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9.4 Surge suppressor
Technical background information
The oscillograms below show what happens when contactor coils are disconnected without
and with overvoltage attenuation.
Coil without RC circuit
Figure 9-8
Oscillogram of the disconnection of a contactor relay coil; the coil does not have an RC
circuit: Shower discharges are clearly visible (voltage peaks up to several kV). Once the
disconnection process has started, the shower discharges occur for about 250 μs; after that,
the vibration is simply damped.
302
Disconnection of a contactor coil without RC circuit
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
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