Siemens SIRIUS 3RU2 Thermal Overload Relay 1NO + 1NC, 14 → 20 A F.L.C, 20 A Contact Rating, 7.5 kW, 3P, SIRIUS
- RS Stock No.:
- 706-1664
- Distrelec Article No.:
- 136-23-078
- Mfr. Part No.:
- 3RU2126-4BB0
- Brand:
- Siemens
Subtotal (1 unit)*
£45.89
(exc. VAT)
£55.07
(inc. VAT)
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In Stock
- Plus 16 unit(s) shipping from 03 November 2025
- Plus 5 unit(s) shipping from 03 November 2025
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Units | Per unit |
|---|---|
| 1 + | £45.89 |
*price indicative
- RS Stock No.:
- 706-1664
- Distrelec Article No.:
- 136-23-078
- Mfr. Part No.:
- 3RU2126-4BB0
- Brand:
- Siemens
Specifications
Technical Reference
Legislation and Compliance
Product Details
Find similar products by selecting one or more attributes.
Select all | Attribute | Value |
|---|---|---|
| Brand | Siemens | |
| FLC Motor Rating | 14 → 20 A | |
| Contact Current Rating | 20 A | |
| Range | SIRIUS | |
| Pole Configuration | 3P | |
| Series | SIRIUS 3RU2 | |
| Mounting Style | Direct Contactor | |
| Power Rating | 7.5 kW | |
| Normal State Configuration | 1NO + 1NC | |
| Terminal Type | Screw | |
| Reset Method | Automatic, Manual | |
| Width | 45mm | |
| Number Of Auxiliary Contacts | 2 | |
| Depth | 85mm | |
| Length | 87mm | |
| Minimum Operating Temperature | -40°C | |
| Maximum Operating Temperature | +70°C | |
| Operating Temperature Range | -40 → +70 °C | |
| Contact Voltage Rating | 690 V ac | |
Select all | ||
|---|---|---|
Brand Siemens | ||
FLC Motor Rating 14 → 20 A | ||
Contact Current Rating 20 A | ||
Range SIRIUS | ||
Pole Configuration 3P | ||
Series SIRIUS 3RU2 | ||
Mounting Style Direct Contactor | ||
Power Rating 7.5 kW | ||
Normal State Configuration 1NO + 1NC | ||
Terminal Type Screw | ||
Reset Method Automatic, Manual | ||
Width 45mm | ||
Number Of Auxiliary Contacts 2 | ||
Depth 85mm | ||
Length 87mm | ||
Minimum Operating Temperature -40°C | ||
Maximum Operating Temperature +70°C | ||
Operating Temperature Range -40 → +70 °C | ||
Contact Voltage Rating 690 V ac | ||
- Switching Devices for Load Feeders
- Datasheet_3RU2126-4BB0
- Sirius Innovation Accessory Guide
- Sirius Innovation Catalogue
- Sirius Innovations Switching Devices
- Solutions for frequent switching or soft starting
- Basic Information
- Siemens Sirius Migration
- Environmental Product Declaration
- Manual - 3RU2 Series
- Instruction Sheet - 3RU2116/3RU2126 Series
- COO (Country of Origin):
- DE
Siemens SIRIUS 3RU2 Series Thermal Overload Relay, 20A Contact Current Rating, 7.5kW Power Rating - 3RU2126-4BB0
This thermal overload relay plays a vital role in protecting electrical motors, specifically designed for those operating within a current range of 14 to 20 A. Featuring both automatic and manual reset functions, it helps prevent damage caused by overload situations. Its durable design allows for easy installation directly onto contactors, making it suitable for various automation and electrical machinery applications.
Features & Benefits
• Provides continuous protection for 3-phase motors
• Automatic reset feature enhances operational convenience
• Integrated auxiliary contacts for additional functionality
• Compact dimensions support space-efficient installations
• Automatic reset feature enhances operational convenience
• Integrated auxiliary contacts for additional functionality
• Compact dimensions support space-efficient installations
Applications
• Applicable with industrial machinery to ensure operational safety
• Can be integrated into commercial electrical systems
• Commonly used in manufacturing environments for motor protection
• Can be integrated into commercial electrical systems
• Commonly used in manufacturing environments for motor protection
What is the installation process for this device?
The device can be installed directly on contactors using screw terminals, ensuring a straightforward setup.
How does the automatic reset feature work?
Upon a fault occurrence, the device disconnects the motor and automatically reconnects once the fault is resolved.
Is this suitable for high current applications?
Yes, it is rated for safe operation with currents up to 20A.
Can it operate in high-temperature environments?
Yes, it performs well within a temperature range of -40 to +70°C.