What the cable release does in a panel
The 3RU5900-1C is a remote reset cable for Siemens SIRIUS overload relays — it lets you mount the reset actuator on a panel door or enclosure cover while the relay itself sits deeper in the cabinet on a DIN rail. The 600 mm cable length gives enough reach to route from the relay face to a front-panel reset button without a splice, keeping the door wiring clean.
Relay compatibility and sizing
This cable release fits SIRIUS overload relay frames S00, S0, S2, and S3 — that covers the 3RU11, 3RB10, 3RB20, and 3RB21 series across the full current range those sizes serve. The holder is designed for the RESET function, so it works with both manual and auto-reset modes on the relay; the cable transmits the mechanical stroke from the door actuator to the relay's reset plunger.
Environmental limits for storage and operation
During operation the cable release is rated for -20 to +70 °C, matching the typical enclosure ambient inside a motor control centre.