Áramtalanítjuk az eszközt, hacsak nem kell bekapcsolva maradnia.

It means we disconnect the power from it / we de-energize it / we power it down.

This verb is a bit more specific and technical than a simple turn off. It suggests removing electrical power from the device, not just pressing an on/off button.

It can be broken down like this:

• áram = electric current, electricity
• áramtalanít = to make something without power, to disconnect power
• -juk = we do it, in the definite verb form

So áramtalanítjuk az eszközt means we power down the device or we disconnect the device from power.

Because the verb has a definite object: az eszközt = the device.

Hungarian verbs often have two kinds of endings:

• indefinite conjugation: used when there is no specific object, or the object is indefinite
• definite conjugation: used when the object is specific/definite

Here the object is definite because it is az eszközt = the device, so Hungarian uses the definite form:

• áramtalanítunk = we disconnect power / we power down something (not specifically identified)
• áramtalanítjuk = we disconnect the power from the device / it

So the -juk ending is not random: it agrees with the fact that the object is definite.

There are two things happening here:

• az is the definite article the
• eszközt is eszköz
  • the accusative ending -t

So:

• eszköz = device, tool
• eszközt = device as a direct object

The article is az, not a, because eszköz begins with a vowel sound. Hungarian uses:

• a before consonant sounds
• az before vowel sounds

So:

• a könyv = the book
• az eszköz = the device

And in this sentence the device is the thing being acted on, so it takes the object ending:

• az eszközt = the device

Hacsak nem means unless.

This is a very common Hungarian pattern. Even though English unless does not contain a visible negative word, Hungarian normally uses nem in this construction.

So:

• hacsak nem kell bekapcsolva maradnia = unless it needs to remain switched on

You should learn hacsak nem as a fixed expression meaning unless.

A good way to think about it is:

• Megcsinálom, hacsak nem késő. = I’ll do it, unless it’s too late.
• Elmegyünk, hacsak nem esik. = We’ll go, unless it rains.

So the nem is normal and expected here.

Bekapcsolva describes a state: switched on, turned on.

It comes from bekapcsol = switch on / turn on, but here the form -va/-ve is used to show the resulting state.

So:

• bekapcsolni = to switch on
• bekapcsolva = switched on, in the switched-on state

That matters because the sentence is not saying to turn it on, but rather to remain in the on-state:

• bekapcsolva marad = remains switched on

So bekapcsolva is the right choice because it describes the condition the device stays in.

Because Hungarian is showing who is supposed to remain that way.

Maradnia is a personal infinitive. It is based on maradni = to remain, but it adds a personal ending that means for him/her/it to remain.

Here:

• maradni = to remain
• maradnia = for him/her/it to remain

The -a ending here refers to it, namely the device.

This is very common after kell:

• mennem kell = I have to go
• menned kell = you have to go
• mennie kell = he/she has to go
• maradnia kell = it/he/she has to remain

In your sentence, the order is slightly different, but the idea is the same.

It means it needs to remain switched on or it must stay switched on.

The structure is:

• kell = it is necessary / must
• bekapcsolva = switched on
• maradnia = for it to remain

Literally, it is something like:

unless it is necessary for it to remain switched on

In more natural English:

unless it needs to stay on

This kind of structure is very typical in Hungarian. Another way to see the same pattern is:

• Az ajtónak zárva kell maradnia. = The door must remain closed.
• A készüléknek bekapcsolva kell maradnia. = The device must remain switched on.

Your sentence just leaves out the repeated noun because it is already clear what maradnia refers to.

Hungarian usually does not need an explicit pronoun if the meaning is already clear.

In English, you say:

unless it needs to remain switched on

In Hungarian, the it is understood from the context, and it is also partly built into maradnia.

The device was already mentioned in the first clause:

• az eszközt = the device

So in the second clause, Hungarian does not need to repeat a pronoun like az or ő. The sentence naturally just says:

• hacsak nem kell bekapcsolva maradnia

The meaning is still clear: the one that may need to remain on is the device.

Yes, it is natural.

Hungarian word order is much more flexible than English word order. It depends a lot on topic, focus, and style, not just on subject-verb-object order.

So:

• Áramtalanítjuk az eszközt is natural, especially in technical instructions or procedural language.
• Az eszközt áramtalanítjuk is also possible, but it gives the object more topical emphasis.

Also, Hungarian often leaves out the subject pronoun when the verb ending already shows it. So there is no need to say mi for we:

• Áramtalanítjuk already means we disconnect the power

That is why the sentence can begin directly with the verb and still sound completely normal.