SIEMENS
SIEMENS 3RU21161EB0 Overload Relay 2.8–4 A 690 V AC
Thermal overload relay protects motors at 2.8–4 A with auto or manual reset and 1NO/1NC auxiliary contacts
- Thermal protection for motors up to 4 A
- Trip Class 10 ensures reliable overload response
- Auto and manual reset options simplify maintenance
- Direct contactor mounting saves panel space
- Screw terminals give secure wiring connections
SIEMENS 3RU21161EB0 Overload Relay
This SIEMENS overload relay protects three-phase motors by monitoring current between 2.8 A and 4 A at up to 690 V AC. It mounts directly onto a compatible SIRIUS S00 contactor using screw terminals and includes the required thermal units. The device offers both automatic and manual reset options for flexible recovery after a trip event.
Suits panels using SIRIUS S00 contactors
Installers needing IEC-style thermal overload protection with a Trip Class 10 response will find this relay a direct fit. It is not intended for applications requiring electronic overload functions, different current ranges, or NEMA-rated starters. Buyers who need integrated communication modules or remote monitoring capabilities should look at other product types.
Fits onto SIRIUS S00 contactor frame
The relay locks onto the contactor without extra mounting hardware, freeing DIN-rail space inside the enclosure. Screw-terminal connections accept standard control wiring for the 1NO/1NC auxiliary contacts. It requires a matching three-pole contactor and three thermal elements, which are supplied with the unit.
Highlights
- Thermal protection for motors up to 4 A
- Trip Class 10 ensures reliable overload response
- Auto and manual reset options simplify maintenance
- Direct contactor mounting saves panel space
- Screw terminals give secure wiring connections
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
What contactor frame size and series must I already have to mount this overload relay directly?
It mounts directly to a SIRIUS series contactor with frame size S00.
Will the relay coordinate with an existing motor circuit rated up to 690 V AC and a Trip Class 10 requirement?
Yes, the relay is rated for 690 V AC maximum and operates at Trip Class 10.
How can I verify the relay is protecting the motor correctly after wiring the three thermal units?
The relay will trip automatically or manually when motor current exceeds the 2.8–4 A setting range.
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