EL2042 - Switching off inductive loads

When switching off inductive loads, high induction voltages result from interrupting the current quickly.
These induction voltages can cause energy to be fed back into the terminal.
If the regenerated energy is larger than the switch-off energy (inductive) specified in the technical data, the terminal may be destroyed.

EL2042 - Switching off inductive loads 1:

Protection against high induction voltages

To protect against voltage peaks such as can occur when switching inductive loads, we recommend to provide suitable protective circuits (e.g. with the free-wheeling diode, RC combination or varistor) directly at the actuator.