What it is and what it does
The Siemens SIRIUS 3RT1955-5QP31 is a changeover operating mechanism designed for use with contactors 3RT105 and 3RT145. It accepts a control supply voltage of AC or DC, rated at 200 V DC and 277 V DC, and 277 V at both 50 Hz and 60 Hz. The mechanism is electronic and includes AS-Interface and RLT signal capability.
Integration context
As a changeover operating mechanism for the SIRIUS contactor family, the 3RT1955-5QP31 mounts directly onto the 3RT105 or 3RT145 contactor frame. The electronic design with AS-Interface integration means it connects to an AS-i network for control and status feedback, including the RLT (remote local trip) signal — useful for distributed I/O architectures in a control panel.