The Siemens 3RB1065-1KG0 is an electronic overload relay rated 200...540 A, Class 10 trip class, in the S10/S12 frame size. It ships with connecting bars for direct mounting on a 3RT106 contactor or can be installed individually. Reset is manual.
What the ratings mean for fit
The 200...540 A range covers large motor loads. Class 10 trip disconnects the motor before overheating on a locked-rotor condition.
Lifecycle and sourcing reality
Lifecycle stage is listed as current — meaning Siemens still manufactures this order code as a standard catalog item. No phase-out notice or last-time-buy date is available.
Where it goes in the panel
Mounts directly onto a 3RT106 contactor using the supplied connecting bars — no separate wiring between contactor and overload. For standalone installation, the relay can be panel-mounted with the same footprint. The S10/S12 frame is DIN-rail compatible, so it integrates into standard enclosure layouts.