Low voltage surge arrester type 2
SIEMENS Low-Voltage & Products
Type 2 surge arresters are installed downstream of type 1 lightning arresters in main distribution boards or sub-distribution boards. They protect low-voltage systems against transient overvoltages.
All spark gaps are tripped. For this reason, decoupling reactors are no longer required for the installation of overvoltage protection devices.
To ensure fault-free operation of photovoltaic systems, it is essential to have standardized protection against lightning and overvoltages. SPDs (5SD7 483-.) for the DC side protect the photovoltaic generator and the inverter against overvoltages.
In addition, there are now 4 new SPDs (5SD7 473-., 5SD7 485-.) for the protection of IT systems.
- The rated arrester voltage is a uniform 350 V AC. This increases safety in systems with extended voltage overshoots.
- All type 2 surge arresters are fitted with a mechanical fault indication that does not require an extra power supply.
- A thermal isolating arrester installed in each device offers a high degree of protection. In the event of overload, the surge arrester is disconnected from the mains the plant continues running.
- The protective modules are plug-in versions. No dismantling of electrical wires required when replacing the protective modules. When taking insulation measurements, the protective modules are simply removed in order to ensure disconnection from the power supply.