SSB_W001-W044_GB.qxd
28.10.2003
8:58 Uhr
Seite W.39
Overvoltage protection Technical dictionary General data
Requirement “for energy systems” Overvoltage protection for 230 / 400 V electricity mains
Eliminators for electricity mains (230/400 V) are divided into four requirement categories. Weidmüller has three groups of eliminators in its product range
Eliminators in requirements class B
Eliminators in requirements class C
Eliminators in requirements class D
Eliminators installed for the purpose of lightning protection equipotential bonding, capable of coping with direct strikes of lightning. These eliminators are tested with a simulated lightning test current/imp wave form 10/350 µs.
Eliminators installed for the purpose of overvoltage protection in stationary installations, e.g. distributors. These eliminators are tested using a rated leakage current isn, wave form 8/20 µs.
Eliminators installed for the purpose of overvoltage protection in stationary or mobile installations, particularly for mains sockets or terminal devices
Basic feed diagram 125 A
160 A measurement 160 A 160 A
Eliminator (according to draft VDE 0675 part 6) B 10/350 µ2
125 A KWh 3 ≈
125 A
Eliminator (according to draft VDE 0675 part 6) C 8/20 µs
Insulation coordination is rated for 6 kV in the 230/400 V mains. According to DIN VDE 0110, the overvoltage protection must not be lower then class IV.
Insulation coordination is rated for 4 kV in the 230/400 V mains. According to DIN VDE 0110, the overvoltage protection must not be lower than class III.
The B-eliminator is used for lightning protection equipotential bonding when a lightning eliminator is fitted to the building.
The C-eliminator is used for discharging to earth the energy coupled into the mains feed line. Used in switchboards
16 A
Eliminator (according to draft VDE 0675 part 6) D 1.2/50 µs Insulation coordination is rated for 2.5/ 1.5 kV in the 230/400 V mains network. DIN VDE 0110 stipulates that the overvoltage protection must not be lower than class II. The D-eliminator is used for discharging to earth the energy coupled into the mains feed line. Used in switchboards or sub-distributions.
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