What this cable is — and what it connects
The 3RK1902-1NB50: This is a pre-assembled M12 bus drop cable, angled on both ends — one M12 plug, one M12 socket, both with a right-angle outlet. The 5 m length with a 7.8 mm cable diameter is a standard Siemens fieldbus interconnect for ET 200 or SIMATIC remote I/O stations where the cable runs along a panel wall or into a tight enclosure corner. Two cores with red/green insulation carry the bus signal; the shield is a tinned copper braid. The M12 x 1 thread lock keeps the connection tight under vibration — no secondary latch needed.
Rated for the panel, not the bench
Pollution degree 3 means this cable is rated for conductive dust and occasional condensation — standard for industrial control cabinets, not clean-room or dry indoor-only use. The polyurethane jacket and thermoplastic polyurethane enclosure resist mineral oil and grease, though Siemens flags those as conditional — verify against your specific coolant or lubricant before committing the BOM line. Rated 4 A per pin max at 60 V AC/DC. That ampacity covers bus-powered sensors or a small auxiliary supply, but not a motor or heater circuit — keep it on signal duty. The cable is rated for 5,000,000 bending cycles — a high-flex rating for cable tracks or robot dress packs. The moulded strain relief handles the flex without pulling on the M12 contacts.
Approvals and compliance — what the certs mean
UL and CSA approved — accepted for North American panel builds without a separate evaluation. IEC approval covers the CE-mark jurisdictions. RoHS compliant. CCC and cUL are listed as No — if your shipment destination is China or you need a cUL mark for a Canadian job, this specific order code does not carry those marks. The cable itself may be functionally identical, but the cert stamp is absent.