SIEMENS
SIEMENS 3RU21164AB0 Overload Relay 11-16 A 690 V AC Trip Class 10 1NO/1NC
Thermal overload relay protects motors at 11–16 A, 690 V AC with trip class 10 and 1NO/1NC contacts
- Protects motors from overload with 11–16 A thermal range
- Trip Class 10 ensures fast response to excessive current
- 690 V AC rating suits industrial three-phase supplies
- 1NO/1NC auxiliary contacts give clear fault signalling
- Direct contactor mounting with screw terminals simplifies installation
Product Identity
The SIEMENS 3RU21164AB0 is a thermal overload relay rated for 11 A to 16 A at 690 V AC. It suits industrial control panels that need IEC-style motor protection with a Trip Class 10 response. The unit includes three thermal units and mounts directly to a compatible SIRIUS S00 contactor.
Installation Notes
Screw terminals accept standard wiring tools for straightforward connection. The relay offers both auto and manual reset modes, selectable on the device. Direct contactor mounting simplifies assembly, but the installer must verify the contactor frame matches the S00 size. Mismatched frames or incorrect thermal unit count will prevent proper fit and protection.
Practical Limits
The fixed 11 A to 16 A adjustment range cannot cover motors outside this current window. Trip Class 10 defines a specific time-current curve that may not suit high-inertia loads requiring longer acceleration. The 690 V AC rating limits use to systems within that voltage. Three-pole configuration only protects three-phase circuits.
Highlights
- Protects motors from overload with 11–16 A thermal range
- Trip Class 10 ensures fast response to excessive current
- 690 V AC rating suits industrial three-phase supplies
- 1NO/1NC auxiliary contacts give clear fault signalling
- Direct contactor mounting with screw terminals simplifies installation
Specifications
| Brand | SIEMENS |
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Questions about this item
How can I verify the 3RU21164AB0 overload relay is operating correctly after wiring it to a contactor?
Apply a test current between 11 A and 16 A; the relay should trip within Trip Class 10 limits and the 1NO/1NC auxiliary contacts will change state to signal the trip.
What comes in the box with the SIEMENS 3RU21164AB0 and what must be purchased separately?
The relay includes the thermal units and screw terminals for direct contactor mounting; a compatible SIRIUS series contactor of frame size S00 is not included and must be bought separately.
Which current setting should I select on the 11-16 A dial for my motor load?
Set the adjustment dial to the motor's full-load amperage; the relay accommodates any value from 11 A minimum to 16 A maximum at 690 V AC.
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