What it is and where it sits
The Omron E3NXFA412MOMS is a fibre optic amplifier unit from the E3NX-FA series, built as the head-end that drives a remote fibre-optic sensing probe and converts the returned light level into a switching signal. It is sized for high-density DIN-rail cabinets at 10 mm wide, 33.5 mm tall, and 71.8 mm long, which is the footprint integrators plan around when populating amplifier banks.
Electrical envelope that drives fit
Response time is 30 us, so the amplifier can resolve high-speed events on packaging and assembly lines where a slower diffuse sensor would miss the pulse.
Optical switching and wiring
Light-ON / Dark-ON modes are user-selectable on the unit, which means one part number covers both presence-detect and absence-detect logic without re-ordering a different amplifier. The LED red source pairs with the standard E3NX-FA fibre-optic cables and is the right choice for red-light fibre probes commonly stocked for colour-mark and small-part detection. Termination is a 2 m cable pigtail rather than a connector, which means the wireman lands conductors directly at the amplifier block — plan strain relief and label space inside the cabinet door accordingly.
Thermal envelope and cabinet layout
Operating temperature spans -25 °C to 55 °C, which keeps the amplifier inside unheated cabinets, cold-storage lines, and most outdoor enclosures without derating.