SIEMENS
SIEMENS 3RU21160KB0 Overload Relay 0.90-1.25 A Trip Class 10 690 V AC 3 Pole Screw Terminals
Thermal overload relay protects motors from 0.90 to 1.25 A with Trip Class 10 at 690 V AC
- Adjustable protection range 0.90 to 1.25 A
- Trip Class 10 limits motor damage during overloads
- 690 V AC rating suits industrial power systems
- Three-pole screw terminals simplify panel wiring
- Auto and manual reset options speed recovery
What it is and who it is for
The SIEMENS 3RU21160KB0 is a thermal overload relay rated for 0.90 A to 1.25 A at up to 690 V AC. It protects three-phase motor circuits in industrial control panels. It suits maintenance engineers and panel builders who need IEC-style protection for small motors in the S00 frame size. Buyers needing higher current ranges or different trip classes must select another model.
Installation and common issues
The relay mounts directly onto a compatible SIRIUS contactor using screw terminals for all connections. Wiring is straightforward for technicians familiar with IEC motor starters. A frequent issue is selecting the wrong current setting range for the actual motor full-load current. Another is forgetting that three thermal elements are required and must match the relay frame.
Capacity and headroom
The adjustable dial covers 0.90 A to 1.25 A with Trip Class 10 response for standard motor starting. It handles continuous operation at the set value and trips reliably on sustained overloads within that band. It runs out of headroom when motor current exceeds 1.25 A or when the application demands a faster or slower trip curve than Class 10 provides.
Highlights
- Adjustable protection range 0.90 to 1.25 A
- Trip Class 10 limits motor damage during overloads
- 690 V AC rating suits industrial power systems
- Three-pole screw terminals simplify panel wiring
- Auto and manual reset options speed recovery
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
How do I verify the 3RU21160KB0 is working correctly after wiring it to the contactor?
Apply load current within the 0.90 A to 1.25 A range; the relay should trip at Trip Class 10 timing and the 1NO/1NC auxiliary contacts must change state to signal the overload.
What comes in the box with the 3RU21160KB0 and what must be sourced separately?
The relay includes the required three thermal units for direct contactor mounting; a matching SIRIUS S00 contactor and control-circuit wiring are not included.
Which current-setting version of the 3RU21160KB0 covers my motor's full-load amperage?
This single version adjusts from 0.90 A minimum to 1.25 A maximum; choose it only if the motor's nameplate current falls inside that window.
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