Electronic digital modules
The indication and protection modules allow a longer life to the relay which is supported by these modules, and also allow verifying the state found the relays.
When an inductive load commutes, in the case of electromechanical relays, the graph of the current evolution over time differs significantly to the evolution of the voltage across the load. This is due to inductive loads are opposed to changes in the current flowing through them.
To avoid these destructive effects, these peaks can be minimized with the use of free-wheeling diodes, varistors, or modules, RC (snubber circuits).
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