SIEMENS
SIEMENS 3RU21161KB0 Overload Relay 9-12.5A 690V AC Trip Class 10
Thermal overload relay protects motors at 9–12.5 A with 690 V AC rating and Class 10 trip
- Thermal protection up to 12.5 A trip class 10
- Dual auxiliary contacts 1NO/1NC for status signaling
- Direct contactor mounting with screw terminals
- Auto and manual reset modes included
- Rated 690 V AC for industrial circuits
Overload Relay 9-12.5 A
The SIEMENS 3RU21161KB0 is a thermal overload relay designed for motor protection in industrial control circuits. It suits maintenance engineers and panel builders wiring three-phase starters up to 690 V AC.
Current Setting Range 9 A to 12.5 A
The adjustable dial covers 9 A minimum to 12.5 A maximum, matching Trip Class 10 response for standard motor acceleration. Motors drawing sustained current above 12.5 A exceed the relay’s calibration limit and will nuisance-trip.
Direct Contactor Mounting Screw Terminals
The unit mounts directly to a compatible SIRIUS S00 contactor using screw terminals for power and auxiliary 1NO/1NC contacts. Installers without that contactor frame or preferring DIN-rail mounting must source separate adapters.
Highlights
- Thermal protection up to 12.5 A trip class 10
- Dual auxiliary contacts 1NO/1NC for status signaling
- Direct contactor mounting with screw terminals
- Auto and manual reset modes included
- Rated 690 V AC for industrial circuits
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
Will the 3RU21161KB0 mount directly to an existing SIRIUS S00 contactor without extra brackets?
Yes, the relay uses direct-to-contactor mounting and is compatible with the SIRIUS series frame size S00, so it fits existing S00 contactors without additional hardware.
How can I verify the overload relay is operating correctly after installation?
Set the current dial between 9 A and 12.5 A, apply load, and confirm the relay trips at the configured value with Trip Class 10 timing; the 1NO/1NC auxiliary contacts will change state to signal the trip.
Does the package include the three thermal units required for three-pole protection?
Yes, the relay includes thermal units, and the specification calls for three required thermals matching the three poles.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
