Choosing the right load break switches
Load break switches for all your applications
Machine control, power distribution and photovoltaic installations
Operating in the electrical breaking technology market since 1922, SOCOMEC is both a global leader and unrivalled benchmark.
Our range of load break switches is currently one of the widest on the market. Although the SIRCO M and SIRCO products alone meet the majority of requirements, SOCOMEC has set out to cover the entire range of applications.
Load break switches for machine control Load break switches for
Main switchboard • • Distribution panel • • Emergency load break • • Genset output • • Network coupling • • Local safety load break • • •Machine control• Photovoltaic load break • Enclosed switches • • •
Why choose a load break switch designed for photovoltaic applications?
To ensure electrical separation during maintenance operations, or for emergency breaking to prevent a risk of fire or electrical shock, it is essential that dedicated photovoltaic switches are used.
These devices must be installed at each functional level of the installation based on its architecture.
In order to disconnect a direct current photovoltaic string, generator or UpS, only SIRCO PV or SIRCO MC PV devices can:
• Isolate the associated high DC voltages ,
• guarantee safe on-load disconnection several thousand times across the full range of DC currents linked to daily fluctuations in sunlight, up to 1500 VDC.
Devices designed for extreme conditions
SIRCOs have been designed for industrial use. They are extremely robust, with casings made from glass fibre-reinforced thermoset materials, bringing numerous benefits:
• Stable temperatures, unlike some thermoplastics,
• Excellent resistance to high temperatures,
• good electrical characteristics: Arc and insulation resistance,
• good mechanical characteristics: Dimensional stability and rigidity over time.
These benefits are particularly important in photovoltaic installations, where the temperature may be below 0°C or above 50°C.
Back-to-back design, an innovative solution
The SOCOMEC range of photovoltaic load break switches enables simultaneous on-load disconnection of two circuits using a single handle.
• Space saving: The overall width is the same as that of 3 or 4 pole devices. This enables significant savings, as compared to the use of two separate devices.
• Simple connection and integration.
• Increasing the voltage: Connecting the two devices in series allows on-load disconnection of voltages above 1000 VDC.
• Doubling the rating: by connecting the two devices in parallel.
What are the standards that apply to photovoltaic installations?
Photovoltaic installations are governed by international standards such as IEC and UL. These standards provide the guidelines for commissioning a photovoltaic installation.
• IEC 60364-7-712: Electrical installations of buildings
— Requirements for special installations or locations — Solar photovoltaic (PV) power supply systems.
• IEC 62548: Installation and safety requirements for photovoltaic (PV) generators.
For breaking devices
To date there is no specific IEC
Manufacturers must therefore refer to standard
IEC 60947-3. In the USA, the reference standard is UL98B. This standard, which is more stringent than IEC 60947-3, requires strict testing, in particular concerning temperatures and resistance to
SIRCO PVs have been developed in compliance with both IEC 60947-3 and UL98B.