The Siemens 3RK1301-1BB00-0AA2 is a SIMATIC-branded direct motor starter, designed for controlling and protecting three-phase motors in industrial automation panels. The unit supports both PROFINET and PROFIBUS DP fieldbus protocols, allowing direct integration into a Siemens automation environment without a separate gateway.
The control supply is 24 V DC, with a permissible range of 20.4 to 28.8 V, so it will hold in during a sagging 24 V bus but drops out before the logic supply browns out.
This starter mounts by plugging onto a terminal module, not directly onto a DIN rail — the terminal module carries the main power wiring, and the electronics unit plugs onto it. This allows the electronics to be swapped without disturbing the power wiring. Dimensions are 265 mm high, 45 mm wide, and 120 mm deep. Mounting can be vertical or horizontal. The main energy infeed uses screw-type terminals. Pollution degree is rated 3 at 400 V and 2 at 500 V per IEC 60664, so it's suitable for industrial environments with conductive dust or condensation.
