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Siemens 3RB3143-4UW1
Electronic Overload Relay 12.5...50 A
Product Description
This electronic overload relay operates within a current range of 12.5 to 50 A and is specifically configured for motor protection. It is categorized as size S3 and complies with class 5E to 30E. The relay is designed for stand-alone installation and features a main circuit that utilizes a straight-through transformer.
The auxiliary circuit employs screw terminals, and the reset function can be set to either manual or automatic. This device is equipped with an adjustable release class for enhanced functionality and has an external reset capability. Notably, it includes one auxiliary contact as an opener and one as a shutter.
With a power loss of 0.07 watts per pole, the relay effectively manages energy consumption. It is important to note that this relay is not suitable for mounting onto standard rails. The product type is identified as 3RB3, and it originates from the Czech Republic.
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Offer details
- Offer from:
- Trusted supplier — Germany, member since 2024
- Availability:
- On requestLead time: 3 days
- Warranty:
- Not specified
- Condition:
- New Factory Sealed
Specifications
- Brand
- Siemens
- Type of actuation
- AC
- Release class
- adjustable
- Assembly type
- Miscellaneous
- External reset possible
- Description of product type
- 3RB3
- Number of auxiliary contacts as opener
- 1
Available Offers
(2)| Condition | Availability | Supplier | Warranty | Action | |
|---|---|---|---|---|---|
 | Condition New Factory Sealed | Availability On requestLead time: 3 days | Supplier GermanyTrusted supplier — member since 2024 | Warranty Not specified | |
 | Condition New Factory Sealed | Availability On requestLead time to be confirmed | Supplier ItalyTrusted supplier — member since 2021, 10–19 employees | Warranty 12 months |
ItalyOffer with manufacturer lead time
Directly from the manufacturer - with a confirmed, predictable, and fully transparent delivery time.
Documents
Data Sheet
Datasheet for Siemens 3RB3143-4UW1, including specifications and features.
CAD Models
3D CAD model and technical drawings, ready for your design software.
Product data updated: 07-10-2026
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