Does an EMP affect relay operation?

[neazoi]

Hello, my question is straight forward, does an EMP affect relay operation, both at the time of the time of the EMP pulse as well as after that?

 

[FvM]

I think the question is not straight forward in so far that the term EMP covers a wide range of energies and pulse forms. Also the coupling mechanism matters. You should be more specific.

 

[neazoi]

I think the question is not straight forward in so far that the term EMP covers a wide range of energies and pulse forms. Also the coupling mechanism matters. You should be more specific.

I consider the largest EMP, I think it is E1. I consider for example a relay connected as a multivibrator, as a way to generate HV from a DC battery source.
Also, I should add to the topic, if a transformer (small or large) is affected by the EMP as well, for example a transformer connected as a magnetic amplifier (special diode-free topologies).

Transformers and relays, should be thought as EMP-immune devices, but are these really are? For example the relay solenoid or a transformer may pick up the EMP and fry itself (inter-windings arcing etc).

Also there is a question of these devices will survive AFTER an EMP, or DURING an EMP.