What are different protection modules in RXM relays ?

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We have protection modules for RXM relays which are used to reduce the voltage peak on de-energization and therefore limit the energy of interference signals to a level that will not disturb surrounding coils and electronic devices.
These modules are used to help reduce the risk of:
* electromagnetic compatibility problems
* deterioration of contact materials
* damage to insulation due to overvoltage
* damage to electronic components

Protection with diode RXM040W
Protection with RC circuit RXM041BN7
Protection with varistor RXM021RB