Pennsylvania foreclosure is primarily:

Non-judicial foreclosure (also called foreclosure by advertisement or trustee's sale) is used in states like California, Texas, and Georgia where deeds of trust contain a 'power of sale' clause — Pennsylvania does not use deeds of trust as its primary security instrument and does not permit non-judicial foreclosure for residential mortgages.

Strict foreclosure is a historical remedy, still used in a small number of states like Connecticut and Vermont, where the court simply transfers title directly to the lender without a public sale if the borrower fails to pay the debt within a court-set deadline — Pennsylvania does not use strict foreclosure.

Power of sale is the mechanism that enables non-judicial foreclosure and is typically found as a clause in a deed of trust — since Pennsylvania uses mortgages (not deeds of trust) as its primary security instrument, power of sale foreclosure is not the standard process.