Relé térmico Siemens 3RU2146-4KB0 SIRIUS 57-75A classe 10 para proteção de motores trifásicos

Siemens 3RU2146-4KB0 – SIRIUS 57–75A Class 10 Thermal Overload Relay (Size S3)

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Siemens 3RU2146-4KB0 – SIRIUS 57–75A Class 10 Thermal Overload Relay (Size S3)

Overview

The Siemens 3RU2146-4KB0 is a thermal overload relay from the SIRIUS line, developed for the reliable protection of three-phase motors in industrial applications. With a current adjustment range between 57 A and 75 A and trip class 10 , this relay acts quickly in overload, current imbalance or phase failure conditions, preserving the integrity of the motor and the electrical system.

Designed in S3 size , the 3RU2146-4KB0 allows direct mounting on Siemens contactors of the 3RT104 and 3RT203 series , ensuring simple, compact and safe integration into control panels. The device uses a bimetallic mechanism and features phase loss sensitivity , as well as manual or automatic reset , selectable on the equipment itself.

Main Features

Product Line / Brand: Siemens SIRIUS
Type: Thermal Overload Relay (TOR)
Function: Protection against overload, imbalance, and phase failure.
Current adjustment range: 57 A to 75 A
Firing class: Class 10
Number of poles: 3 poles (3P)
Construction size: S3
Reset: Manual or automatic , selectable.
Auxiliary contacts: 1 NO + 1 NC
Sensitivity to phase loss: Yes
Robust construction for continuous industrial use.

Technical Specifications

Manufacturer Code: 3RU2146-4KB0
Protection technology: Bimetallic
Rated operating voltage: up to 690 V AC
Connection type: Screw (main circuit and control)
Mounting type:
- Direct connection to contactor (e.g., 3RT104 / 3RT203 )
- Individual assembly with adapter (optional)
Motor protection class: Class 10 (rapid firing)

Typical Applications

Protection of three-phase induction motors
Industrial automation panels
Electric motor drive systems
Pumps, fans and compressors
Continuous industrial machines and processes

Why choose the Siemens 3RU2146-4KB0?

Complete protection against thermal overload and phase failure.
High reliability for medium and high current motors.
Seamless integration with Siemens SIRIUS contactors.
Precise adjustment of the current according to the motor used.
Industrial construction with a long service life.

Availability

The Siemens 3RU2146-4KB0 thermal relay is available for immediate delivery, with fast and secure shipping.

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PROIND ELETRONICA is an independent company specializing in the sale of industrial automation equipment, parts, and components. We are not authorized distributors, partners, official representatives, or affiliates of any manufacturers mentioned on this website. All trade names, trademarks, and logos mentioned belong exclusively to their respective owners and are used only for product identification, technical reference, or compatibility purposes. PROIND ELETRONICA has no association, commercial ties, sponsorship, or endorsement from ABB, Siemens, Schneider Electric, Rockwell Automation, B&R, or any other brands mentioned on this website.

Description

Siemens 3RU2146-4KB0 – SIRIUS 57–75A Class 10 Thermal Overload Relay (Size S3)

Overview

Main Features

Product Line / Brand: Siemens SIRIUS
Type: Thermal Overload Relay (TOR)
Function: Protection against overload, imbalance, and phase failure.
Current adjustment range: 57 A to 75 A
Firing class: Class 10
Number of poles: 3 poles (3P)
Construction size: S3
Reset: Manual or automatic , selectable.
Auxiliary contacts: 1 NO + 1 NC
Sensitivity to phase loss: Yes
Robust construction for continuous industrial use.

Technical Specifications

Manufacturer Code: 3RU2146-4KB0
Protection technology: Bimetallic
Rated operating voltage: up to 690 V AC
Connection type: Screw (main circuit and control)
Mounting type:
- Direct connection to contactor (e.g., 3RT104 / 3RT203 )
- Individual assembly with adapter (optional)
Motor protection class: Class 10 (rapid firing)