The 3RK1903-1AB00 is a TM-X15 S27-01 terminal module that connects to a PM-X connection module in a SIRIUS 3RK1 motor-starter or safety-system cabinet. It is the field-wiring interface between the power/control module and the motor or actuator cables — the point where the panel builder lands the outgoing conductors.
Substance prohibitance date of 05/01/2012 indicates compliance with RoHS and similar restricted-substance directives as of that date — relevant for EU and UKCA declarations on new installations.
This terminal module is the wiring drop for a PM-X connection module — the part that bridges the SIRIUS motor starter or safety relay to the field cables. No special tooling beyond a screwdriver is needed for the spring-cage or screw terminals (depending on the specific PM-X variant).