Switch disconnectors, DC circuit breakers

DC disconnectors and circuit breakers - key safety elements of the installation

DC disconnect switches and circuit breakers are essential components in modern electrical systems.   They ensure safe operation of DC-powered devices. At Onninen, we offer a wide selection of these products. Our portfolio includes leading brands such as Eti, Eaton, Emiter, Schneider Electric and Hager. Each of these manufacturers is known for their reliability and innovation.

In our daily practice, we see a growing demand for these devices. This is due to the development of renewable energy, especially photovoltaics. DC disconnectors for photovoltaic systems are particularly sought after. They ensure safe disconnection of panels from the rest of the installation. This is crucial during maintenance work or in emergency situations.

Types of DC disconnectors and circuit breakers - how to choose the right one?

Selecting the right DC disconnect switch or circuit breaker depends on many factors.   The key parameters are rated voltage, rated current and number of poles.   In the case of PV installations, resistance to weather conditions is also important. Onninen recommends disconnectors with a tightness class of IP65 or higher. They provide protection against dust and water jets.

We often come across the question about the differences between disconnectors and circuit breakers. Disconnectors are used to manually disconnect circuits. Circuit breakers, on the other hand, can automatically break the circuit in the event of an overload or short circuit. Both types of devices are used in PV systems. Circuit breakers protect against overloads. PV disconnectors allow for the safe disconnection of panels.

• DC disconnectors for photovoltaic systems
• Circuit breakers
• PV disconnectors
• PV string breakers
• Fire protection disconnectors for PV
• Modular isolating switches for photovoltaic systems

Our experience shows that choosing the right device can be a challenge. That is why we offer professional advice. Our specialists will help you choose a solution tailored to a specific installation. We take into account not only technical parameters, but also economic aspects.

Innovations in the field of DC switches and circuit breakers

The market for DC disconnectors and circuit breakers is developing dynamically.   Manufacturers are constantly introducing new solutions. One of the trends is miniaturization. Modern devices are getting smaller, which makes them easier to install in limited spaces. Another direction of development is the integration of functions. Devices that combine the features of a disconnector and a circuit breaker are becoming more common.

Many customers ask us about the possibility of remote control of disconnectors. This is particularly important in large photovoltaic installations. We offer disconnectors with motor drives. They enable remote disconnection of individual sections of the installation. This significantly facilitates system management and improves safety.

In the case of reorganization of the PV installation, we most often recommend modular isolating switches. They allow for flexible system configuration. They can be easily adapted to changing needs. This is especially valuable in dynamically developing companies.

Practical applications of DC disconnectors and circuit breakers

We recently implemented a comprehensive solution for a large farm project. The 100 kW PV installation required careful selection of safeguards.   We used PV fire safety disconnect switches and string breakers.   This allowed for optimal protection of the installation. The system can be safely disconnected in the event of a fire or during service work.

In industry, we often encounter the need to protect machines powered by direct current. This is where heavy-duty DC disconnectors come in handy. They must be resistant to harsh operating conditions, including vibrations and dust. Our portfolio includes devices that meet these requirements. They guarantee reliable operation even in extreme conditions.

DC disconnectors and circuit breakers are also used in energy storage systems. When installing a battery bank, it is crucial to ensure the possibility of quick disconnection. Our solutions allow for immediate interruption of the circuit in an emergency. This significantly increases the safety of the entire system.

In our practice, we often encounter hybrid installations. They combine different renewable energy sources. In such cases, the selection of universal protection is key. We offer DC disconnectors adapted to work in a wide voltage range. This allows them to be used in both PV circuits and small wind turbines.

• Securing photovoltaic installations
• Protection of DC powered industrial machines
• Safety of energy storage systems
• Universal security for hybrid installations

Selecting the appropriate DC disconnect switches and circuit breakers is crucial to the safety and efficiency of the installation.   At Onninen we do our best to advise you on the best solutions. Our team of experts is ready to help you choose the right devices for your specific needs. Please contact us and take advantage of our experience in DC protection.