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Siemens SIRIUS 3RU2 Thermal Overload Relay 1 NO/1 NC, 17-22 A Adjustable Current, 22 A Relay Contact Current 3RU2126-4CB0
Specifications
| Country of Origin | Germany |
|---|---|
| Brand | Siemens |
| Length | 87mm |
| Model | 3RU2126-4CB0 |
| Depth | 73mm |
| IP Rating | IP55, IP65 |
| Width | 45mm |
| Mount Type | Direct |
| Series | SIRIUS 3RU2 |
| Power Rating | 11kW |
| Maximum Operating Temperature | 70°C |
| Minimum Operating Temperature | -40°C |
| Terminal type | Screw |
| Standards/Approvals | REACH, IEC, CCC, RoHS, UL, EAC, UKCA, CE, WEEE (2012/19/EU) |
| Pay online using | Or choose to pay later via bank transfer |
| RS Stock No. | 706-1661Brand: SiemensManufacturers Part No.: 3RU2126-4CB0 |
| Contact Voltage | 690V ac |
| Reset Method | Automatic & Manual |
| Normal State Configuration | 1 NO/1 NC |
| Relay Contact Current | 22A |
| Number of Auxiliary Contacts | 2 |
| Pole and Throw Configuration | 3P |
| FLC Motor Rating | 17, 22A |
| Adjustable Current Range | 17 → 22 A |
Key Features
- The relay is designed for current-sensitive protection of loads with normal starting.
- Features automatic and manual reset methods with selector switch and STOP button.
- Mounts directly on surface or DIN-rail with screw or spring-clamp terminal options.
- Supports operation in temperature ranges from -40°C to 70°C with IP55 and IP65 protection ratings.
- Includes test function and switch position indicator for ease of maintenance.
- Impulse voltage resistance is rated up to 6 kV ensuring robust insulation performance.
- Compatible with Sirius Size S0 & S00 contactors for modular assembly.
- Complies with international standards including REACH, IEC, CCC, RoHS, UL, EAC, UKCA, CE, and WEEE.
Product Description
Siemens 3RU2126-4CB0 SIRIUS 3RU2 Thermal Overload Relay is a high-quality 3-pole protective device engineered for reliable motor load protection. It operates within an adjustable current range of 17 to 22 A and has a relay contact current of 22 A, suitable for motors up to 11 kW power rating. Its robust design includes an automatic/manual reset selector switch, a STOP button, and a switch position indicator to facilitate safe and straightforward manual operations and testing.
The device supports screw or spring-clamp connection terminals, enabling flexible installation options for direct mounting on DIN rails or surfaces. It is designed to withstand harsh industrial environments with operating temperatures ranging from -40°C to 70°C and IP55/IP65 ingress protection ratings, making it suitable for diverse industrial, manufacturing, and automation applications.
Featuring impulse voltage resistance of 6 kV and insulation voltage of 690 V AC, the thermal overload relay ensures reliable electrical isolation and protection. It is ideal for use alongside Sirius Size S0 & S00 contactors, providing comprehensive motor control and protection solutions in electrical automation systems.
Certified to international standards such as REACH, IEC, CCC, RoHS, UL, EAC, UKCA, CE, and WEEE directives, this overload relay ensures compliance with strict safety and environmental requirements. Manufactured in Germany, it reflects Siemens' commitment to engineering excellence.
The relay is designed for current-sensitive protection of loads with normal starting. Features automatic and manual reset methods with selector switch and STOP button. Mounts directly on surface or DIN-rail with screw or spring-clamp terminal options.
Supports operation in temperature ranges from -40°C to 70°C with IP55 and IP65 protection ratings. Includes test function and switch position indicator for ease of maintenance. Impulse voltage resistance is rated up to 6 kV ensuring robust insulation performance.
Compatible with Sirius Size S0 & S00 contactors for modular assembly. Complies with international standards including REACH, IEC, CCC, RoHS, UL, EAC, UKCA, CE, and WEEE.
This Thermal Overload Relay is widely used in industrial automation, manufacturing plants, HVAC systems, and motor control panels to ensure motor safety and operational reliability. Explore the Siemens product range at EnvMart for detailed product options and solutions tailored to your industry needs.
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Frequently Asked Questions
The adjustable current range of this thermal overload relay is from 17 to 22 A.
This model can operate at a maximum temperature of 70°C.
It features both automatic and manual reset methods, selectable via a switch.
The relay contact current rating is 22 A.
The dimensions are 87 mm in length, 73 mm in depth, and 45 mm in width.
This unit uses screw terminals for connection.
The IP rating of this relay is IP55 and IP65, providing protection against dust and water.
It is compatible with Sirius Size S0 and S00 contactors for modular assembly.
The impulse voltage resistance is rated up to 6 kV, ensuring robust insulation performance.
This model complies with several international standards including REACH, IEC, CCC, RoHS, UL, EAC, UKCA, CE, and WEEE.
The power rating supported by this relay is up to 11 kW.
It can be mounted directly on surfaces or DIN rails, using either screw or spring-clamp terminals.
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