Blokada karty jest włączona w związku z wysoką kwotą.

Because karty is in the genitive singular. In Polish, when one noun describes another noun like the block/lock of the card, the second noun is very often put in the genitive.

So:

• blokada = block, lock, restriction
• karta = card
• blokada karty = card block / block on the card / card lock

This is a very common pattern:

• numer telefonu = phone number
• koniec filmu = end of the film
• właściciel samochodu = owner of the car

So karty here means of the card.

Włączona agrees with blokada, which is a feminine singular noun.

Polish adjectives and participle-like forms must agree with the noun in:

• gender
• number
• case

Since blokada is feminine singular, you get:

• włączony for masculine
• włączona for feminine
• włączone for neuter

So:

• blokada jest włączona
• not blokada jest włączony

Even though English might say enabled, active, or turned on, Polish uses the feminine form because of blokada.

Yes, literally włączona means turned on or switched on, but here it is used more broadly in a system/banking context to mean:

• enabled
• active
• on

So blokada karty jest włączona means something like:

• The card block is enabled
• The card lock is active
• A block on the card has been activated

This is common in technical or administrative language, where Polish uses włączyć / wyłączyć for features, settings, restrictions, and security options.

They are close in meaning, but not exactly the same.

• blokada karty jest włączona focuses on the blocking feature/status
• karta jest zablokowana focuses on the card itself being blocked

Compare:

• blokada karty jest włączona = the card-blocking function/restriction is active
• karta jest zablokowana = the card is blocked

In banking or app language, the first version can sound more like a system setting or account status. The second sounds more direct and natural in everyday speech.

W związku z means:

• in connection with
• due to
• because of
• with regard to

In this sentence, it introduces the reason for the block being active.

So:

• w związku z wysoką kwotą = due to the high amount

This phrase is quite formal and common in official, administrative, or customer-service language.

Because the fixed expression w związku z requires the instrumental case.

So:

• wysoka kwota = nominative
• wysoką kwotą = instrumental

Both the adjective and noun change:

• wysoka → wysoką
• kwota → kwotą

That is why the sentence has:

• w związku z wysoką kwotą

not:

• w związku z wysoka kwota
• w związku z wysokiej kwoty

It is instrumental singular.

Breakdown:

• kwota is a feminine noun
• instrumental singular of kwota = kwotą
• the adjective must match it, so wysoka becomes wysoką

So:

• nominative: wysoka kwota
• instrumental: wysoką kwotą

This happens because of the preposition in w związku z.

Yes. Wysoka kwota literally means high amount or large sum.

In English, high amount is understandable but a bit less natural than:

• a large amount
• a high sum
• a large sum

In Polish, wysoka kwota is completely normal and very common, especially in financial contexts.

It is understandable, but it sounds somewhat formal and system-like, as if it came from a banking app or automated message.

A native speaker might also say:

• Karta została zablokowana ze względu na wysoką kwotę.
• Blokada karty została włączona ze względu na wysoką kwotę.
• Karta została zablokowana z powodu wysokiej kwoty transakcji.

Your original sentence sounds plausible in a technical interface, especially if the app is describing a security setting or automatic restriction.

Yes. Some common alternatives are:

• z powodu = because of
• ze względu na = due to, in view of
• z racji = because of, by reason of

Examples:

• Blokada karty jest włączona z powodu wysokiej kwoty.
• Blokada karty jest włączona ze względu na wysoką kwotę.

Be careful, though, because different expressions require different cases:

• w związku z
  • instrumental
    
    • z wysoką kwotą
• z powodu
  • genitive
    
    • wysokiej kwoty
• ze względu na
  • accusative
    
    • wysoką kwotę

Polish does not have articles like the or a/an.

So blokada karty can mean:

• the block on the card
• a block on the card
• card block

The exact meaning depends on context.

That is completely normal in Polish. Learners often want to know where the went, but in Polish it is simply not expressed with a separate word.

Yes. Polish word order is more flexible than English word order.

The original sentence:

• Blokada karty jest włączona w związku z wysoką kwotą.

You could also say:

• W związku z wysoką kwotą blokada karty jest włączona.

Both are grammatical. The second version puts more emphasis on the reason first: due to the high amount...

Polish word order often changes for emphasis, information structure, or style rather than basic grammar.

In a full standard sentence like this, yes.

• blokada karty jest włączona = the card block is enabled

Polish usually includes jest in the present tense when saying that something is in a certain state.

In some labels, headlines, or very short interface messages, Polish may omit words, but in a normal complete sentence jest is expected.

Yes, very likely. In a banking context, kwota often refers to:

• a transaction amount
• a payment amount
• an amount of money in general

If the sentence appeared in an app or fraud-prevention message, the intended meaning is probably that the block was activated because the amount involved was unusually large.

A more explicit version would be:

• ...w związku z wysoką kwotą transakcji = due to the high transaction amount