The Siemens 3RK1902-1GB50 is an M12 angled B-coded socket with an open cable end, designed for fieldbus and sensor/actuator connections in industrial automation panels. It carries a 5-meter polyurethane (PUR) cable sheath, rated for high-flex applications with 5,000,000 bending cycles, making it suitable for cable tracks or moving machine parts. The 2-pole, 2-core configuration with a shielding braid of tinned copper wire handles signal integrity up to 4 MHz with an attenuation of 26 dB/km at that frequency. Each pin is rated for a maximum ampacity of 4 A, and the connector is approved under UL, CSA, and IEC standards, with RoHS conformity confirmed. The M12 x 1 thread locking ensures a vibration-resistant connection in panel or machine-mount applications.
Cable and Signal Characteristics
The cable carries the designation BUS: 1P24-19/2,55 02YS(ST)C11Y, with an inner conductor diameter of 0.64 mm and an overall cable diameter of 7.8 mm. The wire insulation is polyethylene, and the data wire insulation colors are red and green. Impedance values are specified for the switching frequencies: 300 Ω at 9.6 kHz, 20 Ω at 38.4 kHz, and 15 Ω across the 3 MHz to 20 MHz range. Attenuation is rated at 3 dB/km maximum at 9.6 kHz, 5 dB/km at 38.4 kHz, 26 dB/km at 4 MHz, and 52 dB/km at 16 MHz. The shield design uses a tinned copper braid, and the strain relief is molded into the angled outlet.