SIRIUS 3RT2 contactors/contactor assemblies
2.7 Accessories
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
173
Technical background information
The oscillograms below show what happens when contactor coils are disconnected without
and with overvoltage attenuation.
Coil without RC circuit




8
6S
>9@

W>Ë©V@
8
6S
Figure 2-27 Disconnection of a contactor coil without RC circuit
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 around 4 kV). Once the
disconnection process has started, the shower discharges occur for about 250 μs; after that,
the vibration is simply damped.
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