einbrechen
to break in
To enter a building forcibly and without permission, usually with the intention of stealing.
Letzte Nacht wurde bei unseren Nachbarn eingebrochen.
Last night, our neighbors' house was broken into.

to break in / collapse
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to break in
To enter a building forcibly and without permission, usually with the intention of stealing.
Letzte Nacht wurde bei unseren Nachbarn eingebrochen.
Last night, our neighbors' house was broken into.

'Einbrechen' (to break in / collapse) is a separable verb. The prefix 'ein-' goes to the end in a main clause. In subordinate clauses or in the infinitive with 'zu', the verb stays together.
Der Täter brach in der Nacht ein.
The perpetrator broke in during the night.
The perfect tense of 'einbrechen' (to break in / collapse) is always formed with the auxiliary verb 'sein'. This is because the verb describes a sudden change of state or place.
Die Diebe sind durch ein Fenster eingebrochen.
The thieves broke in through a window.
To name the target of the break-in, use 'in' with the accusative. To name the affected place or person, use 'bei' with the dative.
Jemand ist in den Supermarkt eingebrochen.
Someone broke into the supermarket.
In relation to times of day or seasons, 'einbrechen' (to set in) is often used figuratively to describe a sudden beginning. Typical combinations are 'die Nacht bricht ein' (night falls) or 'der Winter bricht ein' (winter sets in).
Als der Winter einbrach, fiel der erste Schnee.
When winter set in, the first snow fell.
This meaning is very common in business and finance news. It describes a sudden, sharp decline. Typical subjects are 'die Kurse' (prices/rates), 'der Markt' (the market), or 'der Gewinn' (profit).
Nach der Ankündigung sind die Aktien der Firma eingebrochen.
After the announcement, the company's shares collapsed.
to insert / to begin / to use
'einsetzen' and 'einbrechen' can both describe the beginning of something, especially in nature or the weather. 'einsetzen' is more neutral and simply means that a process begins, for example rain or snowfall. 'einbrechen' sounds more sudden and stronger; it often fits darkness, cold, or a change in the weather. The words can be confused because both can stand for the beginning of an event. If the beginning is calm or normal, 'einsetzen' fits better. If something comes suddenly and noticeably, 'einbrechen' is more precise.

Nach dem langen Wandertag brach plötzlich die Dunkelheit ein.
After the long day of hiking, darkness suddenly set in.
Gegen Mittag setzt leichter Schneefall ein.
Around midday, light snowfall begins.