Ladeoperatøren viser hvilken ladeplugg som passer i ladeporten.

It means the charging operator or the charging-station operator, depending on context.

It is a compound noun:

• lade = charging
• operatør = operator
• -en = the (definite singular ending)

So ladeoperatøren literally means the charging operator.

In Norwegian, the definite article is often attached to the end of the noun instead of being a separate word.

So:

• en ladeoperatør = a charging operator
• ladeoperatøren = the charging operator

This is very common in Norwegian:

• en bil = a car → bilen = the car
• en plugg = a plug → pluggen = the plug

Viser means shows.

It is the present tense of å vise = to show.

Examples:

• Han viser veien. = He shows the way.
• Skjermen viser informasjon. = The screen shows information.

In your sentence, viser means that the operator/interface/system shows which plug fits.

Because the main verb is viser = shows. Norwegian does not need an extra is here, just like English does not say The operator is shows...

The structure is:

• Ladeoperatøren = subject
• viser = verb
• hvilken ladeplugg ... = object/content of what is being shown

So it works like:

• The operator shows which plug fits...

Hvilken means which.

It changes form depending on gender and number:

• hvilken for singular common-gender nouns
• hvilket for singular neuter nouns
• hvilke for plural

Here it is hvilken because ladeplugg is a common-gender singular noun:

• en ladeplugg = a charging plug

So:

• hvilken ladeplugg = which charging plug

Because hvilken is used when you mean which one out of possible options.

• hva = what
• hvilken = which

Since the sentence is about identifying the correct plug, Norwegian uses hvilken:

• hvilken ladeplugg som passer = which charging plug fits

A native English speaker might sometimes expect what, but in Norwegian this is clearly a which situation.

Because this is an embedded clause, not a direct question.

Compare:

Direct question:

• Hvilken ladeplugg passer i ladeporten?
• Which charging plug fits in the charging port?

Embedded clause:

• Ladeoperatøren viser hvilken ladeplugg som passer i ladeporten.
• The charging operator shows which charging plug fits in the charging port.

In embedded questions/clauses, Norwegian does not use question word order. That is why you do not invert the verb.

Here som works like that/which in English.

It links ladeplugg to the clause passer i ladeporten:

• hvilken ladeplugg som passer i ladeporten
• which charging plug that fits in the charging port

In natural English, we usually do not say that here, but Norwegian often uses som in this kind of structure.

You can think of it as introducing the descriptive part: the plug that fits.

Here passer means fits.

It comes from å passe, which can have several meanings depending on context:

• fit
• suit
• match
• look after (in other contexts)

In this sentence, it clearly means physically fits / is the right type for:

• passer i ladeporten = fits in the charging port

Do not confuse it with English pass. They are not the same here.

Because i means in here, and the idea is that the plug fits into the port.

So:

• passer i ladeporten = fits in the charging port

Norwegian often uses i when talking about physical insertion or fitting into something.

You may also see passe til in other contexts:

• Denne kabelen passer til bilen. = This cable fits / is compatible with the car.

A rough difference is:

• passe i = fit in
• passe til = fit/suit/be compatible with

Ladeporten means the charging port.

It is another compound noun:

• lade = charging
• port = port
• -en = the

So:

• en ladeport = a charging port
• ladeporten = the charging port

Because the sentence is referring to a specific charging port in the situation.

• i ladeporten = in the charging port
• not just any charging port, but the relevant one

Norwegian often uses the definite form when the noun is understood from context, just like English uses the.

Yes. Norwegian uses compound nouns very heavily.

Here are the parts:

• ladeoperatøren = lade
  • operatør
    • -en
• ladeplugg = lade
  • plugg
• ladeporten = lade
  • port
    • -en

This is extremely normal in Norwegian. English often uses separate words where Norwegian prefers one compound word.

Usually which charging plug is better.

English sometimes uses what where Norwegian uses which, but here the Norwegian clearly suggests choosing among available plug types. So which is the most accurate translation.

If you said what charging plug in English, it might still be understandable, but which charging plug matches the Norwegian grammar more closely.

The structure is:

• Ladeoperatøren = subject
• viser = main verb
• hvilken ladeplugg som passer i ladeporten = clause functioning as what is shown

So the sentence breaks down as:

• The charging operator shows
• which charging plug
• fits in the charging port

This is a very common Norwegian pattern:

• [subject] + [verb] + [embedded clause]

For example:

• Hun vet hvilken buss som går dit.
• She knows which bus goes there.

Yes, it is grammatical and natural.

Depending on context, a Norwegian speaker might also say something slightly different, such as using til instead of i if they want to emphasize compatibility rather than physical insertion. But the given sentence is perfectly understandable and natural, especially in a technical or instructional context.