SIEMENS
SIEMENS 3RU21264CB0 Overload Relay 17-22 A 690 V AC Trip Class 10
Thermal overload relay protects three-phase motors with a 17–22 A adjustable range, Trip Class 10 response, and 690 V AC rating
- Thermal overload protection for 17–22 A motor circuits
- Trip Class 10 response limits nuisance tripping under start-up loads
- 690 V AC rating suits industrial three-phase supplies
- Auto and manual reset modes give flexible restart options
- Direct contactor mounting with screw terminals speeds panel assembly
SIEMENS 3RU21264CB0 Overload Relay
The SIEMENS 3RU21264CB0 is a thermal overload relay designed for three-phase motor protection. It operates within a current range of 17 A to 22 A and carries a maximum voltage rating of 690 V AC. The unit features Trip Class 10 response and mounts directly to compatible SIRIUS contactors using screw terminals.
Suited for industrial motor starters needing
This relay suits panels using SIRIUS Series S0 contactors where 1NO/1NC auxiliary contacts are required. It is not for applications needing a different current range, a higher trip class, or a frame size other than S0. Buyers needing electronic overload functions or NEMA-rated dimensions should look at alternative designs.
Direct contactor mounting
Installation involves securing the relay directly onto a matching SIRIUS contactor and tightening the screw terminals for main and auxiliary circuits. The auto and manual reset options are selectable on the unit. A common issue is mismatching the frame size or current setting to the contactor, which prevents proper fit and protection.
Highlights
- Thermal overload protection for 17–22 A motor circuits
- Trip Class 10 response limits nuisance tripping under start-up loads
- 690 V AC rating suits industrial three-phase supplies
- Auto and manual reset modes give flexible restart options
- Direct contactor mounting with screw terminals speeds panel assembly
Specifications
| Brand | SIEMENS |
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Questions about this item
What contactor frame size must I already have to mount this 3RU21264CB0 overload relay directly?
The relay mounts directly to a SIRIUS series contactor with frame size S0 using the integrated mounting style.
Will the relay's 17 A to 22 A setting range protect a motor that previously ran on a lower-range thermal unit?
Yes, if the motor's full-load current falls between 17 A and 22 A; the three included thermal units cover that range at trip class 10.
How can I verify the relay is operating correctly after wiring it to a 690 V AC three-phase circuit?
Confirm the auto or manual reset function clears a trip, and measure that the 1NO/1NC auxiliary contacts change state when the overload threshold is reached.
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