The Siemens 3RB1065-1GG0 is an electronic overload relay in the SIRIUS 3RB1 family, rated 55...250 A with Class 10 trip characteristic. It comes with connecting bars for direct mounting on a 3RT106 contactor or can be installed individually. Reset is manual. This is the size S10/S12 variant, so it pairs with the larger frame contactors in that series.
What the ratings mean for fit
The 55...250 A continuous current range covers motor FLA from about 55 A up to 250 A. That puts it on 75–150 kW motors at 400 V, roughly. Class 10 means it trips within 10 seconds at 7.2× set current — standard for standard-duty induction motor starting, not for high-inertia loads that need Class 20 or 30. The electronic sensing gives better repeatability and ambient-temperature immunity than a bimetal relay. Mounting is contactor-mount on a 3RT106 contactor, using the included connecting bars that carry the motor current through the relay's CTs. The same bars let it sit standalone on a DIN rail if you prefer separate mounting. Manual reset means someone has to push the button after a trip — no auto-restart, which is the safer choice for unattended or hazardous-area machinery.
Sourcing and lifecycle
For a BOM freeze or a spares crib, this is a straightforward line item. No successor part to evaluate, no cross-reference to chase. If you're specifying it into a new panel, the current status holds. We source it to order against an RFQ; availability and current pricing are confirmed at quote time.