SIEMENS
SIEMENS 3RU21261KB0 Overload Relay 9-12.5 A 690 V AC
Thermal overload relay protects motors at 9–12.5 A with auto or manual reset and 690 V AC rating
- Thermal overload protection for 9–12.5 A motors
- Trip Class 10 ensures reliable fault response
- 690 V AC rating suits industrial supplies
- Auto and manual reset for flexible recovery
- Direct contactor mounting saves panel space
SIEMENS 3RU21261KB0 Overload Relay 9-12.5 A 690 V AC
The SIEMENS 3RU21261KB0 is a thermal overload relay designed to protect three-phase motors in industrial control panels. It suits maintenance engineers and panel builders who need reliable overcurrent protection for machinery circuits. The unit mounts directly onto compatible SIRIUS S0 contactors for a compact starter assembly. It is supplied new and includes the necessary thermal units for immediate installation.
Trip Class 10 Thermal Protection
This relay operates on Trip Class 10, meaning it trips within ten seconds at 7.2 times the full-load current setting. The adjustable current range spans 9 A to 12.5 A, allowing precise calibration to the motor nameplate rating. The thermal mechanism provides inherent phase-loss sensitivity without requiring external electronics. Select this relay only when the motor full-load current falls within this specific 9 A to 12.5 A window.
Direct Contactor Mounting with Screw Terminals
The relay mounts directly to a SIRIUS S0 frame contactor, eliminating the need for separate DIN-rail space and reducing wiring between components. Power and control connections use screw terminals for secure conductor termination. The integrated auxiliary contacts provide one normally open and one normally closed circuit for status indication or control logic interlocking. Auto and manual reset modes are selectable on the device to match operational procedures.
Highlights
- Thermal overload protection for 9–12.5 A motors
- Trip Class 10 ensures reliable fault response
- 690 V AC rating suits industrial supplies
- Auto and manual reset for flexible recovery
- Direct contactor mounting saves panel space
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
How does the 9 to 12.5 A setting range work once the relay is installed?
The relay trips when motor current exceeds the dial setting within that range, using three thermal elements that heat proportionally to load current.
What does the 690 V AC rating limit in practice?
It defines the maximum circuit voltage the relay can safely monitor; the contactor it mounts to must share the same or higher voltage rating.
What is required to mount this relay on a contactor?
It clips directly onto a SIRIUS S0 frame contactor using the integrated mounting feet; no separate base or adapter is needed.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
