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Protection of Class B+C+D
Accordance with the requirements of Class I+II+III
Max. voltage Uc 385 V ac
The current study (8 / 20) In 20 kA
Current Max. (8 / 20) Imax 65 kA
Reducing voltage <1.8 kV
Surge arresters (surge protective devices - SPD) is used to protect electrical equipment and appliances from the effects of short-term surges, which occur due to atmospheric discharges and switching marches in industrial installations. For effective protection for internal installations with surge protectors include cascade (the coordinated protection), each of the three stages of the cascade reduces the energy waves surge to an acceptable level.
- Class I (B) - lightning arresters, usually tested wave 10/350 microseconds. Under Moeller the canned spark gap with controlled ionization, pulse discharge currents up to 100 kA
- Class II (C) - surge arresters for wave 8 / 20 microseconds, varistor surge for 20 (40) kA
- Class III (D) - surge arresters for wave 8 / 20 microseconds, varistor surge protection for sensitive electronic equipment, pulse currents up to 10 kA
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