What it is and where it lands
The 6GT2891-4FH50 is a pre-assembled SIMATIC RF MV plug-in cable — 5 m, six-core, L-YC11Y construction with a braided shield of tin-plated copper wires, terminated at both ends with M12 8-pin straight connectors (male on one end, female on the other). It connects an ASM 456, RF160C, RF170C, or RF18XC communication module to a reader, or serves as an extension cable between those modules and an RF / MV / MOBY PUR reader. The cable is rated for continuous flexing (3 million bending cycles at 75 mm radius) and carries a 300 V maximum rating on the conductors.
What the ratings mean for fit
The 300 V maximum is the conductor-to-conductor / conductor-to-shield voltage rating of the cable itself, not a system voltage — it comfortably covers 24 VDC reader supplies and 120/240 VAC signal circuits common in RFID installations. The 5 m length is fixed; no field-cut option on this pre-assembled variant. The trailing rating and 3 million bending cycles mean it survives continuous flexing on a moving gantry or robot arm — not just a static cable-tray run. The braided shield gives good EMI rejection for the RS-485 / HF signals these readers typically use. Flame resistance per IEC 60332-1-2 means it passes vertical-tray flame spread — required for UL CM listing on the cable without plugs.
Deployment context
This cable is used inside control cabinets and on machine frames where an RFID reader is mounted remotely from its communication module. The M12 straight connectors require about 30 mm of clearance behind the panel for the coupling nut. The trailing rating means it can be routed through a cable carrier (e-chain) with a minimum bend radius of 75 mm for continuous flex, or 21.6 mm for a single static bend. The jacket is black PVC, silicone-free, grease- and mineral-oil-resistant — suitable for machine-tool or automotive assembly environments where cutting fluids are present.