SIEMENS
SIEMENS 3RU21161BB0 Overload Relay 1.4-2 A 690 V AC
Thermal overload relay protects motors from 1.4 A to 2 A at 690 V AC with automatic or manual reset
- Thermal overload protection for motors up to 2 A
- Auto and manual reset options suit maintenance needs
- Direct contactor mounting saves panel space and wiring time
- 1NO/1NC auxiliary contacts enable remote status signalling
- Trip Class 10 response limits damage during sustained overcurrent
Industrial Motor Protection
The SIEMENS 3RU21161BB0 is a thermal overload relay designed for three-phase motor circuits up to 690 V AC. It mounts directly onto compatible SIRIUS contactors in frame size S00, providing adjustable protection between 1.4 A and 2 A. The unit includes integrated thermal units and offers both automatic and manual reset options for flexible recovery after a trip event.
Installers Using SIRIUS S00 Contactors
This relay suits panels built around the SIRIUS S00 frame where a Trip Class 10 response matches the motor starting profile. It is not suited for applications requiring a different trip class, a current range outside 1.4 A to 2 A, or a voltage rating above 690 V AC. Builders using other contactor series or frame sizes should verify mounting compatibility before specifying this part.
Direct Contactor Mounting with Screw Terminals
Direct mounting eliminates separate DIN-rail hardware and reduces wiring time between contactor and relay. Screw terminals accept standard ferrules or bare conductors for secure power and auxiliary connections. The included thermal units mean no additional selection or installation step is required, and the 1NO/1NC auxiliary contacts integrate directly into control circuits for status signalling or interlocking.
Highlights
- Thermal overload protection for motors up to 2 A
- Auto and manual reset options suit maintenance needs
- Direct contactor mounting saves panel space and wiring time
- 1NO/1NC auxiliary contacts enable remote status signalling
- Trip Class 10 response limits damage during sustained overcurrent
Specifications
| Brand | SIEMENS |
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Questions about this item
What contactor frame size must I already have to mount this relay directly?
The relay mounts directly to a SIRIUS series contactor with frame size S00.
Will the relay protect a motor circuit running at 690 V AC with a 1.4 A minimum setting?
Yes, the relay covers 1.4 A to 2 A and is rated for 690 V AC maximum voltage.
How can I confirm the relay has tripped after an overload event?
Check the 1NO/1NC auxiliary contacts; the normally closed contact opens and the normally open contact closes on trip.
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