but also the environment in which it will later operate.
In systems susceptible to interference, isolation transformers can be used to reduce transmitted interference voltages. However, the specific integration into the system, device, or test setup remains critical. Incorrect sizing leads to overheating, voltage drop, unwanted hum, or premature aging of the insulation.
Important selection criteria include:
- a power range up to 2000 VA, depending on the design and application
- encapsulated isolation transformers for increased mechanical robustness and environmental protection
- for fixed mounting points, a potted design with mounting tabs
- double or reinforced insulation for increased protection requirements
- Short-circuit protection, overload protection, and overheating protection for critical operating conditions
- For control cabinet integration: TS 35 top-hat rail mounting
- UL-5085transformer, UL-1446 insulation system, VDE transformer, or CE transformer depending on the target market
- Toroidal transformer or flat-frame transformer if power density, stray field, or height must be addressed differently
When device safety, interference signals, leakage currents, and ground potentials directly affect measurement quality and availability, the technical evaluation is particularly critical. This is the case in applications such as medical technology, laboratories, IT, communications technology, and audio/video technology. That is why we test not only the transformer but also the environment in which it will later operate.
In systems susceptible to interference, isolation transformers can be used to reduce transmitted interference voltages. However, the specific integration into the system, device, or test setup remains critical. Incorrect sizing leads to overheating, voltage drop, unwanted hum, or premature aging of the insulation.
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What are the advantages of using DC voltage transformers compared to AC voltage transformers?
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What are the advantages of using DC voltage transformers compared to AC voltage transformers?
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