The Siemens 3RK1902-0AP00 is a mounting plate within the SIRIUS compact starter family, designed specifically to hold and route the shaped cable for AS-i (Actuator-Sensor Interface) and auxiliary power connections. This is a mechanical accessory, not an active electronic component — its job is cable management and strain relief within the starter assembly, keeping the communication and power wiring organized and secured against vibration in the panel.
What It Does in the System
In a SIRIUS compact starter installation, this mounting plate serves as the physical interface between the starter and the cable harness. It holds the shaped cable for AS-i — the flat, keyed cable that carries both power and data for the AS-i bus — and the separate auxiliary power cable. This keeps the wiring from pulling on the connector pins and maintains the bend radius specified for AS-i cable, which is critical for signal integrity on a bus that can run at up to 100 m segment lengths. The plate mounts directly to the starter housing, so it adds no extra DIN-rail width.