Inrush current limiter

High-quality inrush current limiters offer decisive advantages for the reliable operation of electrical systems and make a significant contribution to reducing load peaks.

Greater protection for components and systems

High-quality inrush current limiters protect sensitive electronic and electromechanical components particularly reliably against high starting currents. Their optimized circuit design ensures uniform and reproducible limiting, which significantly reduces thermal and mechanical loads. This leads to significantly lower stress on transformers, power semiconductors, capacitors or conductor tracks and extends the service life of critical components. For industrial engineers, this means greater reliability and more stable system processes.

Avoidance of unwanted tripping in protection systems

High-quality inrush current limiters work particularly precisely and reproducibly. This prevents unintentional tripping of fuses, circuit breakers or residual current devices, which can occur with inferior or inaccurate limiting solutions. In systems with frequent switching cycles or many consumers operated in parallel, this ensures trouble-free operation and significantly reduces unplanned downtimes. High-quality devices guarantee constant performance even under changing load conditions.

Optimized dimensioning of the electrical infrastructure

By reliably intercepting high inrush current peaks, high-quality inrush current limiters enable a more economical design of components and supply structures. Cable cross-sections, transformers, fuses, or emergency power generators do not need to be oversized, as the current-limiting effect is guaranteed to be precise and consistent with every switch-on process. This saves material costs, reduces space requirements in the control cabinet, and optimizes planning and installation costs. High-quality solutions lead to significantly more efficient project implementation, particularly in mechanical engineering and energy distribution.

Reliable integration and long service life

Quality inrush current limiters are characterized by robust components, tested circuits and stable mechanical designs. This makes them particularly durable and reliable even in long-term industrial applications. Their design enables easy integration into existing and new systems without the need for additional modifications. In addition to high functional reliability, users benefit from low maintenance requirements and improved overall system availability.

Inrush current limiters are used wherever electrical loads cause disproportionately high current peaks for a short time when they are switched on. This applies to numerous industrial areas and applications. Below you will find some examples:

Transformers and inductive loads

When switched on, transformers often generate very high magnetization-related inrush currents, which can reach many times the rated current. Inrush current limiters protect both the transformer itself and downstream components and prevent protective devices from tripping. This is essential, especially in power distribution and test facilities.

Switch-mode power supplies and DC supply systems

Powerful switched-mode power supplies have large input capacitances that draw high currents for short periods when switched on. Inrush current limiters ensure controlled charging of these capacitors and thus enable safe operation - for example in automated production lines or IT infrastructures.

Engine start and drive technology

Electric motors - especially asynchronous and brushless types - generate high inrush currents when they start up from a standstill. In combination with frequency inverters or soft starters, inrush current limiters can further reduce the load at startup and improve grid stability. Ideal for mechanical engineering, conveyor technology or pump systems.

Capacitor banks and energy storage systems

Large capacitance packs, such as those used in power quality applications or energy storage systems, cause extreme current peaks when they are switched on. Inrush current limiters enable gentle charging and therefore protect the electrolytic capacitors and switching technology.

LED lighting systems and industrial light sources

Modern LED drivers generate high inrush currents, which can lead to problems in large lighting installations. Inrush current limitation reduces the load on cables, switchgear and fuses - especially in halls, production facilities or outdoor installations.

Selecting suitable inrush current limiters requires careful evaluation of the technical requirements and operating conditions. The following points provide initial guidance and support you in your decision.

Type of load and switch-on behavior

The characteristics of the connected load— capacitive, inductive, or mixed —significantly determine the type of limiting required. Transformers require a different limiting method than switching power supplies or motors. Manufacturer specifications regarding switch-on behavior should therefore be carefully analyzed.

Maximum inrush current peak

The inrush current limiter must be able to reliably limit the expected peak current. Information on current level, pulse duration, and repetition frequency is important. In applications with frequent switching, thermal load capacity is particularly important.

Nominal voltage and power range

The design of the inrush current limiter must be compatible with the mains voltage and the total power of the connected loads. For industrial applications, variants with a wide voltage and power range are useful in order to ensure flexibility.

Circuit type and bypass

Different topologies—such as PTC thermistors, resistor relay combinations, or electronic soft start solutions —each offer their own advantages. It is important to consider whether the inrush current limiter is automatically bypassed after the limiting phase in order to minimize energy losses, and whether the duration of the current limitation is sufficient to fully charge the downstream components.

Standards and safety requirements

In industrial environments, compliance with relevant standards —such as IEC or EN standards—plays a major role. The selected inrush current limiter should meet all necessary certifications to ensure safe and compliant application.

With decades of experience (since 1982) in power supply technology and a broad portfolio of leading manufacturers, we are your partner for customized solutions. Benefit from our strengths for your project:

Technical expertise

We understand the complex requirements of industrial applications and advise you individually.

Service and first-level support

We advise you in detail. Right from the start, you will have a direct contact person for your requirements/project.

Special solutions

On request, we can realize customer-specific adaptations for special applications. In addition to high-quality inrush current limiters, we also offer you complete turnkey enclosure systems that are precisely tailored to your specific requirements.

With us, you don't just get a device, but a complete solution - including technical support and long-term availability.