Sorry, equivalent of what? If you mean the high explosive, it's basically unchanged from vanilla, except for generic changes on all explosives (like the overkill).
Something like what Jimboman described for Piratez. I haven't played the latest version yet, thus I cannot comment.
As per
this article, breaching in real life operations can be done in mainly four ways: 1. Mechanical (a hammer or pickaxe); 2. Ballistic (shot it with something); 3. Thermal (cut it with a flame, like the plasma cutter); and 4. Explosives (anything with a bang).
On the latter is where this post is all about. It would be like an explosive, cannot be thrown (to explode), small size, and the explosion is very small in range. In XCF: Dynamite and High Explosive are too powerful in the sense they damage many other tiles. In RL they would be classified as large demolition charges. Small demolition charges IRL are designed to make holes into doors, walls with minimal damage, usually contact explosives.
In OXCE, as far as I know, explosions affect all tiles around the explosion area, like an circle (or sphere), not in a cone shape, like these concentrated contact charges.
Maybe I'll test something (maybe based on what Dioxine's Piratez uses) and post it here for peer review.