What it is and where it fits
The E3JK-TR12-C 2M is a through-beam photoelectric sensor from Omron's E3JK series, a built-in power supply design that handles the AC/DC line voltage directly — no separate amplifier or external controller needed. It's a mature product line, meaning it's been in the field long enough that spares are well understood and the form factor is stable across panel layouts. The 2-meter pre-wired cable simplifies replacement on existing brackets: cut the old sensor loose, land the wires, and you're back in service.
How it compares to the E3Z-T61-L DC12-24
The closest peer in the catalog is the E3Z-T61-L DC12-24, also a through-beam photoelectric sensor. The E3JK-TR12-C 2M runs on a built-in power supply (line voltage), while the E3Z-T61-L DC12-24 requires a 12–24 VDC external supply. If your panel already has a 24 VDC bus, the E3Z is a drop-in alternative; if you're replacing a sensor on an older AC-powered line, the E3JK keeps the wiring simple without adding a DC supply. The E3Z uses infrared light and claims 15 m sensing distance; the E3JK's sensing distance is not listed here, but through-beam pairs in this class typically cover 10–20 m. Mounting footprint differs — verify bracket hole spacing before swapping.