What this cable release does that the panel-side reset button cannot
The 3RU1900-1C is a cable release with holder for RESET, 600 mm long, from the SIRIUS family. It lets you mount the reset actuator on a cabinet door or remote panel while the overload relay stays inside the enclosure — no need to reach into a live panel to reset a tripped relay.
Compatibility and lifecycle status
This cable release fits the 3RU11, 3RB20, and 3RB21 overload relays in sizes S00, S0, S2, and S3. The description explicitly marks it as a phased-out product. The preferred successors are the 3RU2900-1C or the 3RB3980-0C. These are the environmental limits for the cable assembly itself, not the relay it connects to.