Siemens
Siemens 3RU1126-4BB0 Thermal Overload Relay
In stock, ready to ship
Manufacturer: Siemens
Product No.: 3RU1126-4BB0
Product Type: Thermal Overload Relay
Product Origin: Germany
Payment: T/T
Weight: 4780g
Shipping port: Xiamen
Warranty: 12 months
Yes, we provide a 30-day money-back guarantee for all purchases.
Yes, all items come with a 12-month warranty from the date of shipment.
The Siemens 3RU1126-4BB0 is a thermal overload relay from the Siemens SIRIUS range. It is designed to protect electric motors from overheating caused by overload conditions or phase failure.
Technical Specifications
| Feature | Details |
|---|---|
| Product Brand | Siemens SIRIUS |
| Relay Size | S0 (compatible with S0 contactors) |
| Current Setting Range | 14 A – 20 A |
| Mounting Type | Direct mounting onto a contactor |
| Trip Class | Class 10 (trips within 10 seconds at 6× rated current) |
| Auxiliary Contacts | 1 NO (Normally Open) + 1 NC (Normally Closed) |
Key Features & Functionality
Phase Failure Protection
The relay trips when one phase of the three-phase supply is lost, preventing potential motor damage.
Manual / Automatic Reset
Users can choose between:
-
Manual reset – requires a physical reset after tripping
-
Automatic reset – the relay resets automatically once it cools down
Ambient Temperature Compensation
Designed to operate reliably in ambient temperatures from −20 °C to +60 °C, minimizing the risk of false trips.
Stop / Test Button
Allows manual testing of the auxiliary contacts and provides a convenient way to stop the motor during maintenance checks.