The Omron E2E-S04SR8-CJ-B1 0.3M is a shielded M8-threaded proximity sensor in a 4mm diameter body. It switches on ferrous metals at 0.8mm, outputting a PNP normally open signal over a 0.3m cable terminated with a 3-pin M8 connector. That 0.8mm range is tight—sized for detecting small targets like screw heads or cam lobes in confined spaces.
Not interchangeable with E2C-X1R5AH
A common cross-shop candidate is the E2C-X1R5AH, but it is a different architecture: a separate amplifier unit with a heat-resistant sensor head. That system senses 1.5mm and requires an external amplifier like the E2C-AM4A. The E2E-S04SR8-CJ-B1 0.3M is self-contained DC 3-wire with the signal and M8 connector on the cable—no amplifier needed. They share a threaded housing but the wiring, output type, and sensing principle differ; you cannot drop one in for the other without rewiring and re-commissioning.