What this cable is and where it fits
The Siemens 6GT2891-0PH50 is a PUR-jacketed, highly flexible 6-wire cable purpose-built for connecting a 24 V power supply to SIMATIC RF600 series readers — specifically the RF61XR, RF650R, RF68XR, and MV440 models. It terminates in an M12 male 4-pin straight connector on one end and an M12 female 8-pin straight connector on the other, so it plugs directly between the reader and a power supply unit like the 6GT2898-0AA or 6GT2898-0AC. Rated for 300 V maximum operating voltage with a UL/ETL listing at that rating and a CM (Communications) cable classification, it's suitable for North American installations where a listed power interconnect is required.
Key ratings and what they mean for the line
The 5 m wire length gives enough reach to locate the power supply unit away from the reader head — useful when mounting the reader on a moving gantry or in a tight cell where the supply needs to sit in a separate enclosure. The cable is rated grease-resistant and mineral-oil-resistant, so it holds up in machine-tool or press-shop environments where coolant mist and lubricant splash are routine. It's also resistant to UV radiation, which matters if the reader is mounted near a window or in an area with direct sun exposure. Flame behavior meets IEC 60332-1-4, so the cable won't propagate a flame along a cable tray — a standard requirement for control panels and machine wiring in most European and North American specs. The braided shield of tin-plated copper wires keeps electrical noise from coupling into the 24 V supply line, which is critical when the cable runs alongside high-current motor or drive cables in a cabinet.
Mechanical durability for continuous flex applications
Rated for 3 million bending cycles at a 75 mm bend radius, this cable is built for continuous-flex applications like cable carriers or robot dress packs. The minimum single-bend radius is 21.6 mm, and the multiple-bend minimum is 43 mm — so it can handle tight routing in a junction box without damaging the conductors. Conductor class 5 (fine-stranded) and a PVC wire insulation with color-coded cores per DIN 47100 make termination straightforward in a panel or junction box.